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Old 10-05-2010, 11:23 PM   #1
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Pinion angle

I have a 2000 tj 4.0 auto with a 4" pro comp stage 1 lift, it has a harsh vibration on take off, the whole jeep shakes but only on take off. They also installed a 1" t-case drop. How do you know if the pinion angle is correct and if not how can you correct it on a low budget. I know that the sye and cv axle would correct it according to the post I've read on here. Is there any other options??? Thanks

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Old 10-05-2010, 11:39 PM   #2
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The pinion shaft angle is not correct since it hasn't been adjusted. Dropping the t-case 1" typically isn't enough to cure the vibrations caused by a 4" lift. The next step would be to also install a set of 1" taller motor mounts which will add to the effect of the 1" t-case drop. The two together will probably (!) be enough to stop the vibrations. The only other options are to drop the t-case another inch or, better, install a SYE kit and CV driveshaft and get rid of the t-case drop altogether.

4x4 shop personnel that sell and install 4" lifts without fully disclosing the problems such a tall lift will cause without the customer spending more $$$ than was originally disclosed (usually purposely)should be hung, shot, or tortured.

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Old 10-06-2010, 12:44 AM   #3
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I have a friend with a 1" MML for $45, I can probably do like $50 shipped for it if you were interested. Just shoot me a PM.

However, really the best way is a SYE/CV combo. And you shouldn't have to worry about installation because it's honestly not too difficult a task. Time consuming, but there are numerous fantastic videos. Just follow along and take your time. Rent your tools from AutoZone. Other tools like a hydro lift are simply a necessity in a garage.

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$$$ than was originally disclosed (usually purposely)should be hung, shot, or tortured.
Agreed. But it's always difficult to judge what's going to happen at 4". Most have no problems, some have numerous problems.
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Old 10-06-2010, 12:46 AM   #4
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I'd have to say that where a TJ is concerned, 4" is where the excessive u-joint angle problems start. Unlimiteds can go that height without much issue but not the shorter wheelbase TJ.
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Old 10-06-2010, 06:54 AM   #5
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Quote:
Originally Posted by Jerry Bransford
I'd have to say that where a TJ is concerned, 4" is where the excessive u-joint angle problems start. Unlimiteds can go that height without much issue but not the shorter wheelbase TJ.
Anyone know of a good 4x4 shop in western ky, that could install an sye/cv combo?
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Old 10-06-2010, 11:18 PM   #6
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Here's some photos
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Old 10-07-2010, 10:53 AM   #7
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Has anyone somehow raised the rear axle's pinion angle? It looks too high and when it is too high, that causes drivetrain vibrations. Especially during takeoff.
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Old 10-07-2010, 11:22 AM   #8
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Not sure if it's been messed with or not, I'm new to the jeep thing and don't have a clue, all the work was done before I bought it, it was installed at 4wd store in Nashville, tn and I live about 2 hrs from there. Could a alignment shop adjust the pinion angle?
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Old 10-07-2010, 11:29 AM   #9
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Can you post two more photos showing your rear control arms? One of the bottom control arm and one of the top control arm. A third photo, fairly close with a flash if you can, showing the frame-end of the upper rear control arm where it bolts to the frame's mounting bracket too if you can.
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Old 10-07-2010, 09:29 PM   #10
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I will post some more photos on Saturday, thanks for taking the time to answer my post

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