Automatic Transmission Overhaul - 4L30-E: Specifications Isuzu Trooper II

Shudder During Torque Converter Clutch (TCC) Application

1. Defective Oil Filter Or Gasket
2. Defective Torque Converter
3. Defective Turbine Shaft "O" Ring

TORQUE CONVERTER STALL SPEED TEST

1. Apply parking brake. Block all wheels. Connect tachometer and start engine. Warm engine to normal operating temperature. Ensure transmission fluid level is correct.
2. Fully depress brake pedal. Place gearshift lever in "D" position. Fully depress accelerator for no more than 5 seconds and note highest engine speed. This is the torque converter stall speed.
3. Place gearshift lever in "N" position. Operate engine at 1200 RPM for at least one minute to cool transmission. Repeat test procedure with gearshift lever in "3", "2", "L" and "R" positions.
4. Ensure torque converter stall speed is within specification. See «TORQUE CONVERTER STALL SPEED SPECIFICATIONS»(ref-431-S42223498372000030800000) table. If torque converter stall speed is not within specification, an internal torque converter or transmission failure is present.

TORQUE CONVERTER STALL SPEED SPECIFICATIONS

LINE PRESSURE SPECIFICATIONS

LINE PRESSURE SPECIFICATIONS (1997 PASSPORT & RODEO)

LINE PRESSURE SPECIFICATIONS (1998 PASSPORT & RODEO)

LINE PRESSURE SPECIFICATIONS (1997 SLX & TROOPER)

LINE PRESSURE SPECIFICATIONS (1998 SLX & TROOPER)

LINE PRESSURE TEST TROUBLE SHOOTING

TORQUE CONVERTER

Torque converter cannot be serviced and must be replaced if defective.

Note. For torque converter stall speed test, see TORQUE CONVERTER STALL SPEED TEST under TRANSMISSION TESTING.

Scheme 1

Scheme 2

Scheme 3

1. Remove torque converter. Remove "O" ring from end of turbine shaft. On 4WD models, remove transfer case from rear of transmission.
2. On all models, remove screws, cover and mode switch and wiring harness. (Scheme 1) Remove bolts, adapter case oil pan and gasket.
3. Disconnect electrical connectors at solenoids on adapter case valve body. Note location of adapter case valve body bolts for reassembly reference. Remove bolts, adapter case valve body, transfer plate and transfer plate gaskets.
4. Remove wiring harness for solenoids on adapter case valve body. Remove bolts, main case oil pan, magnet and gasket. Remove bolts and oil filter.
5. Remove bolts, roller, spring and manual detent. Disconnect wiring harness at solenoids on main valve body and the case 4-pin connector. Remove 4-pin connector.
6. Remove bolts, servo cover and gasket. Position transmission case with main valve body facing upward. Note location of main valve body bolts for reassembly reference. Note position of manual valve link, as long end fits into manual valve and short end fits into range selector.
7. Remove bolts, main valve body with manual valve link, transfer plate gaskets and transfer plate. Note location of 2 check balls in transmission case. (Scheme 2) Remove check balls from transmission case.
8. Turn transmission to vertical to drain fluid. Return to horizontal when drained. Using spring compressor, compress servo piston and return spring. Remove servo piston retaining snap ring. Slowly release spring compressor. Remove spring compressor, servo piston, apply rod and return spring. (Scheme 1)
9. Remove bolt and speed sensor with "O" ring from extension housing. On 2WD models, remove drive shaft companion flange nut, drive shaft companion flange and "O" ring from rear of transmission. On all models, remove bolts, extension housing and gasket from transmission case.
10. On 4WD models, remove retaining ring. On 2WD models, remove flange nut, flange and "O" ring. Remove speed sensor drive gear and parking lock gear with seal ring from output shaft. Position transmission case in vertical position with torque converter housing facing upward.
11. If removing oil pump assembly from torque converter housing, loosen but DO NOT remove the 5 inner bolts on torque converter housing. These are the oil pump assembly-to-torque converter housing bolts.
12. Remove torque converter housing-to-adapter case bolts. These are the 7 outer bolts. Remove torque converter housing, outer seal ring, oil pump, gasket and selective thrust washer.
13. Remove 4th clutch retainer from the turbine shaft. (Scheme 3) Pull upward on turbine shaft and lift overrun clutch assembly and 4th clutch plates and clutch discs from transmission case. Remove thrust bearing, overdrive internal gear and thrust washer.
14. Remove adapter case and center support assembly with 4th clutch piston. (Scheme 4) Remove seal ring, selective thrust washer and "O" rings from transmission case.
15. Using spring compressor, compress 4th clutch retainer and spring assembly. Remove snap ring from adapter case. Remove spring compressor, snap ring and 4th clutch retainer and spring assembly.
16. To remove 4th clutch piston from adapter case, hold adapter case and pull 4th clutch piston from adapter case. Remove converter housing-to-main case bolts.
17. While holding intermediate shaft, twist and pull out 2nd and 3rd clutch assemblies with reverse clutch plates and clutch discs from transmission case while holding onto output shaft. (Scheme 4) Separate 2nd and 3rd clutch assemblies. Remove thrust washer, reverse clutch plates and pressure plate.
18. Remove bearing, washer, planetary carrier and thrust bearing assembly from transmission case. (Scheme 4) Remove reaction sun gear, needle bearing, brake drum, brake band and thrust bearing assembly.
19. For reassembly reference, measure height of spring pin in relation to transmission case. Spring pin retains selector shaft in transmission case. (Scheme 5)
20. Insert wire into center of spring pin to prevent spring pin from collapsing during removal. Protect machined surface of transmission case. Remove spring pin.
21. Remove selector shaft nut from end of selector shaft. Remove parking lock and range selector lever with actuator rod from selector shaft. Remove selector shaft.

Scheme 4

Scheme 5

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

TRANSMISSION SPECIFICATIONS

TRANSMISSION SPECIFICATIONS