MAV
Well-Known Member
- Thread starter
- #16
The control arm bushings don't rotate around the bolt. Once the bolt is tightened, they don't move. But because they are rubber, they stretch in rotation when the control arm moves up and down. So within the bushings' limited ability to stretch (which is always more than the suspension can move - otherwise, they would tear immediately), the control arm can move up and down and rotate the bushings around their center.Can you elaborate on this a bit more? Thx.
When installed from the factory, the bolt is tightened when the suspension is at normal ride height, meaning that the bushings are not stretched when the truck is sitting still at ride height. They only stretch when the suspension flexes up or down. You'll see this when you remove your knuckle from the upper ball joint. The upper control arm will spring up into its normal ride height position due to the elasticity of the bushings.
Now, when you insert a 2" spacer at the top of the shock, you've effectively moved the static ride height of the whole suspension 2" down. The control arm bushings are now in a constant state of being stretched in rotation around the mounting bolt. The only time it ever gets back to "normal" is when you hit a bump that compresses the suspension 2". The remedy for this is to loosen the upper control arm bolt so the bushings can rotate, and pull down on the control arm until it rotates a couple of inches lower. Then tighten the bolt.
The ONLY thing this does is possibly add some life to your upper control arm bushings. It's not a big deal, otherwise it would have been included in the instructions. It's just an easy procedure to do while you're in there, so I did it. The same logic applies to the lower control arm bushings, except when you loosen those bolts, you're screwing with the camber/caster alignment. If you're going to take it in to have an alignment done anyway, go right ahead.
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