Symptoms
Late or harsh shifts, a fluid smell or smoke from the exhaust manifold. On 1990–91 automatics, overfilled fluid could escape onto the exhaust (recall 90V167).
The fix, step by step
- Drop the pan, replace the filter and gasket, and refill with the specified fluid.
- Check the level exactly as the manual describes and do not overfill.
- Confirm with an Isuzu or Chevrolet dealer, or the NHTSA VIN lookup, that the recall work was done.
Tools & part numbers
- Drain pan
- socket set
- torque wrench
- funnel
- Dexron-III-type ATF (Liqui Moly lookup; it lists ≈4.5 L for the 1990–92 2.6 automatic).
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 (first 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.