I finished my 4.5" lift and got some 32" BFG A/T's from a guy in my club. I have a few issues when the 31" tires were on no problems put 32's on and now at 45-55 mph I get DW. The guy had told me he got slight vibration at 45to 55 but this is nuts. Could it be that they are not balanced and have not done an aliagnment yet. Would any of this fix it?

Next my MPG went up havent figured out how much yet. Usually at half a tank I was at 150 miles yesterday at half it was 190 miles. Is this normal?

Thank you

 

I would say yes they need to be balanced and alignment needed.

 

See if someone around you does on vehicle balancing. They spin the tire up to 70 MPH on your car and watch for the out of balance condition. They install the counter weights and then they re-spin to see if they cured it. Much better balancing and takes into account an out of balance rotor or wheel.

 

I will try that BLUE. I am going to get aliagned tomorrow morning we will see what happens.

 

The diferent of the MPG is about 20% and it hasn't realy change because the 32' tires make bigger cyrcle. You have to calibrate your tachometer. My XJ with 32" has 12% diferent (when it is 100 the real klms are 112)

 

I noticed my MPH were about 5 off of my GPS so that will be next.

 

One of the things that happens with a lift is that the camber angle is reduced. If it is maintained at six degrees, you won't have the wobble even with loose parts.

The way the geometry is with the upper and lower links, when the axle drops, the camper angle is reduced, if the stock length arms are used. When your at the aligment shop, have them check the camper angle.

 

Next my MPG went up havent figured out how much yet. Usually at half a tank I was at 150 miles yesterday at half it was 190 miles. Is this normal?

Do you drive a lot of highway miles because i get to 190 on a whole tank but i do a lot of city but still...

 

The first thing you have to do is get a front end alignment. The "Y" shaped tie rod tows in the front tires as the axle drops (lifted). The alignment will probably take care of it.