1. Front or rear wheel bearings?

Fronts are like any other floating axle, remove wheel/tires, remove brake assm., remove locking hub assm., remove c-clip for CV shaft, remove retining screws and inner lock assm., pull hub off and go. The bearing races are press fit.

Rears are easier, pull wheel/tire, pull drum, drain oil, pull brake backing plate and yank. The axle and bearing will follow as a unit.

2. The idler and pitman arms are on opposite sides of the chassis and control the motion of the drag link. The pitman arm is attached to the steering box. The idler arm pivots on a sub-assembly with wear-prone bushings.

You likely will not have issues with driveshafts. Many here wheel these little trucks with 33 or 35 inchers. One even goes mudding with 38.5s with all stock drivetrain.

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Russell