Our rear springs are 9″ longer than factory (’79-’88) rear springs. Mounting these longer springs will require new front spring hangers and relocation of the rear shackle hangers on pre-’89 trucks. Our rear springs have 8 leaves, plus a special torque leaf to reduce axle wrap. Springs come with new poly bushings. Rear spring rate is 200 lbs force sq/in. We do not have stock length rear springs available.
When installing the same lift onto a 4 Runner, the rear springs will need to be 1″-2″ taller than the front to compensate for the added weight of the vehicle. 1984-1989 4 Runners weigh an average of 700lbs more than the pickup because of the hardtop, glass, interior components, roll bar, heavier tailgate and power window assembly inside, and other components. If you always run your 4 Runner empty in back, a 1″ taller rear spring will generally be enough to level it with the front. If you carry spare parts or extra passengers in back we recommend a 2″ taller spring than the front.
* NOTE: These springs are NOT designed for weight carrying capability. They are designed for ride quality and flex. If you intend to use the vehicle for carrying weight, we recommend adjusting the bumpstops to prevent bottoming out and damaging the shocks or springs and adding airbags or other support devices.