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Old 06-22-2014, 06:43 PM
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Zone 3 inch suspension and body lift question?

with this lift do I need alignment cams kit? And a rear pinion cam locks?

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Old 06-22-2014, 06:55 PM   #2
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You shouldn't need either. I also would never run cam lock kits in the rear. You may have some driveline vibrations with the 3" lift kit. Some do, some don't. If you do, either a Motor mount lift with a few washers between the frame and transfer case skid or a transfer case drop should solve your problems.

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Old 06-22-2014, 06:56 PM   #3
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No alignment (caster adjustment) cams would be needed for the front. A 3" suspension lift doesn't reduce the front axle's caster angle enough to require changing it.

You don't want to use cam bolts in the rear to adjust the pinion angle since it's not really the pinion angle itself that causes vibes with a 3" lift. Drivetrain vibrations are caused by excessive drivetrain angles at the rear driveshaft's front & rear u-joints which causes the u-joints to vibrate.

With the stock rear single-cardan driveshaft, the pinion shaft & t-case output shaft angles are supposed to be parallel to each other or vibes will occur. So changing the rear pinion angle with cam bolts is not the way to correct the excessive drivetrain u-joint angles caused by the suspension lift. The correct to do that is with a SYE kit and longer rear CV (double-cardan) driveshaft, or by dropping the t-case skidplate with spacers. A 1" MML (motor mount lift) is not normally enough to counteract the steeper angles caused by a 3" lift so if the cost of installing a SYE kit and longer rear CV driveshaft is out of financial reach, just drop the t-case 1" with a spacer kit which will cure the vibes caused by a 3" suspension lift.

Not to mention that aftermarket cam bolts made for the rear have a serious problem holding the angle they are set to. They often have to be welded so they can hold the position they need to be at.

P.S. While Unlimiteds generally don't experience vibrations from a 3" suspension lift due to their longer wheelbase, the short wheelbase TJ always needs something to be done, as mentioned above, to eliminate the vibrations caused by that tall of a lift.
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