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post #1 of (permalink) Old 06-11-2007, 02:27 PM Thread Starter
 
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94 yj Rear/Tranny/Transfercase Problem?

Have a 93 rusty bucket as my spare jeep. Torque converter is on its way out but that's not my worry here. It's an auto with 4.0 and getting some real bad vibration in what seem to be the rear. Usually when under a load and slight turn. When i throw the truck into reverse it seems to look up like the brakes are on or a piece of metal is lock and stoping the truck like a broken gear? Opened the diff covers and everything seems to be good my tranny guys said a little play in the spiders but he has seen worse. Took the transfercase/tranny drian plug and fished with a magnetic wand and found no piece or shavings. Could it be an axle issue maybe bent. I dont drive this jeep much but getting to ready to fix and get rid of her as my 383 is ready for my 95. Any clues would be great. Thanks.
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post #2 of (permalink) Old 06-11-2007, 03:40 PM
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Sounds like a driveshaft U-joint, except that it''s effected by steering. That points to a front axel U-joint.

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post #3 of (permalink) Old 06-11-2007, 03:59 PM
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Quote:
...That points to a front axel U-joint..
... unless there's a motor mount, a transmission or transfer case mount broken, letting the driveline shift under load when turning. Also, I'd check out the rear spring packs and rear brakes.
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post #4 of (permalink) Old 06-11-2007, 04:07 PM
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Good points

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post #5 of (permalink) Old 06-11-2007, 08:03 PM
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Check the yoke on the rear axle pinion. It should have zero motion in/out, side to side or up/down. It should only rotate. If your crush sleave has way over crushed or come apart this can a low the pinion flop around in when going forward leading to vibration. In reverse or engine braking while going forward, the pinion will be pulled into the differential carrier. It will also lead to lots of backlash in the rear end which may be falsely blamed on the spider gears.

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