Symptoms
Scale on the frame, suspension arms and hub-reduction housings. BaT sellers keep finding it: rust on the underside of several civilian trucks, visible rust on the underside components of a BXD10 soft-top, an underbody painted black over earlier rust, and one truck that needed rust repair before its repaint.
The fix, step by step
- Wash the underside and let it dry.
- Probe the frame, suspension mounts and hub-reduction housings for scale and pitting, and get anything structural looked at before you coat it.
- Wire-brush loose rust back to firm metal, apply a rust converter, then prime.
- Spray cavity wax inside the frame rails and an underbody wax over the visible underside, keeping it off brake parts and exhaust.
- Recheck every year.
Tools & part numbers
- Pressure washer
- wire brushes and a wire wheel
- heavy-duty jack stands
- cavity-wax wand
- protective gear.
Where to buy the parts
Bilt Hamber Hydrate-80 rust converterBilt Hamber ↗Amazon ↗
Bilt Hamber Dynax-UB underbody waxBilt Hamber ↗Amazon ↗
Bilt Hamber Dynax-S50 cavity waxBilt Hamber ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Toyota Mega Cruiser 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.