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Unread 07-14-2013, 12:34 AM   #1
hondakilla98
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1998 ZJ 
 
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RE 3.5" super ride lift pinion angle?

I have an RE 3.5" super ride lift with .75" coil spacer in the rear. I'm sitting at 22" HTF. My rear lower control arms are set at 17.25"(recommended length in the RE instructions), the uppers are stock. I've noticed a vibration while I'm driving that's worse when I'm on the gas. My pinion angle looks a little off. Should I shorten the arms or get adjustable uppers?

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5.9 Limited, RE 4" lift, RE FTB, JK take offs w/ 255/75/17 BFG MT's, 1.25" wheel adapters, ARB Bumper, Superwinch LP10000, K&N intake, Flowmaster, custom JL & Focal stereo, 20% tint, KOR roof mount tire carrier, JCR sliders, cobra 75 wx st
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Unread 07-14-2013, 08:37 AM   #2
hondakilla98
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Here's a pic.


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5.9 Limited, RE 4" lift, RE FTB, JK take offs w/ 255/75/17 BFG MT's, 1.25" wheel adapters, ARB Bumper, Superwinch LP10000, K&N intake, Flowmaster, custom JL & Focal stereo, 20% tint, KOR roof mount tire carrier, JCR sliders, cobra 75 wx st
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Unread 07-14-2013, 08:49 AM   #3
OverlandZJ
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You need to pick up an angle finder, cheap at Sears or likewise.

On non SYE the transfer output angle should match the pinion, less 1-2 degrees to compensate for load.

On an SYE rig you point the pinion directly to output.. again minus the 1-2 degrees.
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Unread 07-14-2013, 08:52 AM   #4
OverlandZJ
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Disregard the leaf and shim in this, but it shows how the angles should match on the transfer and pinion for non SYE.

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Unread 07-14-2013, 08:59 AM   #5
PolkaPower
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That looks good for the rear. For the front you want the pinion to be pointed straight at the t case.
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Unread 07-14-2013, 09:30 AM   #6
hondakilla98
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I had a friend look at it that's a mechanic and he thinks it's too steep. The only thing that's changed since I noticed the new vibration is swapping the lower control arms front to back. Because the previous owner installed them in the wrong location. So they are 1" longer than before. Which would point the pinion downward from where it was.
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5.9 Limited, RE 4" lift, RE FTB, JK take offs w/ 255/75/17 BFG MT's, 1.25" wheel adapters, ARB Bumper, Superwinch LP10000, K&N intake, Flowmaster, custom JL & Focal stereo, 20% tint, KOR roof mount tire carrier, JCR sliders, cobra 75 wx st
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Unread 07-14-2013, 09:31 AM   #7
hondakilla98
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Location: Beaverton, or
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I have one of these that I could measure the difference with.


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5.9 Limited, RE 4" lift, RE FTB, JK take offs w/ 255/75/17 BFG MT's, 1.25" wheel adapters, ARB Bumper, Superwinch LP10000, K&N intake, Flowmaster, custom JL & Focal stereo, 20% tint, KOR roof mount tire carrier, JCR sliders, cobra 75 wx st
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Unread 07-14-2013, 09:41 AM   #8
PolkaPower
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Shorten the arms a little and see if it goes away.
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Unread 07-14-2013, 09:45 AM   #9
newfieZJ
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Time to experiment with the angle a little . Try a little less length on the CA's , drive it , change it longer if the vibes get worse . Just count the revolutions you adjust and match the other side .

Problem could also be at the slip yoke . Move that axle back and the yoke now sits further back on the output shaft . This can definitely cause issues with vibs . IMO , I'd shorten the arms to 17" to start . I once had a stock arm on a 4.5 lift with only higher speed vibe issues . If the case , SYE and a new drive shaft . I'm kinda thinking you should be able to get it better than it is adjusting the arms .
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