Help!
I installed a 4 inch Pro Comp lift kit on my 2016 Unlimited Sahara which included Shocks and Springs. I left the stock tires on it after the lift was installed and drove it for a few days. The Jeep was driving perfect! No vibrations at all and it was a smooth ride. I had 35 X12.50 x 18 tires mounted and balanced on the stock 18 inch wheels and an Alignment was done. After that the Jeep would Vibrate at the steering wheel when I got it up to around 55 MPH and get worse the faster I would go. Anyone have issues like this?

 

Speed related vibrations with new tires. No vibrations with old tires. Seems like that might be the place to start...

Get them rebalanced. Just because it was done, does not mean it was done right. I buy through Discount Tire which offers the free lifetime balance/rotation, so I go in at least every 6 months. I have left the shop with vibrations and had to go back a second (or even a third) time to get them rebalanced on several occasions. People make mistakes.

 

New tires may be the culprit but I wonder if part of the vibration is the tread of the tires?

 

It could be the actual tires as suggested. It could also be related to the additional weight of larger new tires, so may need to look at things like front Track Bar and/or ball joints.

 

Front drive shaft is also a possibility... if it was worn.... the added angle could create a vibration. easy thing ot do is remove it... drive it... if vibration is gone... you need to have the driveshaft replaced or repaired.... A 10 min job with instant results!