Symptoms
Lug nuts that won't thread on, studs that snap when a tire shop uses an impact gun, or a wheel that loosens. Owners have reported all three to NHTSA.
The fix, step by step
- Support the truck safely and pull the wheel.
- On the front, remove the caliper and rotor to reach the back of the hub; on the rear, pull the drum.
- Drive out the damaged stud, clean the hub, then draw the new stud in with a stack of washers and a lug nut, or press it in, until the head seats fully.
- Fit new lug nuts with any damaged studs, start every nut by hand and torque them to the factory spec in a star pattern.
- Tell your tire shop to do the same.
Tools & part numbers
- Hammer and punch or a stud press
- washers
- torque wrench
- factory torque spec confirm in manual.
Where to buy the parts
Brake and wheel-hub parts catalog, 1990 Trooper 2.6RockAuto ↗
Wheel bearing (if the hub is apart)RockAuto ↗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.