Toyota Land Cruiser 70: 79 Dual Cab Rear Chassis Rust at Spring Hangers

The 79 Series dual cab (double cab) has a known weakness with rust forming on the rear chassis rails around the leaf spring front and rear hanger brackets. This area accumulates mud and moisture, particularly on the inner faces of the chassis rails where the bracket welds are located. The dual cab body also creates a partial enclosure at the rear that traps moisture. In NZ and AU conditions involving farm use, dirt roads, river crossings or coastal environments, the rust can progress from surface corrosion to structural pitting and perforation of the chassis wall, which is a warrant-of-fitness (WOF) or roadworthy failure item. Repair can range from surface preparation and coating to section welding or chassis rail repair in severe cases.

• Visible rust or bubbling paint on rear chassis rails near spring hangers
• Flaking rust or orange streaking below the chassis at the rear
• Soft or pitted metal when probed at spring hanger weld zones
• WOF or roadworthy failure for structural corrosion
• Visible perforation or holing of chassis rail inner face

1. 1

   Get under the rear of the vehicle and inspect both chassis rails from the rear axle rearward, focusing on the front and rear spring hanger bracket weld areas.

2. 2

   Use a screwdriver or pick to probe the inner and lower faces of the chassis rail for softness or perforation.

3. 3

   Clean away any mud accumulation to expose the base metal.

4. 4

   Check if the chassis has been painted, coated or wax-injected previously.

5. 5

   Look for any evidence of previous patch welding.

Parts involved: Chassis and structural rust.

$800 to $6,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the vehicle been used in farming, beach, or river-crossing environments?”
• “Has the chassis ever been inspected, painted or rust-proofed?”
• “Has the vehicle had any WOF issues related to the chassis or suspension mounts?”
• “Is there any previous repair history to the rear chassis?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.