Symptoms
Wet or crunchy carpet, holes under the driver's floor mat, bubbling under the woodgrain, rotten rockers that can let exhaust into the cabin.
The fix, step by step
- Pull the seats and carpet and wire-brush everything so you can see the full extent.
- Cut out rot back to clean metal, then trial-fit and weld in repair sections: front driver's and passenger's floor, rear sections, rockers, dog legs and lower quarters.
- Seam-seal and undercoat.
- On the outside, remove the woodgrain before welding and put down fresh vinyl afterward.
Tools & part numbers
- MIG welder
- cut-off wheel
- spot-weld drill
- clamps
- weld-through primer
- seam sealer
Where to buy the parts
Front floor pan, driver's-side section, 1963–1991Team Grand Wagoneer ↗Amazon ↗
Rocker panel, 4-door models, 1963–1991Team Grand Wagoneer ↗Amazon ↗
Lower quarter repair panel, 1963–1991Team Grand Wagoneer ↗Amazon ↗
Marine Teak woodgrain vinyl kit, 1987–1991Team Grand Wagoneer ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Jeep Grand Wagoneer (SJ) 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.