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Discussion Starter #1
Hey all. Gonna replace my transmission mount this weekend in hopes that it gets rid of some vibrations/slight shuttering I've had when starting from a complete stop especially, though it is pretty continuous throughout acceleration.
Been looking around and since the goal here is to eliminate vibs, I'm gonna go with a rubber one rather than poly. I just wanted to double-check with some folks that what I'm thinking of ordering is the best option for an OEM fit.
If anyone knows of a better place to order one I'd be all ears!
Here is the link:
Amazon.com: DEA A2882 Transmission Mount: Automotive
Thanks!
 

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That looks correct and it's rubber which is good. But often such vibes are caused by excessive u-joint issues caused by a suspension lift. Do you have a suspension lift installed and if so, how tall is it? Did you do anything to correct the u-joint angles if there is a suspension lift installed?
 

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if you are looking at it for the purpose of getting rid of vibes, UCF lopro mount is an awesome choice.
 

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Discussion Starter #4
Glad you asked actually. I've been trying to track this issue down for a few weeks now. I have a 4" lift with a 1 1/2" TC drop right now. I added 3 washers to the TC drop and am still having the same vibs... I have checked the u-joints for horizontal play and there isn't any that's evident. This is my last ditch effort before actually disconnecting the drive shafts to check the U-joints for sure.... any other thoughts on things i'm not thinking of would be a world of help!
 

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Any TC issue that isn't solved by 1.5-2" of drop has another cause. That being said, I did a UCF lopro and MML on 4" SL and it completely eliminated the vibes without a SYE or TC drop.
 

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Discussion Starter #6
if you are looking at it for the purpose of getting rid of vibes, UCF lopro mount is an awesome choice.
So I checked out this product. I'm seeing it at over $100.00. I'd be willing to spend that much but is it worth to extra money when an OEM one is like $20.00? All I want is for the vibrations to go away. I'm not really worried about it holding up in the apocalypse or anything.
 

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Well it depends on what is causing the vibes. If it is loose bushings on the mount, yea, oem works great. If it is caused by driveshaft angles, the stock one won't be any better than the first. The UCF one is low profile, so actually lowers the transmission down onto the plate. For me it was a tad more than 3/4" (not the 1" they claim, but that was just my experience). So that would be equivalent to a 3/4" TC drop.

However a accelearation vibe is usually due to bad u joints.
 

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Discussion Starter #8
Any TC issue that isn't solved by 1.5-2" of drop has another cause. That being said, I did a UCF lopro and MML on 4" SL and it completely eliminated the vibes without a SYE or TC drop.
Really??? that's the first I've heard of anyone doing that setup.... what size MML did you use?
 

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Discussion Starter #9
I'm under the impression that bad u-joints will have horizontal play in them...I checked mine and there is none. Can they be bad and have no play? or would I have to actually take the drive shafts off to know that for sure?
 

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This is my last ditch effort before actually disconnecting the drive shafts to check the U-joints for sure.... any other thoughts on things i'm not thinking of would be a world of help!
I would disconnect the drive shafts right now before you spend money. For the front you just need to disconnect it at the axle side and then strap it up and out of the way (likely isn't this though though). The rear just disconnect at axle side, pop off the metal collar around the rubber boot around the t case output shaft and it'll slide right off. Either side is only four 8mm bolts.
 

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Just the normal 1" JKS mml.

any kind of u joint play is bad play. I also suggest checking the drivelines
 

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Discussion Starter #12
I would disconnect the drive shafts right now before you spend money. For the front you just need to disconnect it at the axle side and then strap it up and out of the way (likely isn't this though though). The rear just disconnect at axle side, pop off the metal collar around the rubber boot around the t case output shaft and it'll slide right off. Either side is only four 8mm bolts.
Good point....
 

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Good point....
That's what I would do that also, but even if the vibes go away without your rear shaft, your mount could still be the culprit. Steeper than stock drive line angles will cause a deteriorated mount to move more than stock dl angles. I would first pull the transmission mount nuts on the bottom of the skid, block up under the engine oil pan, then pull the transfer case skid and see what condition the mount is in before spending $'s on anything. If the mount looks good, put it back together and disconnect each drive shaft and go from there. If the mount is bad, just replace it with a stock one. You won't need to spend the extra on the lopro unless you want to try and ditch some of your tc drop.
 

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Really no reason to pull the skid though, unless your looking for practice. Comes out easy enough without.
 

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Discussion Starter #15
That's what I would do that also, but even if the vibes go away without your rear shaft, your mount could still be the culprit. Steeper than stock drive line angles will cause a deteriorated mount to move more than stock dl angles. I would first pull the transmission mount nuts on the bottom of the skid, block up under the engine oil pan, then pull the transfer case skid and see what condition the mount is in before spending $'s on anything. If the mount looks good, put it back together and disconnect each drive shaft and go from there. If the mount is bad, just replace it with a stock one. You won't need to spend the extra on the lopro unless you want to try and ditch some of your tc drop.
So I replaced the transmission mount and while I was under there I had a good look around....realized I had a complete set of adjustable control arms already installed....I bought this lift kit from a buddy and he never mentioned it to me so I guess I just never looked, I went to do the grease certs and was pleasantly surprised!
That being said, I was talking with a mechanic who told me that adding washers to a TC drop is a bad idea because the TC drop not only lowers the TC but it also shifts it forward...so lowering is straight down from there is putting things at an 'unnatural' angle. Any thoughts or feelings about this?
So the result of replacing the transmission mount: The definite "shutter" I was feeling at take off is repaired... but now I'm feeling a vibration through-out 1st and 2nd gear...I can really only feel it in my stick shifter and it doesn't seem to be vibrating elsewhere so I'm not sure if it's even an issue...
So here are my follow up questions for you very very helpful folks!
-Any thoughts on my new vibrations?
-Could the vibrations have something to do with the fact that I've never had my adjustable control arms aligned by a 4x4 shop?? I mean I get it aligned at GoodYear about every 6 months or so, especially if I've been wheeling. But I don't know if that applies to the control arms, I don't think it does...
-Mostly I'm worried about the new vibrations I feel in 1st and 2nd gear, it starts at like 1400 rpms and goes until around 2000 rpms and then goes away, and it's only when accelerating...The same mechanic that told me not to add washers on my TC drop also mentioned not to get too paranoid about vibrations unless they are resulting in death wobbles which mine are not. Maybe I'm just looking for some reassurance or something who knows lol. Any thoughts are appreciated!
 

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So I replaced the transmission mount and while I was under there I had a good look around....realized I had a complete set of adjustable control arms already installed....I bought this lift kit from a buddy and he never mentioned it to me so I guess I just never looked, I went to do the grease certs and was pleasantly surprised!
That being said, I was talking with a mechanic who told me that adding washers to a TC drop is a bad idea because the TC drop not only lowers the TC but it also shifts it forward...so lowering is straight down from there is putting things at an 'unnatural' angle. Any thoughts or feelings about this?
So the result of replacing the transmission mount: The definite "shutter" I was feeling at take off is repaired... but now I'm feeling a vibration through-out 1st and 2nd gear...I can really only feel it in my stick shifter and it doesn't seem to be vibrating elsewhere so I'm not sure if it's even an issue...
So here are my follow up questions for you very very helpful folks!
-Any thoughts on my new vibrations?
-Could the vibrations have something to do with the fact that I've never had my adjustable control arms aligned by a 4x4 shop?? I mean I get it aligned at GoodYear about every 6 months or so, especially if I've been wheeling. But I don't know if that applies to the control arms, I don't think it does...
-Mostly I'm worried about the new vibrations I feel in 1st and 2nd gear, it starts at like 1400 rpms and goes until around 2000 rpms and then goes away, and it's only when accelerating...The same mechanic that told me not to add washers on my TC drop also mentioned not to get too paranoid about vibrations unless they are resulting in death wobbles which mine are not. Maybe I'm just looking for some reassurance or something who knows lol. Any thoughts are appreciated!

Sounds first like you need to find a new mechanic. A few washers above the skid won't hurt anything, and anyone who tells you not to worry about vibrations unless they result in dw is way off base.

Take some pictures of your transfer case, drive shaft, and pinion angles as much straight on from the side as possible and post them up. Have you removed the washers from the skid? Also, do these vibrations go away as you increase speed, and where are you feeling them?
 

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Discussion Starter #17
Yes I took them out, are you thinking that may be the source of my new vibrations? I should throw them back on? Also, I was out the other day and saw a jeep with a very similar lift to mine that had these black almost rubber looking spacers between his skid plate and frame...have you seen this before? I was thinking that might be better than washers. I'll have the pics up right after work, I'll take pictures w/o the washers in first because the angle honestly doesn't look that bad to me.
 

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Do these vibrations go away as you increase speed, and where are you feeling them?

Normally, drive line vibes get worse as you increase speed. My guess is that there is something else going on. If you feel it in the steering wheel, it could very well be tire balance. I wouldn't put the washers back in yet. Post some pics.
 

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Your drive shaft is not a CV? Correct, in which case it should not be pointing at the TC output. It should be parallel with the TC output.
 
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