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1979-1995 Toyota 4x4 Builder's Guide - How To Trail Your Toyota
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1979-1995 Toyota 4x4 Builder's Guide - How To Trail Your Toyota
In 1990, the second-generation 4Runner was introduced, and it featured a coil spring four-link rear suspension.
The rear spring perches and U-bolts can be replaced with a spring perch kit from All-Pro. The unique design of this setup keeps all of the bolts and hardware above the axletube away from obstacles and potential damage.
Solid-axle rigs can gain suspension travel using a weld-on long-travel front shock hoop. The hoop shown here is from All-Pro Off-road. Hoops are available for early solid-axle rigs and late-model SAS trucks and 4Runners.
Weld-on differential armor is available to protect the axlehousing. Note the cutout for the oil fill/drain.
Four popular Toyota diffs from left to right are the 8-inch four-cylinder diff, 8-inch four-cylinder with ABS, Turbo/V6 8-inch diff, and Turbo/V6 8-inch diff with ABS. Note the increased gusseting on the Turbo/V6 diff.
The Toyota models discussed in this article used three different steering gears. Shown left to right are the '79-'85 gear, the '86-'88 IFS 4x4 gear, and the '89-'95 IFS 4x4 gear. The '89-'95 gear received a different sector shaft and is a quicker ratio than the '86-'88 gear. Both IFS steering gears are also plumbed for power steering coolers. The IFS steering gear is used for SAS applications and to achieve crossover/high-steer setups in early-model trucks.
The stock drag link in '79-'85 models is relatively weak and another reason that high-steer and crossover steering setups have become so popular. Also shows the push/pull style-box that moves the drag link forward and back.
'79-'83 pickups used a torque rod mounted between the front axle and the frame to control axle windup. A torque rod extension bracket or adjustable torque rod is required when more than 3 inches of lift is installed. The stock drag link is shown installed between the leaf spring and the frame. The early push/pull steering box is also visible just above the frame.
The early steering gear pushes and pulls the drag link to turn the wheels via the J-arm. The J-arm is the steering arm shown on the driver-side steering knuckle. The rear of the arm attaches to the drag link and front of the arm attaches to the tie rod.
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