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Originally Posted by sodirty
over the weekend i installed 2" spacers all the way around and while I was under there I realized I have medium duty OME's which ended up giving me 3" total. Ive got nasty vibrations up front when i accelerate or turn. Im guessing its the U-joints? What is the cheapest wisest way to go about rectifying my problem? Any help is appreciated. Thanks!
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You need a double-cardan front driveshaft. Lifting that far, the front driveshaft is at just too much of an angle for the u-joints to work smoothly. You pretty much need to replace it, because it's under stress now and will fail. The DC joint can handle double the angle of the standard U-joint.
Great Basin Rovers has them for $400. It's a bolt-on deal, easy to swap.
Other suppliers may have them cheaper.
You may have a separate problem, which is that having lifted it that far, the front pinions are at a different castor angle relative to the ground. You may have some substantial tendency to wander on the highway. There are a few solutions to this. The only inexpensive one is to put in offset radius arm bushings, but that binds up the front end and makes it lose flex (and you've already lost some during the lift). If you put a TrueTrac in the front, it may reduce the problem enough that you can deal with it, but differential upgrades are expensive. You can use offset radius arms, but those too are expensive.
