Driveline Vibration at high speed - JeepForum.com
 
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post #1 of 13 Old 01-03-2010, 09:18 AM Thread Starter
johnathangaynor
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Driveline Vibration at high speed

I have a 2000 wrangler auto with a 4in SL and ford 8.8 axle and 4.88 gears and 35's. After I installed lift i had a vibration that started at about 2k rpm and gets worse from there. I am turning about 3k rpm's at 60mph. I installed a SYE and adjustable rear lower arms, checked pinion angle, replaced trans mount, added super 88 kit, and replaced tires. Nothing has helped the vibration. I have searched the forum but cant find anything leading me to whats wrong and I really don't want to take the jeep to the dealership. Any help is appreciated.

Sorry for so long

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post #2 of 13 Old 01-03-2010, 09:24 AM
NEWJeeper10
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The backlash on your ring and pinion gear in the rear axle can make a vibration that feels like your U-Joints are bad. You might also want to check the U-joints if you havent done so already
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post #3 of 13 Old 01-03-2010, 09:28 AM Thread Starter
johnathangaynor
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I have also replaced the u-joints in the rear. I bought the 8.8 axle from a guy in the off-road club I'm with and he had it under his TJ and "SAID" he had no vibs. What would be the easiest way to check the backlash?
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post #4 of 13 Old 01-03-2010, 09:34 AM
NEWJeeper10
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really, thats something you have to pay for. I mean you cant really do it yourself cause you need a special tool. I work at a garage so its easy for me. But it shouldnt cost too much cause all they have to do is take off the diff pan and use that tool to check it.
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post #5 of 13 Old 01-03-2010, 09:38 AM
NEWJeeper10
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i just thought of something esle too. If your pinion gear is not hitting your ring gear in the middle if the teeth it will cause a vibration as well
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post #6 of 13 Old 01-03-2010, 09:46 AM
durango-bob
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I would suspect that your rear driveline angles are not right. With an SYE, the rear axle pinion shaft should be parallel to the tcase output shaft. If you have these right, my next though would be that one of the ujoints is going bad or the CV joint is bad. You could also have tire/rim issues like balance, bad tire, or bent rim. I've worked on quite a few differentials and have yet to see any bad set-ups cause the vibrations you describe, so I would not be looking there for the problem.
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post #7 of 13 Old 01-03-2010, 09:47 AM
Scotch740
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All you need to check backlash is a $10 dial indicator and a magnetic stand so maybe $20 total.

As for your vibe. Try pulling your front shaft see if it goes away.

Next: Put front shaft back in, pull rear shaft. Put in 4hi and see if it goes away.

Much easier than getting into the gear set and more likely to be your problem.
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post #8 of 13 Old 01-03-2010, 09:49 AM
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Quote:
Originally Posted by durango-bob View Post
I would suspect that your rear driveline angles are not right. With an SYE, the rear axle pinion shaft should be parallel to the tcase output shaft. I...
You sure about that?

I set my diff up to be pointed at the output when I installed my SYE
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post #9 of 13 Old 01-03-2010, 09:50 AM
Dogman
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Quote:
Originally Posted by Scotch740 View Post
All you need to check backlash is a $10 dial indicator and a magnetic stand so maybe $20 total.

As for your vibe. Try pulling your front shaft see if it goes away.

Next: Put front shaft back in, pull rear shaft. Put in 4hi and see if it goes away.

Much easier than getting into the gear set and more likely to be your problem.
Agreed...

I had a similar issue that was driving me crazy. I finally figured out the nut on my rear output shaft (transfer case) was a little loose.

John 3:17
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post #10 of 13 Old 01-03-2010, 10:09 AM
NEWJeeper10
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Quote:
Originally Posted by Scotch740 View Post
All you need to check backlash is a $10 dial indicator and a magnetic stand so maybe $20 total.

As for your vibe. Try pulling your front shaft see if it goes away.

Next: Put front shaft back in, pull rear shaft. Put in 4hi and see if it goes away.

Much easier than getting into the gear set and more likely to be your problem.
HAHA sorry, maybe its not so much. I thought different for the tool but thats Snap-On for ya i guess
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post #11 of 13 Old 01-03-2010, 11:00 AM
Hella
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Quote:
Originally Posted by Scotch740 View Post
You sure about that?

I set my diff up to be pointed at the output when I installed my SYE
x2....Yeah should be approx 2 degrees below pointing at output i believe

04 TJ "Leyla" Rubi..
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post #12 of 13 Old 01-03-2010, 11:24 AM
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With non leaf spring vehicles, you pinion doesn't need to be pointing below the output. You can be pointing directly at the output with no harm. As long as you're not above the drive shaft angle, things will be fine.

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post #13 of 13 Old 01-03-2010, 08:14 PM
NEWJeeper10
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Quote:
Originally Posted by Hella View Post
x2....Yeah should be approx 2 degrees below pointing at output i believe
x3. I only set mine 1 degree cause when you have a non leaf spring vehicle you DO have to compensate for axle roll when torque is applied cause no matter how stiff the control arm bushings are, you will get axle roll
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