4R70W Rebuild Checklist
Note:
Some Ford part numbers will be superceeded with updated
part numbers. Always verify the new part numbers with your parts advisor.
Teardown
Remove output shaft speed sensor from case before you remove geartrain
to prevent breaking sensor. If you beak it the Ford part # F4AZ-7H103-A.
Always replace 1991 - 1994 MLPS. Lots of failures just like early E4OD
MLPS. Ford part # F5AZ-7A247-A. With 1995 and up don't put MLPS
in parts washer with case. The water and soap kills them.
| MLPS (Manual Lever Position Sensor) Update New style MLPS released Date - 1995 Reason Original style did not have a very good weatherproof seal. This allowed water to enter the connector and corrode the pins, which caused electrical problems. New MLPS has improved weatherproof seal. Parts Changed 1. MLPS 2. Vehicle harness connector Important The new style MLPS comes with a matching vehicle harness connector. The problem is that you have to remove the pins and their wires from the old vehicle harness connector. What ever you do don't pull all the pins out at the same time because you will never figure out were they go. Easiest thing to do is remove one pin at a time and re-install it into the new connector. Interchange Will fit all past models. Part Numbers MLPS (includes harness connector) F5AZ-7A247-A |
| Update Output Shaft Date - 1995 Reason To eliminate governor oil feed bore and 4th sealing ring groove, which is not used on AODE. That means the shaft no longer uses the governor pin, sleeve and snap ring. Parts Changed Output Shaft changed from 4 ring to 3 ring and has no governor passage. Interchange Will fit all past models Part Numbers Note If you need a shaft check with your hard parts supplier, many of them have good used updated output shafts in stock. |
Early model output shafts use a pin in governor feed hole. Don't loose
it. If you already lost it, the pin measures .180'' Thick by 1.770'' Long.
Be careful, there are 2 different OD assemblies. One uses a rubber sleeve
and piston, while the other only uses just a piston. It's real common mistake
to install small servo without cover.
Pump
Inspect pump body for wear. Look closely at area between eyebrows.
Check pump clearances, must be perfect.
Outer gear to body - .006'' max.
Lobe to lobe - .006'' max.
Side clearance - .0005'' - .002''
Loctite and stake pump bushing.
Use your finger to check down inside bore of stator for ring grooves.
Late stator will feel ring grooved because it's stepped from factory. You
have to look at it closely.
Flat file stator.
2nd gear piston bleed hole installs at 12 O'clock - straight across
from the feed holes.
Set Total Unit Endplay between .005'' to .020'' (selective washer on
stator) Red colored # 4 washer will usually get you there.
| Update Pump Stator Support Date - 1994 Reason New stator has a U-groove style bushing to reduce bushing wear, which decreases forward clutch sealing ring failure. Recommendation If your stator is still good then there is no reason to update. We have seen just as many of the updated stators bad as the earlier one's. Interchange Will fit all past models and can be I.D. by a step that is machined into the sealing ring bore. Part Numbers Pump Stator F4AZ-7A108-A |
Reverse, Forward & Direct Drum
| Reverse Input Drum Update Reverse input drum changed from 7-element roller to 14- element, then to mechanical diode. Date - Late 1997 Reason Reduced failure of the intermediate sprag. Note The AODE came equipped with the 7- roller element drum. The 4R70W came with the 14- roller element drum. The 14-element drum is suppose to be the stronger of the two because it has twice as many rollers in the element. However, the 14- element sprag still fails in police cars, fleet vehicles, taxis and limousines. In order to reduce sprag failure Ford has released a new design reverse input drum that uses a mechanical diode. Parts Changed · Reverse input drum · Inner race · Outer race · Sprag element · Retainer and snap ring Interchange Will fit all past models. Part Numbers Mechanical Diode Reverse Input Drum (Sprag not included) # F8AZ-7D044-AA Mechanical Diode Sprag Package # F8AZ-7A089-AA |
Reverse drum band surface must be flat. Sand apply and ring surfaces.
No more than 1/16'' wear allowed on sides of drive lugs.
2nd gear element springs and rollers, must be perfect to reuse. Inner
and outer sprag races must also be perfect. Sand outer race with 80 grit.
Sprag Rotation 2nd Gear Sprag - turns LEFT, locks right.
Low Sprag - outer race turns LEFT, locks right.
Always modify sprag retainer on Reverse input drum to keep snap ring
from coming off.
1. Use a hacksaw to cut 4 tabs (5/16'' wide)
in the sprag retainer. Cut the tabs just a little deeper than the with
of the snap ring.
2. Bend the tabs up & install retainer
on drum.
3. Install snap ring and bend tabs down over
it.
On 7 and 14 element Reverse drums the outer race installs with the taper
up facing towards you.
OK to reuse 7 or 14 element Reverse drums on normal usage cars. Police,
taxi, limousine and fleet always update to ''mechanical diode''
style drum - Ford part # F8AZ-7D044-AA (Must be used with sprag
package F8AZ-7A089-AA).
| (Mechanical Diode Style) Update Reverse input drum changed from 7-element roller to 14- element, then to mechanical diode. Date - Late 1997 Reason Reduced failure of the intermediate sprag. Note The AODE came equipped with the 7- roller element drum. The 4R70W came with the 14- roller element drum. The 14-element drum is suppose to be the stronger of the two because it has twice as many rollers in the element. However, the 14- element sprag still fails in police cars, fleet vehicles, taxis and limousines. In order to reduce sprag failure Ford has released a new design reverse input drum that uses a mechanical diode. Parts Changed · Reverse input drum · Inner race · Outer race · Sprag element · Retainer and snap ring Interchange Will fit all past models. Part Numbers Mechanical Diode Reverse Input Drum (Sprag not included) # F8AZ-7D044-AA Mechanical Diode Sprag Package # F8AZ-7A089-AA |
Forward drum likes to ring groove on one side only, look closely - Ford
part # F3LY-7F207-A. Sand ring surface with 220 grit. Make sure
both check balls are free. Use 700 solid input shaft rings in place of
OEM.
| Forward Clutch Sealing Rings Update New forward clutch sealing rings released Date - 1994 Reason Original style rings were prone to wear because stator support does not have a bushing in the end of it like AOD does. So rings are unsupported and move around a lot more. New style rings are made of a much stronger ''bullet proof'' material. Parts Changed Forward clutch sealing rings. Can be I.D. by silver color. Interchange Will fit all past models. Part Numbers Forward Clutch Sealing Rings (Updated style) F4AZ-7D019-A |
Wet air check the forward and reverse drums on the pump. Watch for pump
and ring cross leaks.
Direct drum steels must slide up and down freely in drum, if not toss
drum. Use 325-4L solid input shaft rings in place of OEM. Very hard to
size these rings, but fixes ring leakage problem.
Check ball in Direct piston likes to leak. Always reseat it with small
punch and hammer
Clutch Clearance Forward - .050'' to .070'' (selective snap rings)
2nd Gear - .010'' to .020'' (selective steels)
Note:
Use an H Gauge to check. If you don't have one make
sure top steel is flush or just below the pump gasket surface. Reverse
Input - .040'' to .060 (selective snap rings)
Direct - (selective snap rings)
4 friction - .040 to .050''
5 friction - .050'' to .060''
6 friction - .060'' to .070''
4R70W Planetary Parts
|
Case
Check sealing ring bore in case for wear. Bore must be perfect. Worn
output shaft case bushing and/or extension housing bushing are what cause
case to wear. Always replace both bushings.
Check case dams and passages for breakage from high line pressure
spikes (see Transgo Shift Kit).
Check EPC solenoid bore in case for wear.
| EPC Solenoid and Hold Down Bracket Update New EPC solenoid and bracket Date EPC solenoid and hold down bracket changed 1993. Hold down bracket changed again in 1996. Reason 1993 change was to reduce EPC solenoid clogging and eliminate wear to the snout of the solenoid. New bracket retains solenoid in case much better then original. 1996 hold down bracket was changed because valve body plate was made thinner. Recommendation Always replace the EPC solenoid no matter what year. They have a high failure rate and are almost always restricted with debris. Just make sure you are using the correct hold down bracket and be careful not to cut the o-rings on the solenoid when you install it into the case. Parts Changed 1993 1. EPC solenoid body changed in area of hold down bracket. 2. EPC hold down bracket redesigned to fit new solenoid. 1996 1. EPC hold down bracket was made 1/16'' shorter. Interchange 1993 EPC solenoid and matching bracket will fit 1992 to 1995 transmissions. 1996 and up still use the same EPC solenoid but must use the 1/16'' shorter hold down bracket. Part Numbers 1992 to 1995 EPC solenoid F5AZ-7G383-AA 1992 to 1995 hold down bracket F5AZ-7H111-A 1996 and up EPC solenoid F6AZ-7H111-A 1996 and up hold down bracket (1/16'' shorter for thinner VB plate) F6AZ-7H111-A |
Accumulator bores in case like to wear out, especially the 1-2. If worn
badly case must be replaced. If there good or have very minor wear Scotchbrite
them so rubber seals don't wear out.
If ring gear hub fits loose on output shaft peen a couple of the splines
over and install hub.
Always replace 1-2 aluminum style accumulator piston with the molded
rubber style - Ford part # F7AZ-7F251-AA.
| 1-2 & 2-3 Accumulator Update 1-2 & 2-3 accumulator piston changed from aluminum to rubber Date - 1997 Reason Aluminum style wears out the case and burns up the 2nd clutch. Recommendation Always update to the rubber accumulator. If the bore is worn in your case you can salvage it by Scothbriting the bore real good and installing the rubber piston. Parts Changed 1-2 & 2-3 accumulator piston changed from aluminum to molded rubber. AOD does not have a 1-2 accumulator piston. Interchange Will fit all past models. Part Numbers 1-2 Accumulator Piston AODE (Updated molded rubber style) F7AZ-7F251-AA 2-3 Accumulator Piston AOD/AODE (Updated molded rubber style) F7AP-7H292-AA |
Never reuse the early aluminum style 2-3 accumulator. The Teflon rings
leak REAL BAD! Instead use the molded rubber style -Ford Part #
F7AP-7H292-AA.
Band Adjustment.
If you changed the Low/Reverse band or the planet check the band adjustment.
Low/Reverse Band - 1/4'' (selective servos)
Here's how to check it
1. Install servo assembly into case.
2. Use the back of a hammer handle to push down the servo cover until
it stops.
3. Measure the distance between the bottom of the snap ring and the
servo cover. This is your clearance.
4. Adjust by grinding or welding end of servo pin.
OD Band
Non Adjustable - However, once the pump is tight and the OD servo is
installed take a pair of channel locks and make sure you can turn the output
shaft in both directions. If the output shaft only turns one way the band
is too tight. Fix it by grinding the pin shorter.
If you changed the OD band or reverse input drum check the band adjustment.
Valve Body
Valve Body Check Ball Locations
| Update Valve Body Date - 1996 Reason To prevent the bolts that hold the valve body cover from loosening up and blowing out the gasket. Parts Changed 1. Valve body cover was made thinner. 2. EPC solenoid hold down bracket was made 1/16'' shorter to accommodate the thinner cover plate. 3. Guide pin bolts and VB dowels were made smaller. Bolts changed from 13mm head to 10mm. 4. Case dowel holes were made smaller. Interchange Will fit 1992-1997. SEE FOLLOWING: TSB 97-16-7 & TSB 95-8-3 Part Numbers: F7SZ-7A100-AA (1996-1997 valve body); F6AZ-7K720-A (2 VB alignment dowels); F7AZ-7C155-AA (VB to case gasket) Note Most hard parts suppliers will have good used 1996 and up valve bodies in stock. 1996 and up hold down bracket (1/16'' shorter for thinner VB plate) F6AZ-7H111-A See MN12 Performance Valve Body Upgrade for 1992-1995 AODE/4R70W |
Inspect pressure regulator boost sleeve and PR valve in valve body for
wear. Sonnax replacement PR sleeve is part # 76948-02K. Sonnax replacement
PR valve is # 76948-01K.
Drill a .050'' - .055'' line to lube hole in VB dam. This keeps the
torque converter charged.
Flat File/Stone VB and Case . Warpage is a big time problem.
| Valve Body Stiffener Plate Update Large stiffener plate on valve body made thicker Date - 1995 Reason Eliminate a cross leak between forward and reverse oil circuits. Recommendation If you have one on the bench and the forward or reverse clutches are burned up and you can't see why, make sure you update to the thicker plate. Parts Changed: 1. Stiffener plate made thicker. 2. Bolts for plate made longer. Interchange Will fit all past models. See TSB-94-26-9 Part Numbers Valve Body Stiffener Plate (Updated style - thicker, includes bolts) Ford Part# F4AZ-7F282-A |
If you have to change the VB, make sure you are installing the right
one. . VB's are matched to Year of Vehicle and Shift Quadrant.
Always replace the solenoids with new Ford OEM.
Shift - F7AP-7G484-AA
TCC (Torque Converter Solenoid) - 2 different ones!
1 to 3 ohms - F2VY-7G136-A (1992-1995) Note:This
part # F2VY-7G136-A is still
the current number.
10 to 16 ohms - F7AP-7G136-AA (1996-up valve
body only)
(If your vehicle is pre 1996 then use the F2VY-7G136-A
TCC solenoid.) If you are unsure check the TCC with an OHM meter.
The 1-3 ohms solenoid should be about 1.3 ohms and the 10-16 ohm solenoid
should be about 10.9 ohms. The 1-3 ohms TCC has a Black connector and the
10-16 ohms TCC has a WHITE connector.
EPC (Electronic Pressure Solenoid) -
1992-95 EPC F5AZ-7G383-A (hold down bracket F5AZ-7H111-A);
1996-UP EPC F6AZ-7G383-AA (hold down bracket
F6AZ-7H111-A)
Always update this to the latest solenoid and bracket design.
| Shift Solenoids and TCC Solenoid Update New shift solenoids and TCC solenoid Date - 1995 Reason Improved shift solenoids to prevent clogging. TCC solenoid was changed from 1-3 ohms to 10 to 16 ohms for 1995 Lincoln Town Car, Grand Marquis, Ford Crown Victoria and all 1996 and up models. Recommendation Always replace the shift solenoids and the TCC solenoid on every overhaul. They have a high failure rate and are always restricted with debris, which causes strange shift and Lock up problems. Parts Changed 1. Shift solenoids redesigned to reduce clogging. 2. TCC solenoid changed from 1-3 ohms to 10 to 16 ohms. Interchange & Part Numbers Shift solenoids will fit all past models. F7AZ-7G484-AA TCC solenoids are not interchangeable. You must use the correct resistance solenoid for year and type of vehicle. · TCC solenoid - 1 to 3 ohms (Fits 1992 to 1995 except 1995 Lincoln Town Car, Grand Marquis, Ford Crown Victoria) F2VY-7G136-A · TCC solenoid - 10 to 16 ohms (Fits 1995 Lincoln Town Car, Grand Marquis, Ford Crown Victoria and all 1996 and up models) F7AZ-7G136-A |
Solenoid Resistance
Torque Converter
| Torque Converter Update Torque converter Lock up apply surface and piston changed. Date - 1995 Reason To fix a Lock up shudder that happens in 3rd or 4th gear on light acceleration or during the 3-4 or 4-3 shift on 1992 to 1995 vehicles. See TSB's 95-23-4 & 96-25-17 Parts Changed · Lock up apply piston surface made 7/8'' larger. · Lock up pressure plate surface made 7/8'' larger Interchange: Will fit all past models Part Numbers: http://www.protorque.com Pro Torque Note Check with your converter supplier, many of them now have the updated converters in stock. |
Coolant Return Lines
AOD - Cooler return is BOTTOM line on case
AODE - Cooler return is TOP line on case
Clutch & Band Application Chart
Gear | Clutches Applied | Sprags Holding | Band Applied | Solenoids Energized |
|---|---|---|---|---|
"D4" 1st gear | Fwd. | Low Roller | Shift Solenoid 1 | |
"D4" 2nd gear | Fwd. and 2nd | 2nd Roller | Both Sol. are OFF | |
"D4" 3rd gear | Fwd., 2nd and Direct | Shift Solenoid 2 | ||
"D4" 4th gear | 2nd and Direct | OD Band | Shift Sol. 1 & 2 | |
Reverse | Rev. Input | Low/Reverse | ||
"D3/D2" 1st gear | Fwd. | Low Roller | Shift Solenoid 1 | |
"D3/D2" 2nd gear | Fwd. and 2nd | 2nd Roller | Both Sol. are OFF | |
"D3/D2" 3rd gear | Fwd., 2nd and Direct | Shift Solenoid 2 | ||
"D1" 1st gear | Fwd. | Low Roller | Shift Solenoid 1 |
Note
When Selector Lever Is In
- ''OD'' - Vehicle will start off in 1st gear and automatically upshift
into all four gears.
- ''D'' - Vehicle will start off in 1st gear and will automatically upshift
to 2nd and 3rd, but not to 4th.
- ''1'' - Vehicle will start off in 1st gear and will not upshift.
Transmission Oil Pressure Specs
| AODE Note: All pressure tap locations are clearly MARKED right on the case on AODE's & 4R70W's. Main Line Pressure
EPC Pressure
Clutch Pressure Note You can check for leaks in the Clutch/Band circuits by comparing them to Main Line Pressure. They should be within 10 psi of each other. How To Check It
|
