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Old 05-14-2011, 01:27 PM   #1
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Talking YJ Vibrates Under Load

Hi Guys & Gals!
I have a 4.0L 1993 YJ, and have had a problem with vibration while accelerating. I have a theory but want to see what others think or if anyone else has had the same problems. Ive had both the UJs replaced on the Rear prop which made it better but didnt completly stop the problem. I have made and observation that this seems to be more severe when i have passengers in the car but barely noticable if im on my own. Its very bad if theres an adult sat in the back! I have also noticed that my rear leaf springs look pretty shot and are "Flat" when parked up, and pretty much bending the other way when under acceleration or carrying passengers. Could these springs being knackered be putting excess strain on the rear prop and associated UJs by allowing the rear diff and axle to travel "Too High" under load or while carrying weight in the back?? im getting to the end of my teather with this one as its been a bit baffling and the Jeeps turned out to be a little bit of a money pit in the few months ive owned it.

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Old 05-14-2011, 02:09 PM   #2
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Location: Las Cruces, NM
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With the bad springs and a load, the change in the driveshaft angle is most likely causing your problem.....time for new springs!!

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Old 05-14-2011, 09:56 PM   #3
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Check your transmission mount.
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Old 05-15-2011, 03:34 AM   #4
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Quote:
Originally Posted by weirdodaddy View Post
Check your transmission mount.
Is this the mount that supports the transfer case against the stoneguard? Theres one thats a bolt that has 2 dounut like rubber mount either end that bolts through the stoneguard. I have to say thats not looking the best!
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Old 05-15-2011, 10:03 AM   #5
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Quote:
Originally Posted by YJ Pluto View Post
Is this the mount that supports the transfer case against the stoneguard? Theres one thats a bolt that has 2 dounut like rubber mount either end that bolts through the stoneguard. I have to say thats not looking the best!
Yes, the transmission mounts to the skid plate. There are two large bolts that go into the trans mount. That little bolt next to it is some sort of outrigger thing. I honestly have no idea what it does.

The skid plate has to come off. You have to support the transmission with a jack stand and pull the skid plate off. The trans mount is bolted to the transmission and also through the skid plate. It's not a real hard job unless the skid plate bolts are rusted. Then it could take a bit.

I had the same issues as you... vibrations under load. I also had a really bad grinding when turning right while accelerating. Checked my trans mount and it was broken in two pieces. It wasn't doing anything. New mount fixed those things.

Doug
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Old 05-15-2011, 10:18 AM   #6
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Thanks guys
This info gives me the right areas to begin with. I have to say Doug, imine makes some very obscure grinding/low down clunking noises when turning on hard left or right lock?? It seems to be fine to start with, and gradually starts making these noises when it warms up. Ive had the Diff checked and had the oil changed in both diff and transfer case which made very little difference. i think its more to do with the end float on the rear wheels and have just got used to hearing it alongside all the other knocks creaks and rattles i have

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