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Old 10-08-2010, 06:41 AM   #1
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Wobbley transmission?

I have what feels like a wobbly transmission or tcase. I have the MORE 1" torsion rubber motor mounts, and the stock skid on my 97TJ. The lift has about 8 years on it, an for about the last 4 I have noticed that sometimes when i hit a bump it wiggled, like rotated back and forth for a second. It feels just like the very first shakes of death wobble. I can feel it's below the seat, and not in the wheel, so it's not death wobble.

I am guessing that since the front of the transmission is lifted up off the front of the pan, it's probably not as well supported? Im guessing that I so need to replace the transmission mount? I know there are lots of you running the taller mounts on the stock skid- anyone else have the issue?

It's hard to tell if it's the tcase or tranny, they are both too heavy and secure to wiggle around by hand when I crawl under there. I've tried to see which lever moves when it happens, but haven't been able to since i cant reproduce it on demand. It's time to fix it though, since last week it actually resonated just right and progressed just like death wobble til I slowed way down! I haven't felt death wobble in years, since I replaced the suspension, and that little episode was enough to remind me how much it sucked!
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Old 10-08-2010, 10:54 AM   #2
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Someone fart in here or something?

No ideas?

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Old 10-08-2010, 11:52 AM   #3
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Most likely your transmission mount is bad. After supporting the transmission, remove the skid plate and you will know if it is bad or not. It's not an expensive part and should take you about 45 mins for the whole job.
98 TJ with 5.3 and 4L60E - CA legal swap, HPD30/D44, 4.56, Detroit Locker in rear axle, 4 inch SL, 1.25BL, 35x12.50x15, Cager Softs 15x8
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Old 10-08-2010, 12:17 PM   #4
Knows a couple things...

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X2. Don't forget to remove the four small nuts in the center of the t-case skidplate first, before unbolting the skidplate from the frame. Those nuts hold the transmission mount to the skidplate and the transmission mount cannot support the weight of the skidplate.
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Old 10-08-2010, 11:44 PM   #5
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Thanks, guys. The transmission mount has just moved up on my list of priorities.

Are the taller motor mounts putting extra stresses on it - It looks like the transmission and tcase are almost hanging in the air, rather than resting on the mount. Is there any way to alleviate the problem without going to a belly-up skid?
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Old 10-09-2010, 01:10 AM   #6
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Any advice on the replacement? OEM style? Urethane? I am seeing prices from $25 for OEM style up to almost $100 for urethane.

Anyone have experience with the urethane mounts? Im wondering if they transmit more motor vibration through the body? I have the Daystar urethane body mounts, and the MORE Torsional rubber motor mounts, so I am already feeling some of the engine - just wondering if I would be feeling more.

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