Cab corner rust is a nearly universal issue on 1947–1972 Chevy trucks. The cab corners collect moisture behind the B-pillar and behind the running boards. Here’s how to address it.
Assess the Damage First
Before you start cutting, probe around the rust with a screwdriver. If the metal flexes or punctures easily, the rust is deeper than surface level. Check the floor, kick panels, and firewall while you’re at it.
Patch Panel Option – Best for Light to Moderate Rust
If the rust is limited to the corner itself and the surrounding metal is solid, a patch panel weld-in is the most cost-effective approach. Patch panels are available for most classic C10 year ranges from $40–120 each.
Key tools: angle grinder, cut-off wheel, MIG welder, body hammer, and filler for finishing.
Before welding, treat the inner surfaces with 3M Weld-Thru Coating II — it protects bare metal at weld zones from future rust.
Full Panel Replacement – Best for Severe Rust
If the cab corner, door jamb, or floor rail is compromised, do the full replacement now. Half-measures on rust always come back to bite you.
Prevention After Repair
Once welded and painted:
- Use Rust-Oleum 2-in-1 Rust Reformer on any marginal areas
- Apply spray undercoating to inner cab surfaces
- Seal all body seams with seam sealer before paint
Post your before photos — let’s see what you’re working with.