Excessive shock or flares on 3-4 upshift or 4-3 downshift

Probable cause(s)

1. A/T clutch pressure control solenoid valve B defective
2. A/T clutch pressure control solenoid valve C defective
3. Foreign material in separator plate orifice
4. 3rd accumulator defective
5. 4th accumulator defective
6. 3rd clutch defective
7. 4th clutch defective

Notes

- Check the D indicator, and check for loose connectors. Inspect the solenoid valve filter/gasket and O-rings for wear and damage, and inspect the solenoid valves for seizure.
- Check the 3rd and 4th clutch pressures.
- Inspect the clutch piston, clutch piston check valve, and O-rings. Check the spring retainer and retainer seal for wear and damage. Inspect the clutch end-plate-to-top-disc clearance. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch waved-plate height. If the height is out of tolerance, replace the waved-plate. If the discs and plates are OK, adjust the clearance with the clutch end plate.
- Inspect the 3rd clutch feed pipe. If the 3rd clutch feed pipe is scored, replace it and O-ring under the feed pipe guide.
- Replace the secondary shaft if the bushing for the 3rd clutch feed pipe is loose or damaged.