We recommend undersizing the bushing bore every so slightly so that the kingpin fits tight during assembly - if the kingpin fitment is loose, the bushing will have to be replaced. Frequently check with micrometer and kingpin. VIN Verification Service Item VIN part verificaion is a service that we provide free of charge when a part is purchased. It took about 10 minutes to hone each bushing to the proper inside diameter. It's self-centering, very forgiving, and removes material slowly. Without keeping the reamer straight, there is a high risk of over-reaming and/or cutting the bushing crooked.Ĭase in point, we used a brake cylinder hone in place of a reamer. Technically, king pin bushings are supposed to be reamed out using a special reamer in a fixture that attaches to the knuckle and keeps the cutting bit perfectly perpendicular to the face of the bushing.Subtract the two and you'll have an idea of how much material needs to be removed. Use a micrometer to measure the inside diameter of each bushing. The ACDelco king pins are 1.792" diameter. The bushings must now be reamed out to fit the king pin itself.Services both king pins, driver and passenger side. The wheel bearings are somewhat expensive on the C3500HD do to its GVWR but they should not be reused. In later iteration of axles, they were replaced by ball joints however, the kingpin variants have remained the more sought-after specimens for their off-road ruggedness, ease of high-steer arm. Additionally, you will need to replace the inner and outer wheel bearings before reinstalling the wheel hub assemblies. King pins are always replaced in pairs, never on one side or another. Before assuming that the king pins are to blame for steering issues, inspect the condition of the ball joints at the steering knuckles and tie rod assemblies. Worn king pin bushings typically result in erratic side-to-side movement of the tires, difficultly keeping the truck driving in a straight path (wandering), and excessive play in the steering system. King pin axles are obsolete in cars and light trucks as independent front suspension provide far better ride quality. A king pin is a very simple, reliable pivot system with the ability to withstand a significant amount of weight - thus they are the steering axle system of choice in the medium and heavy truck segments.
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