I just got Jeep new to Jeep world. 97 Jeep tj. With lift. And I got bad shake when taking off whitch I fig I change tranny mount but driveshaft is running to left not straight. Is this normal ? And is transfer case look right? Idk nothing bout jeeps.
Tranny lift question help
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any idea of how much lift is present?
looks as if they lifted it, with no regard for the steeper pinion angle.
since it appears they kept the OE drive shaft, usually either the motor mounts are raised or the trans skid is lowered to restore as much of that angle as possible this should help with vibrations. the offset is most likely caused by not having an adjustable rear track bar the lift is gonna use the short bar to pull the axle to the pass side.
post pics of the rear track bar and it's mount.
and make plans to either do a motor mount lift or try and bust the belly pan bolts loose and stack a few washers in between the skid and the frame rail.
looks as if they lifted it, with no regard for the steeper pinion angle.
since it appears they kept the OE drive shaft, usually either the motor mounts are raised or the trans skid is lowered to restore as much of that angle as possible this should help with vibrations. the offset is most likely caused by not having an adjustable rear track bar the lift is gonna use the short bar to pull the axle to the pass side.
post pics of the rear track bar and it's mount.
and make plans to either do a motor mount lift or try and bust the belly pan bolts loose and stack a few washers in between the skid and the frame rail.
You can tell if the lift caused a shift by looking at the tires in reference to the body. IF one tire sticks out further from the wheel well and the other is in to the wheel well; then the body has shifted. This can be fixed by either redrilling the hole in the trac bar mount on the axle end (not desired choice) OR purchasing an adjustable trac bar and adjust the bar to recenter the body to the differential.
The driveshaft to the left can be caused by a broken transmission mount which would also cause the shaking (transmission and engine torque over) when starting to drive the Jeep.
The driveshaft to the left can be caused by a broken transmission mount which would also cause the shaking (transmission and engine torque over) when starting to drive the Jeep.
What is laying on the driveshaft? Having a vibe or shake at take off is often related to bad engine or trans mount. Replace all 3 with rubber. Add lift to engine mount at the same time if you like. Also pull the drive shafts and inspect for Ujoint slop. This can also cause vibe at take off as load is initially applied.
There's your problem. a 4" lift without having done anything to correct the now excessive angles at the front and rear of your driveshaft that is causing the u-joints on your driveshaft to vibrate... which is what you're feeling when you drive and especially when you accelerate.
4" of suspension lift, if that's what you have, is the magic number that when reached is the time to replace the rear driveshaft with a different type (called a double-cardan/aka CV (constant velocity) of driveshaft together with installing a SYE (slip yoke eliminator) into your transfer case to allow the replacement driveshaft to be used.
To keep the 4" of lift, I strongly recommend you get a SYE kit installed together with the double-cardan style driveshaft. And because a DC driveshaft requires a different pinion angle coming out of the rear axle, you need adjustable length control arm in the rear so the pinion angle can be adjusted to work with the DC driveshaft.
www.4xshaft.com can fixe you up with the right SYE kit and DC driveshaft.
If that's too much $$$ you can replace the 4" springs with shorter 2" or 3" springs but even that much lift can cause vibrations though on a milder/more easily corrected basis.
You can measure how much lift. The rear factory spring stock height is 8" and the front factory springs are 12" tall. Anything over that is from the suspension lift height. Like if your rear springs measured from top to bottom are 12" and fronts are 16" that means a 4" suspension lift.
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