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Old 03-22-2013, 04:19 PM   #1
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Vibrations after MML? Any mechanics out there? Photos

I had a RC 2.5 lift with the transfer case drop on my 97 TJ 4.0 5 speed. And it drove with zero vibrations.

I installed a MML and removed the TC drop and then (before test driving it) swapped the rear RC 2.5 coils for the stock coils with a 2" BB. ( the rear was too tall with the 2.5 RC lift IMO)

So now I'm having vibrations. Both at idle and when driving.

I'm trying to figure out if the pinion angle is wrong or if there is a problem with my MML install. I used the spacer type MML and my stock mounts looked ok. It might also be my transmission mount.



Here's a photo of my rear pinion angle, Look ok from the photo?

Any advice is much appreciated. Thanks
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Old 03-22-2013, 04:33 PM   #2
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That's a really dark picture, post some.more clear ones

When you say vibrations while idling, is thay idling while parked?

IMO the MML probably wasn't enough to deal with all of your vibrations and you will likely need to change your pinion angle since you just changed you'd drivetrain (tcase, transmission and engine) angle a bunch.

I'd start with measuring your pinion and tcase output angles. U joints have a maximum operating angle which will indicate if you need to drop your tcase a little more with some washers

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Old 03-22-2013, 07:29 PM   #3
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I'd start with measuring your pinion and tcase output angles
This. Rather than guessing, measure what you have so you know where to start/ what's needed.
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Old 03-22-2013, 08:51 PM   #4
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take a look at the motor mounts themselves.

1. on both sides, make sure the cast mounts are not resting or touching the frame side of the mount anywhere.
2. how tight did you attach/torque the bolts? is it possible you over-tightened the bolts?
3. is the motor evenly centered between both mounts, in all directions?
4. if you put the trans in neutral, and rev the motor up, does the motor move in the engine compartment?
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Old 03-23-2013, 12:47 AM   #5
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I torqued them to spec but I didn't cut the 1/4" or whatever off the mount bolt. I didn't even realize you had to do that until after I had the whole mount installed and I found the directions in the box.

Where would the spacer touch the frame side? Here's a photo when I was torquing it up.

Oh yeah, I installed my MML with the fenders completely off and it was much easier to get to everything.
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Old 03-23-2013, 07:26 AM   #6
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Originally Posted by Joedinglenut View Post
I torqued them to spec but I didn't cut the 1/4" or whatever off the mount bolt. I didn't even realize you had to do that until after I had the whole mount installed and I found the directions in the box.
thats a problem.

watch the video:


did you install bumpstop extensions & check shock lengths? those shocks look way too long, which has happened before....might find this helpful too.
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Old 03-23-2013, 09:05 AM   #7
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Those are the "fabulous" RC complete 2.5 kit!!


I'm trashing those front springs and shocks and going to a correct length Bilstein shock with a 2" BB setup. I realized a BB will drive my jeep over all the simple trails I go on. I've read tons of your post Unlimited on bump stops and I think I'll have a setup that will not bottom out on simple stuff now.

Anyways, yeah ill take the whole MML off, cut the bolt down, reinstall everything and double check all my torque specs.

If I'm still having vibrations after that I'm going to completely pull the MML out and go from there. I really don't want adjustable control arms even if they were free as its one more thing to endlessly fiddle with, which I don't need right now as I fiddle enough with my jeep.

Anyways I'll update when I figure out the problem. Thanks for the advice everyone.
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Old 03-05-2014, 04:14 PM   #8
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Update:

It was my incorrectly installed motor mount lift that was causing the problem

I cut the bolt and it drove great

I then felt bored and swapped it all out again but this time with new motor mounts and it drove even better. I suggest if your doing to do the work of a motor mount lift then maybe just buy new mounts at the same time. My old ones looked ok but the new oem ones were a little softer and the engine was even smoother
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Old 03-05-2014, 07:15 PM   #9
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did you loosen and retighten the trans mounts 4 nuts at the bottom of the skid so they could remove the tension from the mount also. Those 2.5" RC springs are pretty good just not RC shocks .
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Old 03-05-2014, 09:32 PM   #10
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did you loosen and retighten the trans mounts 4 nuts at the bottom of the skid so they could remove the tension from the mount
Yes I kept the nuts on the bolts but backed the nuts all the way to the ends of the bolts to get more fiddle room when doing the MML
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Old 03-05-2014, 09:34 PM   #11
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. Those 2.5" RC springs are pretty good just not RC shocks .

Yes the springs were not bad, but I like the stock coils with a BB better. They handle bettter than the RC coils. I also bought some new oem coils to replace my old sagging stock coils when I went to the BB.

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