A/T Governor - Delayed Upshift
NO: 21-19-94GROUP: Transmission
DATE: Sep. 30, 1994
SUBJECT:
Delayed Upshift - 4-Speed (Hydraulic Governor) Automatic Transmission
MODELS:
1992 - 1994 (AB) Ram Van/Ram Wagon
1992 - 1993 (AD) Ram Pickup, Ram Chassis
1992 - 1994 (AN) Dakota/Dakota Chassis Cab
1994 (BR) Ram Truck
1993 - 1994 (ZJ) Grand Cherokee/Grand Wagoneer
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 4-SPEED (HYDRAULIC GOVERNOR) AUTOMATIC TRANSMISSION (42RH/46RH).
SYMPTOM/CONDITION:
Delayed upshift for about 1/4 mile in cold weather (32 degrees F and below). This condition is most noticeable after the vehicle has been parked for 8 or more hours.
DIAGNOSIS:
Allow vehicle to set for at least 8 hours. With the 100 psi Test Gauge C-3292 connected to the governor pressure port, start the vehicle and put the transmission into Drive. Slowly increase vehicle speed. The governor pressure should increase in proportion to vehicle speed. Disconnect test gauge C-3292 and then drive vehicle for about 1/4 to 1/2 mile. If the vehicle does not upshift within this time period and/or the governor pressure does not match the vehicle speed, perform the following repair.
PARTS REQUIRED:
3 4461011 Seal Ring - Transmission Governor Drive (Cast Iron)
REPAIR PROCEDURE:
This bulletin involves replacing teflon governor drive seal rings with cast iron seal rings.
1. Shift transmission into Park, raise the vehicle.
2. Remove transmission oil pan, remove gasket, drain oil and reinstall pan.
3. Mark propeller shaft universal joint and axle pinion yoke for alignment reference at installation.
4. Disconnect and remove propeller shaft.
5. Support transmission with transmission jack.
6. Remove rear crossmember.
7. Remove vehicle speed sensor and speedometer adapter.
8. Remove transfer case.
9. Remove bolts attaching overdrive unit to transmission.
CAUTION:
SUPPORT THE OVERDRIVE UNIT WITH A JACK BEFORE MOVING IT REARWARD. THIS IS NECESSARY TO PREVENT DAMAGING THE INTERMEDIATE SHAFT. DO NOT ALLOW THE SHAFT TO SUPPORT THE ENTIRE WEIGHT OF THE OVERDRIVE UNIT.
10. Carefully work the overdrive unit off the intermediate shaft. Do not tilt compounder during removal. Keep it as level as possible.
CAUTION:
INSERT ALIGNMENT TOOL 6227-2 IN SPLINES OF PLANETARY GEAR AND OVERRUNNING CLUTCH TO PREVENT SPLINES FROM ROTATING OUT OF ALIGNMENT. IF MISALIGNMENT OCCURS, OVERDRIVE UNIT WILL HAVE TO BE DISASSEMBLED IN ORDER TO REALIGN SPLINES.
11. Remove and retain overdrive piston thrust bearing. Bearing may remain on piston or in clutch hub during removal.
12. Place overdrive unit over drain pan. Tilt unit to drain residual fluid from case. Examine fluid for clutch material or metal fragments. If fluid contains an excessive amount of debris, overhaul will be necessary.
13. Remove overdrive piston thrust plate spacer and retain. It is a select fit part and can be reused.
14. Remove overdrive clutch pack retaining ring. Then remove the overdrive clutch pack and wave spring.
15. Remove overdrive clutch reaction snap ring. Note that snap ring is located in same groove as wave spring.
16. Remove access cover and gasket from case. Cover provides access to output shaft front bearing locating ring. Expand output shaft bearing snap ring with snap ring pliers. Push output shaft forward to release shaft front bearing from locating ring.
17. Remove geartrain assembly from housing and stand on end with output shaft pointing upward.
18. Remove Teflon Seal Rings from governor drive.
19. Install new seal rings (cast iron) on governor drive.
NOTE:
CAREFULLY EXPAND EACH SEAL INTO EACH GROOVE OF DRIVE. AVOID OVERSPREADING SEALS DURING INSTALLATION TO ENSURE TIGHT FIT.
20. Once the cast iron seal rings are in place, interlock the ends of each (without the use of tools) by compressing the sides of the seals providing enough slack at the ends so that the interlocking can take place.
21. Verify hook type seals are properly interlocked and seals rotate freely in the grooves (Figure 1).
22. Install overdrive unit case over geartrain.
23. Expand front bearing locating ring with snap ring pliers. Slide case downward until locating ring locks in bearing groove and release snap ring.
24. Install locating ring access plate and gasket in overdrive unit case.
25. Install O/D clutch pack reaction ring first. Reaction ring is flat with notched ends.
26. Install wave spring on top of reaction ring. Reaction ring and wave spring both fit in same ring groove. Use screwdriver to seat each part securely in groove.
27. Install clutch pack reaction plate.
28. Install first clutch disc followed by first clutch plate.
29. Install remaining clutch disc and plates in same order.
30. Install clutch pack pressure plate and wire-type clutch pack retaining ring.
31. Install overdrive piston thrust bearing. Install overdrive piston in retainer.
32. Verify that splines in overdrive planetary gear and overrunning clutch hub are aligned. Carefully slide Alignment Tool 6227-2 out of overdrive planetary gear and overrunning clutch splines.
33. Install overdrive unit using a new gasket. Do not use any type of sealer to secure gasket. Use petroleum jelly only.
34. Raise overdrive unit and carefully slide it straight onto intermediate shaft. Insert park rod into park lock reaction plug at the same time. Avoid tilting overdrive during installation as this could cause the planetary and clutch hub splines to move out of alignment.
35. Align slip-fit governor tubes and work overdrive unit forward on intermediate shaft until seated against transmission case.
36. Install bolts attaching overdrive unit to transmission unit. Tighten bolts in diagonal pattern to 34 N-m (25 ft.lbs.).
37. Install transfer case.
38. Install crossmember.
39. Install speed sensor and speedometer adapter. Be sure to index adapter.
40. Connect speed sensor and overdrive wires.
41. Align and install propeller shaft.
42. Lower vehicle and refill transmission with Mopar ATF Plus, Type 7176 transmission fluid.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 21-15-05-94 (2 Wheel Drive Vehicles) 2.1 Hrs.
21-15-05-95 (4 Wheel Drive Vehicles) 3.0 Hrs
FAILURE CODE: P8 - New Part