Centering rear axle
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JK Newbie
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When you only get one set, they do the same thing, just backwards of each other. Uppers will move the top of the housing forward or backward. Lowers will move the bottom of the housing forward or backward. For the rear axle, will you be wanting to raise or lower the pinion? Probably raise it? Which means either going longer on the uppers or shorter on the lowers. So, you either move the top of the housing back - or the bottom of the housing forward. And moving the bottom of the housing forward brings the tires even further toward the pinch seam...
If you get both sets, then you can move the entire housing forward or backward, and set the pinion where you want it. In this case, the conventional wisdom is to use the lowers to center, and the uppers to set caster/pinion.
If you get both sets, then you can move the entire housing forward or backward, and set the pinion where you want it. In this case, the conventional wisdom is to use the lowers to center, and the uppers to set caster/pinion.
#6
JK Super Freak
I did just adjustable rear uppers to correct the pinion angle and as a bonus, it moved the axle back about 1/4" closer to center.
Adjustable rear lowers are next on my list.
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Adjustable rear lowers are next on my list.
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#8
#9
JK Super Freak
The lower control arm mounts hang below the axle tube. So pushing the upper back will also move the axle tube (center of wheel) backwards also. You probably get about half as much movement at the axle tube (center of wheel) as the length you extend the upper arm back.