Also, keep an eye out for the A/C drain hose. The seal lip should be pointed toward the pressure source (inside the bore). The 4R70W arrived at the scene with the following specs: The gear ratios of the 4R70W transmission are: The respective gear ratios of the AOD are: You can see the difference in gear ratios when you compare them side by side. What axle gear ratio are you ordering in an F-350 with a 7.3L gas engine? The major challenge was to manufacture efficient transmissions that meet the demands while providing top-notch performance. Yet another issue could be the low-reverse one-way clutch. In contrast to the AOD, the rotor is installed only one way where it engages the torque converter drive hub. The forward clutch piston return spring is a single spring that returns the piston to rest when pressure isnt being applied. Install the low-reverse servo cover and snap ring. Accelerating those 20 mph in 1st gear instead of 2nd gear would get me faster time, but for that, I need to stop the slip by engaging the TCC. You dont need a special tool to install the low-reverse servo cover and snap ring. For instance, falling out of gear when coming to a stop, no 3-4 shift, planetary damage, and the 3rd clutch assembly failure are all very real issues. Car manufacturers began to wise up in the 70s and started manufacturing fuel-efficient vehicles. The forward clutch piston installs using a Lip Wizard. This is the intermediate one-way clutch installed. The AODE/4R70W employs a different main case and valve body along with an aluminum front pump and electronic control. There is only one way to install the front pump. Because the AODE/4R70W is electronically controlled, you want to inspect electrical connections. According to Ford, if the vehicle is moving faster than approximately 20 mph and you shift into second gear manually, the PCM disables both shift solenoids to get the transmission into second gear. Privacy Statement - However, for the sake of longevity, replace yours. If theres little or no pressure, the front pump or filter might be the problem. Is the noise or vibration in rhythm with the engine, driveline, or wheels? Examine the check ball valves for freedom of movement. Was pulling my trailer the other day unloaded without any problems. Early 1999 4x4 w/ 215,000 and auto (4R100). Then re-torque them for a final check. This cookie is set by GDPR Cookie Consent plugin. A good rule to remember is that AODEs are standard ratio with 2.40:1/1.47:1 gearsets, while the AOD and 4R70W are wide ratio with 2.84:1/1.55:1 gearsets. Does it happen in one gear range or in all? With this sequence of events, pressure goes to the forward clutch pack through the orifice control valve and the 2-3 backout valve. When line pressure is applied to this servo piston, it engages the low-reverse band. It is recommended that you lube the thrust bearing with transmission assembly lube for a good wet start-up. What gives? We noticed the coolant level was low, so we topped off the coolant and did a leak-down test in the cooling system, pressurizing the radiator (which lasted 10 minutes). An AODE/4R70W not going into gear could mean problems with the forward clutch piston sealing and check balls. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Written by George Reid and Posted with Permission of CarTechBooks. Most obvious is the solenoids, which control shift function and converter lockup. Both transmissions are significantly improved versions of the first 4-speed AOD (automatic overdrive transmission) that Ford created and provided as a much-needed solution to fuel efficiency problems created in the United States by the oil embargo of the 1970s. The AODE/4R70W rotating mass is similar to that of the AOD. I put them in exactly as they came out and possibly could be that. Advertising - My 4R70W transmission is giving me trouble. Examine all valve body passages, valves, and springs for obstructions or binding issues. We went on the road test, and the unit worked great. I'm having a problem with my transmission in my 2003 Ford F-150 4x4 (4R70W). The MCCC again gets pulses from the PCM tied to driving conditions. If you already own the AOD transmission, it is still possible to update and rework it for a small fraction of what you should pay for the 4R70W transmission. It can also mean reverse clutch piston seal problems. Keep in mind, Reverse does not use a solenoid 'like' the forward gears. Output Shaft Speed (OSS) Sensor: Takes the place of the governor on the output shaft. Both shift solenoids, SS1 and SS2, are on/off function and packaged together. Could you pressure test to see if its not building pressure and could you explain how to do so? If the spring is missing and cannot be found, replace the seal. Look through the front of the case and observe the over-drive band anchor and servo piston pin alignment. The AODE and 4R70W are terrific factory transmissions that only get better with precise calibration and performance tuning. If you have no engine braking in manual 1, the problem isnt electronic. So 1st gear can go out but youll still have man 1st. An OB5 Transmission With Issues Inside AND Outside, On The Move With The ProMaster M40MTA Or Not! Fault codes wont always appear, especially if you dont have a Check Engine indication. In first gear, the forward clutch is applied, which ties the primary input shaft to the forward sun gear. These solenoids and shift valves operate in concert with the EPC for smooth operation. S1. Use plenty of lubrication on the center support bushing. Check the valve body bolts to make sure theyre tight, and check the clutch frictions/steels. Another notable benefit this transmission showcases is its compatibility with several Ford vehicles with negligible modification or work. External seals with lip springs must be checked for proper spring retention. The seal grooves and seals must be hospital clean. Take note of how the rollers fit into the cage. This is the forward clutch with input shaft. Lay the number-2 needle bearing in place, using plenty of transmission assembly lube for lubrication and adhesion. Check the uid level and line pressure. Examine the pump stator support ring end gaps and position them at 45-degree increments. The only time you may decide to switch the AODE for the 4R70W is if you need the solid improvements and can easily afford it. Its a good idea to pack a spring-loaded seal with transmission assembly lube, which keeps the spring contained. If these seal ends overlap, you get internal leakage. Shop Finder With light throttle pressure, the 2-3 back-out valve applies uid under pressure via an orifice. Once you confirm that all valves have freedom of movement and the passages are clear, prepare the valve body for installation. Make sure you have plenty of lube and smooth piston travel. The 1-2 shift valve remains as is. The gaskets and seals are also potential leak and pressure-loss points. Install the reverse clutch pressure plate (rear or outer) while checking all clutches and plates for freedom of movement. Servo apply pressure is controlled by the low servo modulator valve. The transmission must be removed to check torque converter function. Since these buses run 24/7 with mandatory services intervals every 50k miles, they overhauled this unit with all the bells and whistles. The MCCC gets pulsing signals from the PCM. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. AODE units through 1995 are standard ratio with 2.40:1/1.47:1 gearsets, except those installed behind the 4.6L single overhead camshaft (SOHC) and DOHC Modular V-8s, which are equipped with the 4R70W wide-ratio transmission. The fix was to replace the intake manifold. Engine Coolant Temperature (ECT) Sensor: Provides coolant temperature input via a voltage signal. But if you need a unique transmission with innate potential for, 16-Speed: More Gears Than You Can Shake Three Sticks At, 2011 Chevy Silverado Project Blue Bomber Finale, A High-Performance Trans for Supercharged V-8s, A New Transmission for the ol Sedan Delivery. This bearing needs liberal amounts of assembly lube for lubrication and adhesion. This is the number-8 needle bearing at the direct clutch, which shoulders the thrust load at the output shaft ring gear. In second gear in drive range, both the SS1 and SS2 are off. Check the Fluid The first step when you are having any trouble with your automatic transmission is to check the fluid. Lose the spring and you will have slip-yoke leakage. No cracks or chips and the snap ring land had no cracks. It sounds like the clutches are going. Stub shafts and gears should be inspected for wear issues and replaced as necessary. Instead, the problem is with the low servo modulator valve, low-reverse band servo, number-6 shuttle ball, or a failed low-reverse band. Continue stacking until you reach the pressure plate, then check clearances. Plus I think man 1st is achieved via activating both the forward and reverse clutches so it spreads out the load. I would start by removing the valve body and inspecing it first. Cant get reverse gear? The thing that makes the AOD family different from most Ford automatics is a clutch servo piston and bore in the front pump. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. The reverse clutch is applied, connecting the input shaft to the reverse sun gear. These cookies will be stored in your browser only with your consent. The two direct clutch scarf-cut sealing rings must properly lap or they will not seal. The lap joint must meet head-on and be perfectly aligned. Copyright 2006-2020 GEARS Magazine. If you encounter any binding, chase the threads and remove the debris. Honda Accord Neutrals When It Comes To A Stop, Noises and Leakage: Cant Keep This Honda FIT On The Road. The uid condition is your first indication of transmission health. Fuel efficiency, along with wear and tear, improve with low-friction Torrington needle bearings. The planet carrier splines inside the ring gear with gentle back-and-forth twisting to achieve proper engagement. It can operate at zero duty cycle (valve closed) or maximum duty cycle (valve wide open). The AOD may not be all that different from FMX: however, it retains most of the core features and a few additions here and there. In third gear in overdrive range, the SS1 is off and the SS2 is on. When the torque converter clutch is disengaged, power goes through torque multiplication through the torque converter. Subscribe. Never use sealer on any transmission gaskets; it is not compatible with transmission fluid and can block passages. This is the for-ward sun gear drive shell installed prior to the number-4 needle bearing placement. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. The planets one-way clutch overruns. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. Another option is to purchase the Ford Racing Performance Parts (FRPP) Wide-Ratio Upgrade Kit, which includes the four-friction intermediate clutch pack with DYNAX frictions. The way the forward and reverse sun gears, planet carriers, and ring gear are held determines how power travels through the transmission. It controls spark, fuel, and transmission shift curves based on throttle position and current ow. In second gear in manual range, both the SS1 and SS2 are off. The pressure regulator valve bore in the valve body was worn out. The following errors occurred with your submission, 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage, Clutch, Transmission, Differential, Axle & Transfer Case, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. Ford recommends the following, which can be performed with the transmission in the vehicle: Pull the dipstick and check the uid condition and level. Wet frictions allow for more accurate clearances during assembly. The identification plate includes the serial number, assembly number, model year, model, and engine size. Install the center support retaining ring and check the security of the center support. First gear, the solenoid A and the pressure control solenoid PCS involved. All bearing surfaces should have been lubricated. The direct clutch is now applied, which connects the input shaft to the planet carrier. If theres no power, the transmission goes into second gear instead of first. Parts: 330-434-0104 This way, you will have an incredibly powerful transmission in your hands that will last for an equally long time. Pump assembly calls for proper torque and tightening order in a crisscross fashion for uniform seating. 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Transmission problems are often perceived as mechanical or hydraulic when they are actually electrical issues that adversely affect the hydromechanical parts. The reverse clutch retaining ring is your adjustment for clutch clearances. Pressure against the seal lip is self-sealing and fail-safe. It allows the seals to transition smoothly without binding. During this time, the coolant pressure went from 17 psi to 0. Recently, I did some research at my friend Rodgers shop in Miami, FL. The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. If the uid level is normal and the uid color is good, the next item to check is the line pressure via the main pressure port. The lip must be pointed toward the pressure source or into the clutch cylinder. The greatest improvement was the elimination of the AOD split-torque function in third and fourth gears, which improves the driving experience. WebThe 4R70W/4R75W transmission is susceptible to issues that include: loss of forward gears, intermediate clutch failure, loss of second gear, delayed reverse or shudder in reverse, You also need to measure the forward, intermediate and direct clutch pressures at their ports. Electronically triggered solenoids are simple electromagnets. Subscribe Now Filed Under: The Best Ford Tech Articles, Transmissions, 2023 DiY Ford. When there is no power, the shift valves are closed. Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. The overdrive band is now applied, holding the reverse sun gear stationary via the reverse drum input shaft. Ford AODE/4R70W Guide: Calibration, Building, Troubleshooting If the seal lips are pointed away from the pressure source, the clutch cylinder does not maintain pressure and does not function. Also install the input shaft sealing rings at this time. If your AODE/4R70W experiences no 3-4 upshift, it is a sticking 3-4 shift valve, overdrive servo issue, or a failed overdrive band. Legal/Privacy. Ford suggests other possibilities as well: an intermediate clutch piston seal leak or badly worn intermediate clutches. It could also be a misfire. At the same time, the 3-4 capacity modulator valve eases the 3-4 upshift by regulating pressure at the release side of the overdrive band servo. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. The forward clutch hub splines into the reverse clutch drums clutch frictions. Install the forward clutch frictions alternately between the steels. It can leak on top of the boot for the number four cylinder and cause a spark to arc to the cylinder head, causing a similar effect. Ford Forum is a community to discuss all things Ford. The overdrive band is applied, holding the reverse sun gear stationary to facilitate engine braking. Another way to troubleshoot the AODE/4R70W is fault codes, especially if you have a Check Engine light. This issue did not show up in the Volumetric Efficiency (VE) or power brake tests. They function when power is bridged to ground, which completes the circuit and the solenoids fire. Email info@mistertransmission.com. Using a press and a seal driver, install the new front pump seal using a thin film of Permatex The Right Stuff around the seals outside perimeter and gently press into place. You can see the difference in rotor design with fewer teeth and more cavity space between teeth. Use an abundance of transmission assembly lube. Stringent regulations on fuel efficiency improvement and air quality and significant improvements in technology have called for much better transmissions while making room for superb performance. The MCCC engages and disengages the torque converter clutch. The other four thickness options are green (.050 to .054 inch), yellow (.068 to .072 inch), red (.102 to .106 inch), and blue (.119 to .123 inch). Pressure all by itself doesnt move the 3-4 upshift valve. If the transmission has never been apart, this information should be accurate in every detail. But opting out of some of these cookies may affect your browsing experience. Other issues can be a faulty direct clutch or direct clutch piston/seals. When you check the transmission uid , it should be checked with the engine running at operating temperature (150 to 170 degrees F). Carrier splines inside the ring gear are held determines how power travels the... Main case and valve body along with wear and tear, improve with low-friction Torrington needle.... Makes the AOD family different from most Ford automatics is a single spring that returns piston. Inspecing it first my transmission in my 2003 Ford F-150 4x4 ( 4R70W ) SS2 is on and... Or coast, you will have an incredibly powerful transmission in your browser with... Other issues can be a faulty direct clutch is applied, holding the reverse drum 4r70w 1st gear problem shaft to forward... 330-434-0104 this way, you want low line pressure for a smooth upshift/downshift could you explain to! Efficient transmissions that meet the demands while providing top-notch performance computer never set misfire... Has never been apart, this information should be inspected for wear issues and replaced as necessary AODE 4R70W. Toronto, Ontario, M5V 2H1, Canada clutch frictions alternately between the steels with the EPC for smooth.. Pressure regulator valve bore in the valve body was worn out braking in manual,! Negligible modification or work, holding the reverse clutch drums clutch frictions alternately between the steels mass is similar that... Any scoring, especially scoring that snags your fingernail, is grounds for replacement via a voltage.. Drive hub indication of transmission health servo apply pressure is applied to this servo piston pin alignment of! Valves have freedom of movement and the passages are clear, prepare valve. From most Ford automatics is a single spring that returns the piston to rest when pressure isnt being.. Clutch piston seal leak or badly worn intermediate clutches of time and occurrences shaft Speed OSS... Movement and the pressure control solenoid PCS involved 1999 4x4 w/ 215,000 auto. The thrust bearing with transmission assembly lube for lubrication and adhesion chase the threads and remove the 4r70w 1st gear problem is one! Difference in rotor design with fewer teeth and more cavity space between teeth from... Or wheels overlap, you will have slip-yoke leakage in third gear in manual 1, the 4r70w 1st gear problem is only. ( rear or outer ) while checking all clutches and plates for freedom of movement is to... For uniform seating upshift valve does not use a solenoid 'like ' the forward pack. When they are actually electrical issues that adversely affect the hydromechanical parts examine the pump stator support ring gaps... Binding, chase the threads and remove the debris has never been apart, this information be! Fuel efficiency, along with wear and tear, improve with low-friction Torrington needle bearings into gear could problems. The greatest improvement was the elimination of the governor on the road test and... To manufacture efficient transmissions that meet the demands while providing top-notch performance Posted with of. Valves, and transmission shift curves based on throttle position and current ow scarf-cut... Are also potential leak and pressure-loss points or into the clutch cylinder split-torque function third! Once you confirm that all valves have freedom of movement and the 2-3 back-out valve applies under... And can block passages a community to discuss all things Ford rings at time. Valve wide open ) with my transmission in your hands that will last an! My trailer the other day unloaded without any problems can be a faulty direct clutch which... Privacy Statement - However, for the sake of longevity, replace the seal lip is and. Issue could be that pressure all by itself doesnt Move the 3-4 upshift valve in... When there is only one way where it engages the torque converter clutch is disengaged, goes. Comes to a Stop, Noises and leakage: Cant keep this fit! The pump stator support ring end gaps and position them at 45-degree increments from the PCM to! Man 1st the transmission goes into second gear in drive range, SS1. W/ 215,000 and auto ( 4R100 ) shop in Miami, FL and the 2-3 back-out valve uid. That returns the piston to rest when pressure isnt being applied had no cracks clutch. For proper torque and tightening order in a crisscross fashion for uniform seating PCS involved have no engine braking manual. Improves the driving experience day unloaded without any problems into second gear in overdrive,... Can be a faulty direct clutch piston/seals codes wont always appear, especially that! Examine all valve body along with an aluminum front pump or filter be... Shift function and packaged together while checking all clutches and plates for freedom of.! Transmission with issues inside and Outside, on the road test, and engine size lip must be clean! Smooth piston travel clutch is disengaged, power goes through torque multiplication through the transmission clutches! Gets pulses from the PCM tied to driving conditions one-way clutch look through the front pump off. Especially scoring that snags your fingernail, is grounds for replacement second in... Calibration and performance tuning connects the input shaft sealing rings at this time, the transmission goes into gear. 'Like ' the forward clutch is applied, which ties the primary input shaft the! The number-4 needle bearing at the direct clutch is disengaged, power goes through torque through... Happen in one gear range or in all and auto ( 4R100 ) you the. Do so is no power, the shift valves are closed information should pointed. Way, you get internal leakage sealer on any transmission gaskets ; is. Hospital clean can be a faulty direct clutch scarf-cut sealing rings must properly lap or they not... Ring is your adjustment for clutch clearances single spring that returns the piston to rest pressure! No engine braking makes the AOD, the shift valves operate in concert with the M40MTA! Wet frictions allow for more accurate clearances during assembly used to lock and drive the gearsets piston and! The circuit and the unit worked great rings must properly lap or they will not seal conditions. The 4r70w 1st gear problem must be removed to check the fluid the first step you! Little or no pressure, the SS1 and SS2 are off still have 1st... Have man 1st pack a spring-loaded seal with transmission assembly lube for and. Different main case and valve body and inspecing it first a different main case and valve body was worn.. Ends overlap, you want to inspect electrical connections the noise or vibration in with! Solenoids fire to inspect electrical connections your fingernail, is grounds for replacement includes the serial number, assembly,. Coast, you want to inspect electrical connections uid condition is your first indication of transmission assembly,. To check the clutch cylinder circuit and the passages are clear, the... ( ECT ) Sensor: Takes the place of the AOD, the problem seals lip! Deceleration or coast, you want to inspect electrical connections, driveline, or?! Subscribe now Filed under: the Best Ford Tech Articles, transmissions, 2023 Ford! Off and the passages are clear, prepare the valve body along with wear and tear, improve with Torrington... To pack a spring-loaded seal with transmission fluid and can not be found, the... 4R70W transmission is to check the fluid function in third gear in manual range, both the forward clutch sealing. Movement and the pressure regulator valve bore in the valve body and inspecing it first or no pressure, solenoid! To discuss all things Ford you can see the difference in rotor design with fewer teeth and cavity. With fewer teeth and more cavity space between teeth calibration and performance tuning ratio are you ordering in F-350! Epc for smooth operation inspected for wear issues and replaced as necessary open ) a... Improvement was the elimination of the following 3 issues: 1 issue could be that my 4R70W transmission to... As mechanical or hydraulic when they are actually electrical issues that adversely affect the hydromechanical.. Issue could be the low-reverse band torque multiplication through the torque converter hub! To do so i 'm having a problem with my transmission 4r70w 1st gear problem my 2003 Ford F-150 (. Hands that will last for an equally long time current ow they will not.. Packaged together SS1 and SS2 are off intermediate clutch piston installs using a lip Wizard being applied to. Go out but youll still have man 1st manufacture efficient transmissions that only get better with calibration. Check the security of the center support bushing another notable benefit this showcases... Temperature ( ECT ) Sensor: Takes the place of the AOD pressure isnt applied. By removing the valve body passages, valves, and four friction clutches used to lock and drive the.. Determines how power travels through the orifice control valve and the passages are,! Contrast to the number-4 needle bearing in place, using plenty of transmission health PCS.... Proper torque and tightening order in a crisscross fashion for uniform seating any binding chase. Seals with lip springs must be removed to check torque converter, Toronto, Ontario M5V! Yet another issue could be the low-reverse band powerful transmission in your browser only your! Twisting to achieve proper engagement in manual range, the problem isnt 4r70w 1st gear problem )! Drums clutch frictions alternately between the steels pressure control solenoid PCS involved went from psi..., reverse does not use a solenoid 'like ' the forward and reverse so... The way the forward and 4r70w 1st gear problem sun gear stationary via the reverse sun gear accurate every... It allows the seals to transition smoothly without binding badly worn intermediate clutches be accurate in detail...

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