Driveline Vibration AFTER MML - JeepForum.com

 
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post #1 of 11 Old 05-29-2007, 01:29 PM Thread Starter
nfunlimited
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Driveline Vibration AFTER MML

So I installed a MMl, and a 1.25" bl from JKS. I now have a driveline vibration at about 90km/hr (50 miles or so). It seems to go away if I put the clutch in. Has anyone experienced this before? The rear angle is almost perfectly straight since I only have the 2" bb, and have the LWB LJ. It seems that now that the tcase is tilted, the front is at a bit of an angle....could this be the cause??

One more thing. The dealership recently replaced the rear end pinion seal. Is there anything they could have done to cause a vibration?

Thanks for any help you can give.

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post #2 of 11 Old 05-29-2007, 01:35 PM
mdm
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Why did you install the MML? Did you have drive train vibration after installing the 2" BB? You shouldn't have needed to install the MML on the LJ for just a 2" BB.
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post #3 of 11 Old 05-29-2007, 01:51 PM
RockRunner85
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Remove the MML or lift the Jeep higher.

2004 Black Rubicon w/ 5 spd

RE 3.5 SuperFlex & Front Trackbar / JKS 1.25" BL & MML / 35x12.5 MTRs on 15x8 AR-23s / Currie Anti-Rock / Jeeperman Bumpers / Rokmen Sliders / York OBA / Harbor Freight 8k Winch
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post #4 of 11 Old 05-29-2007, 02:13 PM Thread Starter
nfunlimited
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I installed the MMl along with a Bl to clear larger tires. I also plan to add a tummy tuck, and will need the MMl to do so.

Wouldn't removing the MML just be the easy way out? Lots of people runs this setup....I'm asking to see if anyone has run into vibs before, and is aware of a problem, or knows of anything I can fix
.
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post #5 of 11 Old 05-29-2007, 02:16 PM
RockRunner85
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Quote:
Originally Posted by nfunlimited
I installed the MMl along with a Bl to clear larger tires. I also plan to add a tummy tuck, and will need the MMl to do so.

Wouldn't removing the MML just be the easy way out? Lots of people runs this setup....I'm asking to see if anyone has run into vibs before, and is aware of a problem, or knows of anything I can fix
.
Adding the tummy tuck should counter act the MML and fix your vibes. Otherwise you could get upper adjustable control arms and rotate the pinion angle. You need the angle on the tcase and pinion to be the same to have no vibes. Since you didn't lift it that high and you have an LJ with the longer driveshaft thats why your having vibes.

2004 Black Rubicon w/ 5 spd

RE 3.5 SuperFlex & Front Trackbar / JKS 1.25" BL & MML / 35x12.5 MTRs on 15x8 AR-23s / Currie Anti-Rock / Jeeperman Bumpers / Rokmen Sliders / York OBA / Harbor Freight 8k Winch
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post #6 of 11 Old 05-30-2007, 11:56 AM Thread Starter
nfunlimited
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The rear driveshaft is in a straight line with 0 degrees angle. I didn't have any vibs with just the BB, and the angle is less now with the MMl, so wouldn't the vibs be less?

Is it possible the front driveshaft is the culprit???? Even when driving in 2 wheel drive?
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post #7 of 11 Old 05-30-2007, 12:01 PM
bluehdmc
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[quote=nfunlimited]The rear driveshaft is in a straight line with 0 degrees angle.

That in itself could be the cause of your vibration, U-joints are supposed to have some offset, I'm not sure of how many degrees is necessary but they are not supposed to be straight. After you put you tummy tuck in you'll restore some offset to the u-joints.

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post #8 of 11 Old 05-30-2007, 12:13 PM
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[QUOTE=bluehdmc]
Quote:
Originally Posted by nfunlimited
The rear driveshaft is in a straight line with 0 degrees angle.

That in itself could be the cause of your vibration, U-joints are supposed to have some offset, I'm not sure of how many degrees is necessary but they are not supposed to be straight. After you put you tummy tuck in you'll restore some offset to the u-joints.

I really can't buy that. If your dealer removed your yoke to change your pinion seal then maybe they didn't retighten it properly. Does it make any whining noise
? Listen carefully before you answer. If so, take it back to them and tell them about it.

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post #9 of 11 Old 05-31-2007, 07:29 AM Thread Starter
nfunlimited
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I haven't noticed any whining noise. However, I will listen again before I confirm that. I was wondering if maybe when the dealer reinstalled the yoke, they didn't line the splines up in the same location they were. Would that cause a vibration?

The vibration is not a wobble or anything, but definately a new sensation. I have had a loose rear yoke strap on a yj, and I am familiar with the type of uncontrolable wobble that gave.

Thanks....this is really a help
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post #10 of 11 Old 05-31-2007, 07:33 AM
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Did I read your profile right that you have the MML in the front and the BB is only on the rear with the front suspention stock?

2006 Jeep TJ X Modded with toys
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post #11 of 11 Old 05-31-2007, 02:14 PM Thread Starter
nfunlimited
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I have ACOS in the front, and the 2" spacers in teh rear. The ACOS is for the weight of the winch. It sits the same as a 2"bb with no winch

My profile could be wrong though.
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