RodderMods

Chassis stiffening

1960–84 Toyota Land Cruiser FJ40 chassis stiffening

3 kits to stiffen the frame, from frame rails and connectors to braces and roll bars.

How it's built
Body-on-frame, steel ladder frame
Weak spots
The body tub rusts badly in the floors, rear corners, door bottoms and around the wheel wells, and the rear frame crossmember and frame rails rot. Leaf springs sag, shackles and spring bushings wear, and knuckle seals and steering boxes leak and wear.

Stiffening kits

Prices checked Oct 14, 2026

AreaKitWhat it isPrice
Frame rails RuffStuff Specialties FJ40 Frame Boxing Kit (R1129) Weld-on boxing plates to reinforce FJ40 frame rails. See source Product page would not load for price check Source
Structural repair panels Cruiser Solutions FJ40 Rear Crossmember-1980-1984 Bolt-in 1/8 in steel rear crossmember; Toyota no longer sells it. $379.95 Listed price Source
Structural repair panels CruiserParts FJ40 Rear frame cross member 1/1979-1984 (51209-60030-A) New reproduction rear crossmember. $384.99 Listed price Source

Prices are from the linked seller pages and change often. Confirm fitment for your exact year and body style before ordering; many weld-in parts need professional installation. Some links earn us a commission.