Installing adj. UCA and setting pinion angle - Jeep Wrangler Forum

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Old 07-03-2012, 08:06 PM   #1
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Installing adj. UCA and setting pinion angle

I have a 2005 Wrangler UNLIMITED, with 3.5" Rock Krawler short arm suspension lift. The kit came with lower adjustable control arms all the way around. I just installed my SYE/CV and my pinion angle is a little higher then my driveline angle. I guess I will have to install adj. UCA on the rear. Anyone have a good write-up on installing the rear UCA's and setting pinion angle?

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Old 07-04-2012, 08:49 PM   #2
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you need adjustable uppers AND lowers that can adjust shorter than stock, in order to align your rear pinion angle.

set pinion pointing parallel with the driveshaft, such that there is a -1 to 0° difference between the two, at ride height.

while doing this, you need to ensure the axle is centered at full bump, with the springs removed, and proper bumpstop extensions installed. This means lengthening the uppers and shortening the lowers. You're not losing wheelbase. Adjusting uppers only will push the pumpkin back into the gas tank, create track bar interference problems and put the tire into the rear wheelwell.
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