Symptoms
Almost 4 inches of sag at the hitch with a 5,000 lb trailer and about 600 lb of tongue weight, even with weight distribution set up.
The fix, step by step
- Raise and support the rear, then disconnect the rear shocks so the axle can drop.
- Fit the air bags inside the rear coil springs, route the air lines away from heat, and add an onboard compressor with a union tee if you want to adjust them from the cab.
- Reconnect the shocks; the owner needed a long steel bar to compress the suspension enough to line them up.
- Run about 35 psi when towing.
Tools & part numbers
- Jack stands
- long pry bar
- Firestone 4164 air-bag kit
- Air Lift 25804 compressor
- Air Lift 21838 union tee
- RTV
- zip ties
- marine grease.
Where to buy the parts
Firestone 4164 air helper spring kit (search)Summit Racing ↗
Air Lift 25804 on-board compressor (search)Air Lift Company ↗
Air Lift 21838 union tee (search)Air Lift Company ↗
Hunting a used or discontinued part? Search eBay Motors for Toyota Land Cruiser 200 Series 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.