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Unread 12-10-2012, 07:46 PM   #1
ad-man
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Why is my Transmission mount like this??

So, My problem has been a rough rattle/ vibration at about 1800 RPM's Mostly in 3rd gear. (Automatic).
Can't figure out that the heck is going on. So I tossed it in to 4x4 just for the heck of it. and it got worse. Really worse, so I took it back to the house and up on the ramps and started looking. Then I noticed this. I have had problems with a stripped bolt on one side of the mount and know that it was resting on the cross-member before. Now for some reason its about 3/4" above the support.
How can it do that??
I looked at the motor mounts, but they seem fine, What on earth could make this ride this high off of the support? I figure that its riding high and hitting the body and causing the vibration of the cab. Maybe even causing the knock sensor to adjust the way the motor runs.
Any thoughts??

jeep-12.10.12-001.jpg  
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Unread 12-10-2012, 07:47 PM   #2
ad-man
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here is one from the other side
jeep-12.10.12-003.jpg  
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Unread 12-10-2012, 08:02 PM   #3
CJ7-Tim
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The transmission mount appears to have failed and needs replacement. New motor mounts would also be a good idea.
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Unread 12-10-2012, 09:11 PM   #4
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You should also find and fix the source of that tranny fluid leak.
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Unread 12-10-2012, 09:20 PM   #5
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Enough fluid has leaked out to make the tranny lighter, and it floated up!

Sorry... couldn't resist. Your mount is shot, as mentioned. Don't know how it "exploded" out like that, but it is holding everything up.
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Unread 12-10-2012, 09:52 PM   #6
BigByrd47119
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Yikes, at least they are fairly easy to replace. As said, check engine mounts at a minimum, replace to be on the safe side.
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Unread 12-11-2012, 12:00 AM   #7
Reptile
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Tranny mount is clearly shot. You can very well see it's cracked. You can find them at rockauto for WAY cheaper than the part store. I paid like 30 bucks for the tranny and 2 motor mounts.

The leak is coming from the gasket, looks like.
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Unread 12-11-2012, 11:33 AM   #8
ad-man
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Yes, i know it needs replaced. And yes my 24 yr old jeep is leaking.
Thanks.
The question is, Why is it sitting so far above the support bar?
It is my logic that the motor and the tranny are bolted together. They both are held in place by two motor mounts and one (this one) tranny mount. The the two drive lines. Agreed?
So what of those 5 points would make the tranny rise and ride 3/4" above this support?? I think that gravity would keep it down on the cross member. So either the side in the drive shaft is locked up somehow but will not correct its self or the motor mounts are so shot that the whole thing has jumped up on something and is also lot correcting its self. But if that were the case wouldn't the tranny still weight its self down to the cross member? When i had to put a bolt back into the tranny at this support a couple of months ago, it was sitting down on it.
Just can not figure out why it is riding like this.
I am so sick of working on this thing that it is parked for now.
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Unread 12-11-2012, 11:58 AM   #9
Reptile
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XJ trannys have residual anti gravity powers coming from the dark side of the force

I think you're asking yourself too many questions. You won't know how high it's supposed to be until you find yourself raising the transmission to make room for the new mount. I gained about an inch when I changed mine; didn't know it was that low.
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Unread 12-11-2012, 01:52 PM   #10
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The tranny and motor bolted together makes a "unit"... one big piece. The unit is held in place by two motor mounts and one tranny mount. Three points only. Remove those three points and the whole shebang hits the ground. Your rubber tranny mount appears to be making contact with the crossmember. How can it sit lower when it is resting on the crossmember? I don't know what a new mount looks like. I just got my first-ever Cherokee, but logic says it can't go any lower than where you are now.
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Unread 12-28-2012, 11:58 AM   #11
ad-man
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Well i finally got time last weekend and took the mount off. I took it to the parts store to make sure they gave me the right one. As it turns out, that is the way it is supposed to look. Guess i just thought it was flat before. So now i have at least removed that from the list of possible causes for this heep running as it ad as it is.
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Unread 12-28-2012, 01:45 PM   #12
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Quote:
Originally Posted by ad-man View Post
Well i finally got time last weekend and took the mount off. I took it to the parts store to make sure they gave me the right one. As it turns out, that is the way it is supposed to look. Guess i just thought it was flat before. So now i have at least removed that from the list of possible causes for this heep running as it ad as it is.
Any progress is good progress! Congrats on eliminating one concern.
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Unread 12-28-2012, 04:03 PM   #13
RLE
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I had a bad oil leak (rear seal in the transmission was bad) that I let go for awhile, just kept filling it. Then one day the trans mount rotted out and the tranny would hop around when in a high torque situation. The driveshaft u-joint would clack against the floor pan. I don't know for a fact that the oil rotted out the mount but it sure didn't do it any good.
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