A/T - A604 1-2 Gear Upshift Shudder
90chrysler15SUBJECT: 1-2 Upshift Shudder 1989-91 Vehicles Equipped With A-604 Transmission
NO.: 21-22-90
GROUP: TRANSMISSION
DATE: Nov. 19, 1990
MODELS:
1989-91 (AA) SPIRIT/ACCLAIM/LEBARON
(AC) DYNASTY/NEW YORKER/LANDAU/SALON
(AG) DAYTONA
(AJ) LEBARON COUPE/LEBARON CONVERTIBLE
(AS) CARAVAN/GRAND CARAVAN/CARAVAN C/V
VOYAGER/GRAND VOYAGER/TOWN & COUNTRY
(AY) IMPERIAL/NEW YORKER FIFTH AVENUE
SYMPTOM/CONDITION:
Some vehicles equipped with the A-604 transmission may exhibit an occasional shudder during the 1-2 upshift. This condition is most noticeable when the vehicle is being operated on a smooth blacktop road after the transmission has reached normal operating temperature.
DIAGNOSIS:
Check transmission fluid level and condition. Connect the DRB II. Record fault codes. Perform the diagnostic test as outlined in the appropriate Powertrain Diagnostic Manual. Be sure to complete the shift lever test, clutch test and record clutch volumes (CVI).
Select the RPM display on the DRB II. Road test the vehicle a sufficient distance to ensure the transmission has warmed up.
NOTE: THE FOLLOWING STEP SHOUID BE PERFORMED ON A SMOOTH BLACKTOP ROAD.
Initiate a 1-2 upshift from a throttle angle (TSP) of 10" through wide open throttle in steps of 50.
If shudder was experienced during the 1-2 upshift, perform the repair procedure.
If no shudder was experienced, but fluid condition, fault codes, shift lever test or clutch test indicate a problem, correct as required.
PARTS REQUIRED:
REPAIR PROCEDURE:
This repair involves removing the transaxle, and reconditioning the 2-4 clutch.
Use the appropriate Service Manual as a guide in performing the following steps.
1. Remove the transaxle assembly.
2. Remove the oil pan and valve body.
3. Measure and record the input shaft end play.
4. Remove input speed sensor.
5. Remove the oil pump and gasket.
NOTE: ON 1991 VEHICLES BE SURE TO REMOVE THE INTERNAL OIL COOLER BYPASS VALVE.
6. Remove the No. 1 caged needle bearing.
7. Remove the input clutch assembly.
8. Remove the front sun gear and No. 4 thrust washer.
9. Remove the front carrier and rear annulus assembly and the No. 6 needle bearing.
10. Remove the rear sun gear and No. 7 needle bearing.
11. Remove the 2-4 clutch retainer snap ring using tool 5058.
12. Remove the 2-4 clutch retainer and return spring.
13. Disassemble and clean the 2-4 clutch retainer and piston.
14. Install the 4 new clutch discs PN 4567212, and 4 new clutch plates PN 4412247.
15. Assemble the 2-4 retainer, using new clutch seal package PN 4504050.
16. Install the 2-4 retainer, spring, and snap ring.
17. Check the 2-4 clutch clearance. The clearance should be 0.76 to 2.64 mm (.030 to .140). If clearance is not within specification, the clutch is not assembled properly.
18. Install the rear sun gear and No. 7 needle bearing.
19. Install the front carrier and rear annulus assembly and the No. 6 needle bearing.
20. Install the front sun gear and No. 4 thrust washer.
NOTE: IF INPUT SHAFT END PLAY WAS FOUND OUT OF SPECIFICATION .13 TO .64 mm (.005 To .025) DURING DISASSEMBLY REPIACE THE NO. 4 THRUST WASHER WITH THE CORRECT WASHER AT THIS TIME.
21. Install the input clutch assembly.
22. Install the No. 1 caged needle bearing.
23. Install oil pump using new gasket package PN 4504555.
NOTE: ON 1991 VEHICLES BE SURE TO INSTALL THE INTERNAL OIL COOLER BYPASS VALVE.
24. Install input speed sensor.
25. Check input shaft end play.
26. Install the valve body, using new valve body gasket package PN 4504553.
27. Install oil pan.
28. Install the transaxle assembly.
29. Refill the transaxle with MOPAR ATF PLUS (ATF Type 7176), or DEXTRON II.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No.
1-2 Upshift Shudder 21-34-02-92 ........ 4.8 Hrs.
FAILURE CODE: 58 - Internal defect