Vibs in drive shaft.

94laredo · Nov 17, 2006

After putting my 4.5" lift, I had some vibration in my drive shaft, I drive a full time fwd ZJ. Now, since I changed the gears I have even more vibrations when easing off the throttle (slightly easing off) on the highway. When totally letting go, it doesn't do it. Is there something I could do?

2000_WJ · Nov 17, 2006

tc drop kit

94laredo · Nov 17, 2006

Been there, done that LOL. 1", still does it!

CrawlerReady · Nov 17, 2006

Sounds like you've got a u-joint going bad on one of your drive shafts...more than likely the rear shaft.

MCracco · Nov 17, 2006

Basics first. Are you sure it's the rear shaft? If it's the rear, what type of shaft is it and what does the pinion angle look like?

CrawlerReady · Nov 17, 2006

MCracco said:
Basics first. Are you sure it's the rear shaft? If it's the rear, what type of shaft is it and what does the pinion angle look like?

I was the one that said more than likely it's the rear shaft...he just said it was the driveshaft. That personally just sounds like a u-joint failing.

94laredo · Nov 17, 2006

So its clear, I'm having problems with the front, not the back. I changed the ujoints before installing the kit, so I doubt its that. How many of you drive an full-time without vibrations?

biggerpapa · Nov 25, 2006

i drive a full time fwd and put a 3.5 RE on last weekend. it has no vibration but does have more of a mechanical sound that is heard loudest at 40-50 MPH. Because of the change in the driveline angle it is much easier to get vibs.

biggerpapa · Nov 25, 2006

one more thing... i think it may be coming from the front drive shaft (at least on mine)

gonecheenin · Nov 25, 2006

Does your front shaft have a CV at the front axle or a standard u-joint?

If its a standard U-joint and your shaft is in good shape mechanically (no worn slip splines or anything damaged/out of balance) thats were your vibration is from

First off:
Any U-joint running at an angle makes a vibration
2 U-joints running at the same angle on the same shaft make 2 equal vibrations which cancel each other out

The Grand's stock Spicer style CV at the T-case has two U-joints in it which cancel their own vibrations, so when you lift the Jeep & the axle side u-joint starts running at an angle you now have a vibration that isn't being cancelled

Only six choices to fix your issue;

1) lose some caster to improve pinion angle & help reduce the vibration
2) install an XJ/MJ HP30 front diff to improve pinion angle
3) have front end cut & rotated to improve pinion angle
4) install a standard 2 joint shaft (like a YJ) so you can more closely match your axle side joint angle to the T-case side joint angle
5) have a custom front shaft made with two Spicer style CV's in it
6) run without front shaft

Personally I go with either #2 or #4 on my ZJ's

94laredo · Nov 26, 2006

Help for all the suggestions, they are greatly appreciated!!

Vibs in drive shaft.

94laredo

2000_WJ

94laredo

CrawlerReady

MCracco

CrawlerReady

94laredo

biggerpapa

biggerpapa

gonecheenin

94laredo

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