Symptoms
Slipping, harsh or delayed shifts, or a fluid leak. Low fluid is the usual cause of failures, according to Bob Is The Oil Guy owners.
The fix, step by step
- Find and fix any leaks first: the accumulator cover and the drain bolt are known spots.
- Drop the pan, replace the filter and gasket, and refill to the exact level the manual specifies.
- The gearbox is very sensitive to fill volume.
- If the history is unknown, do a few partial fluid changes rather than a pressure flush.
Tools & part numbers
- Drain pan
- socket set
- torque wrench
- fluid pump
- Dexron-III-type ATF (Liqui Moly lookup).
Where to buy the parts
Automatic transmission filterRockAuto ↗Amazon ↗
Transmission pan gasketRockAuto ↗Amazon ↗
Automatic transmission fluidRockAuto ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Isuzu Trooper (second generation) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.