Finding Vibration Source - Page 2 - JeepForum.com

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post #16 of 21 Old 06-28-2013, 02:53 PM
laybackman
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Originally Posted by idaholtby View Post
Well, your pinion angle is definitely too low. I would suggest installing shims that most kits come with and or the least favorite option.... a t-case lowering kit. The ideal option would be a SYE with a CV rear shaft, but with your size lift, this really should not be necessary. If you are thinking of going to a larger lift soon, then this would be the option to pursue. I'm thinking though that rear axle shims will get you what you need.
If you look at the picture you posted of your driveline it doesn't look right. Either the tail end of the TC has to come down or the rear end has to come up. Their angles must be complimentary.

http://jniolon.clubfte.com/driveline...nephasing.html


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post #17 of 21 Old 06-28-2013, 08:32 PM Thread Starter
TA-YJ
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I do realize that the pinion angle is a bit extreme. Im still wondering why it started making the vibes with 1" rubber mounts as opposed to the BD ones.

1992 YJ 2.5L
Engine Mods:4.0L TB, Ford Design III 19lb Injectors, Firepower Ignition System, Ford TBird Electric Fan, Pacesetter Header, Magnaflow Cat, Dynomax Super Turbo Exhaust
Suspension Mods:BDS 2" Lift, M.O.R.E. 5/8" HD Shackles, 1" Brown Dog MML
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post #18 of 21 Old 06-29-2013, 06:25 AM
laybackman
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Originally Posted by TA-YJ View Post
I do realize that the pinion angle is a bit extreme. Im still wondering why it started making the vibes with 1" rubber mounts as opposed to the BD ones.
Find out by swapping in the BD mounts!

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post #19 of 21 Old 06-29-2013, 01:44 PM Thread Starter
TA-YJ
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They were in with the new engine but the idle vibes were aggravating me so I swapped them for the lift plates. There wasn't anything close to the in gear vibes I'm getting now

1992 YJ 2.5L
Engine Mods:4.0L TB, Ford Design III 19lb Injectors, Firepower Ignition System, Ford TBird Electric Fan, Pacesetter Header, Magnaflow Cat, Dynomax Super Turbo Exhaust
Suspension Mods:BDS 2" Lift, M.O.R.E. 5/8" HD Shackles, 1" Brown Dog MML
Other:LED Tails and Herculined
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post #20 of 21 Old 06-29-2013, 03:20 PM
laybackman
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Originally Posted by TA-YJ View Post
They were in with the new engine but the idle vibes were aggravating me so I swapped them for the lift plates. There wasn't anything close to the in gear vibes I'm getting now
Did your driveshaft have any of those small counterweights on them that got knocked off. And if you removed the driveshaft and installed it in a different position that could be the problem.

Get this rig up on four jack stands and run it. See what you can see.

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post #21 of 21 Old 06-29-2013, 05:15 PM Thread Starter
TA-YJ
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It does have a counter weight I believe, but I think its still on there. Ill check. I sprayed the Ujoints and the pinion on the axle so I knew both front and rear drive shafts went in with the same orientation. Im going to try the Tcase drop tomorrow to fix the drive line angle and see how that does.

1992 YJ 2.5L
Engine Mods:4.0L TB, Ford Design III 19lb Injectors, Firepower Ignition System, Ford TBird Electric Fan, Pacesetter Header, Magnaflow Cat, Dynomax Super Turbo Exhaust
Suspension Mods:BDS 2" Lift, M.O.R.E. 5/8" HD Shackles, 1" Brown Dog MML
Other:LED Tails and Herculined
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