Shimmy above 70 MPH

[drmiles]

Stacy known problem with lifts and front driveshafts. Fab Tech includes a new drive shaft. Wheel balance and tire balance can also cause vibration. You can remove the front shaft and drive it to see if vibration goes away(drive in 4 hi lock). If not front shaft has to be tires. If you have more than 2 ounces on a tire have them rotate the tire 180 degrees on the rim.

Pulling while breaking = breaks on one side grapping harder than the other. Mud in calipers, stuck caliper piston (can't think of the right word) or pads worn or fluid on pad. Have the dealer check the breaks and calipers.

[nmu98]

Originally Posted by drmiles

Pulling while breaking = breaks on one side grapping harder than the other. Mud in calipers, stuck caliper piston (can't think of the right word) or pads worn or fluid on pad. Have the dealer check the breaks and calipers.

Dont get worried, it can also be an alignment issue....

[mikejr]

sounds to me like it has to do with the driveshaft or half shafts since the angles on them has changed due to the lift.

I recall after lifting my GMC Jimmy many moons ago I got a very bad vibration, turns out the U-Joint was failing and soon broke ruining the rear drive shaft.

[drmiles]

Half shavt angles don't change that much. the cv joint is able to handle the increase angle. The drive shaft however is not. ON my 03 we had to have a new shaft from Woody shfts made with double ujoints on the tranny side to stop the vibration. The Vibration was always present, just worse at higher speeds. Vibration in the front seats at highway speeds = rear tires. Vibration in the steering wheel at highway speeds = front tires.