Vibration problem after 2" lift - looking for ideas
This is in regards to my '01 XJ, 140,000 miles.
I installed a 2 inch lift last week. New springs, new shocks, along
with new ball joints, tie rod ends, drag link, sway bar disconnects
and track bar. Following the lift, I had the Cherokee aligned.
I now have a vibration. It starts at about 40 mph, is more noticeable
at 50mph, and is obvious at 60mph. Up to 75, the faster I go, the
worse the vibration. It does not diminish when I let off the gas.
The vibration is noticeable in my butt, through the soles of my feet,
and through the steering wheel.
ARB, and the company that sold me the lift, both said it sounded like
driveline vibration. Last night I installed a one inch transfer case
drop kit. The vibrations did not change.
My last idea was that a tire may be out of balance; perhaps I knocked
a weight off when I installed the lift. Also, some of the components
I replaced, especially the ball joints, were very worn. Perhaps the
vibrations were always present, and are now more noticeable.
Driving in 4-high either does not change the vibration, or reduces it
So I took it to a good front end shop today, and they test drove it.
They too thought it felt like it might be a tire. But three of the
four tire were exactly in balance, and the fourth tire was only 0.75
ounce off. Rebalancing that tire did not improve things.
There is no sign of tread separation. Before today, I last had the
tires balanced six months ago, and they were road force balanced at
The mechanic today also put it on the alignment rig, and confirmed all
measurements are in specification. He checked all universal joints,
and said they all seemed good.
He did notice that there is a fair amount of lateral play in the rear
bearing on the transfer case. His one idea is that there is enough
play that the driveshaft may be moving around and causing the
vibration. He isn't enthusiastic about this diagnosis, but it was his
So, where to from here? Ideas, comments?