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Old 03-07-2012, 06:39 AM   #1
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Cam Bolt Kit

Hello,
I have a 2004 stock (never had any lift kits or other modifications) TJ 4.0ltr. 5 spd 85K miles that has a drive train vibration at around 50mph plus. When going that fast in neutral (no tork) it rides just as smooth. I have had the driveshaft checked for balance and new u-joints in rear and rear end rebuilt with new bearings. I have been told that my pinion angle looks off by the driveshaft guy but he said to get another opinion. Someone recommended putting on a Rear Pinion Cam Bolt Kit to change the pinion angle. I would like to hear the opinions and suggestions from you guys out there? I want to keep the jeep stock. Thanks in advance,
George

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Old 03-07-2012, 10:14 AM   #2
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I'd be surprised if a cam bolt kit would be able to change your pinion angle enough unless it just needs a very small adjustment.

What I'd do first is verify where exactly this vibration is coming from. Remove your rear drive shaft, shift into 4-HI, and go for a test drive to see if the vibration is gone. If it's not gone, you know it's somewhere else. You can also remove your front shaft and go for a drive to see if it's causing any vibrations. Once you are able to say with certainty what is causing the vibration, the fix should be more apparent.

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Old 03-07-2012, 10:19 AM   #3
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Could be unbalanced tires or a bent wheel? Cam bolts have a way of coming out of adjustment. If it truly is attributed to your drive line angle, I would just drop the transfer case skid a tad with a couple of washers or if you don't want to lose belly clearance - install a motor mount lift. Prior to either suggestions, I'd follow geiman's advice and remove the shaft to pinpoint cause.
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Old 03-07-2012, 10:40 AM   #4
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Since your TJ is stock and unlifted, your rear pinion angle is fine. It cannot get out of adjustment with stock control arms unless something is bent. Your vibes are caused by something besides the rear pinion angle.

Vibes could be anything from an unbalanced tire to a bent wheel to mud inside a wheel, or perhaps a bent driveshaft or bad u-joint. But not from a bad pinion angle... don't install cam bolts to try to change it.
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Old 03-07-2012, 10:48 AM   #5
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Quote:
Originally Posted by Jerry Bransford View Post
Since your TJ is stock and unlifted, your rear pinion angle is fine. It cannot get out of adjustment with stock control arms unless something is bent. Your vibes are caused by something besides the rear pinion angle.

Vibes could be anything from an unbalanced tire to a bent wheel to mud inside a wheel, or perhaps a bent driveshaft or bad u-joint. But not from a bad pinion angle... don't install cam bolts to try to change it.
Why is the ride smooth at 50mph when put into nuetral? Would the ride still be rough if it were the wheels?
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Old 03-07-2012, 10:57 AM   #6
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That is why I said vibes can be caused by anything from an unbalanced tire to a bent wheel to mud inside a wheel, or perhaps a bent driveshaft or bad u-joint. Whatever is causing the vibration, it's not from a bad pinion angle.

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