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post #1 of (permalink) Old 04-16-2007, 07:23 PM
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I have a 1997 jeep TJ, i have a 4 inch suspension and a 3 inch body lift, with a 1 inch transmission case drop. its an automatic transmission, when i put my truck into reverse it vibrates heavily but when in all other gears it runs smooth.
Does anyone know what the problem could be? thanks
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post #2 of (permalink) Old 04-16-2007, 07:48 PM
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More info please -
When you first put it in reverse without moving, or when you let it move in reverse? Or both?

2 different problems.
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post #3 of (permalink) Old 04-16-2007, 08:16 PM
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Hey its both. i put it in reverse and it vibrates alot and even when im moving in reverse, but as soon as i put it in drive its fine the vibrating stops.
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post #4 of (permalink) Old 04-16-2007, 08:43 PM
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I know with mine I could not get rid of the vibes until I added a 1" motor lift. Solved everything. I pulled my 1 inch trans drop and that helped even more. Yours may be something diffrent. With mine it was just the angles.

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post #5 of (permalink) Old 04-17-2007, 09:45 AM
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Driveline Vibration.

I would be willing to bet that you also get 'some' vibration in forward under certain conditions.....

If you want to fix it right....dump the xfer case drop (never could understand why people raise the jeep and lower the xfer case) a CV driveshaft...shim the rear axle so that it's pointing at the xfer case and be done with will be the best $ you ever spent...

And get rid of the body lift...besides being unsafe (1" is ok), it rates high up there on the dork factor...

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84 CJ7, SOA, 5.7LTBI, 4L60E, 35"x12.5, 4.10 gears, F/Det, R/ARB, Full Roll Cage,
D44 Flat top in progress...
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post #6 of (permalink) Old 04-17-2007, 10:12 AM
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""""i put it in reverse and it vibrates alot and even when im moving in reverse, but as soon as i put it in drive its fine the vibrating stops.""""

OK - I think what you are saying is it vibrates/shakes when you are NOT moving, brakes still on etc. And it continues after you let it move in reverse.
I'll assume that's correct. And I'll have to assume your trans fluid is filled properly.

First off - a wrong driveline angle will NOT cause any vibration unless it's moving - the vibration comes from the U-joints binding or causing uneven rotation - but if they aren't turning (when you are stopped,) they don't do anything! They have to turn to cause trouble.

But - putting it in Reverse causes the engine to torque up a little, and in Reverse it has more leverage than in drive - due to the lower gear ratio in reverse, plus it's torquing in the opposite direction than in Drive.

I'd suspect you have a broken engine mount or trans/t-case mount, allowing it to "torque over" a little too much.
Or - the exhaust system is too close to the frame, hitting the frame or something when the engine torques over.

A broken mount or even the exhaust hitting may not be easily seen, unless you watch it while someone else (that you trust!) torques it over.

You might be able to tell if the mount is broken by putting a jack under the engine and/or trans and lifting the drivetrain a little - sometimes yes, sometimes no.
Try to determine whether is more of a noise than a mechanical vibration - sometimes it's hard to tell.

It's also possible it's an internal trans problem - low pressures causing shudder. Try holding the brake and raising the idle slightly - if the vibration stops it could be internal problems - have a reputable transmission shop take a look.

But first check the mounts!
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post #7 of (permalink) Old 04-17-2007, 01:18 PM
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Good Call Rich, betcha you're right!

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post #8 of (permalink) Old 04-17-2007, 11:00 PM
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I think Rich has it too with the engine torquing the opposite way.

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