Just installed a 6 in lift with 2.75 coil overs on my 04 F150 Crew Cab 4X4, everything seems to be tight and everything went together soundly, or so it seemed. Although now, after an alignment and rotation and re balancing of tires, the front end shakes pretty violently after 45 MPH, i have no idea what it is, no shakes whatsoever until 40 or 45. i hope someone can shed some light on the subject. . . a wheel bearing or something. . im clueless

 

Do you have a steering stabilizer?

 

If it just started after thr rotation and ballance most likely you have a tire that is not ballanced properly also a possibility that you have a faulty tire,
Lug nuts are tight?
A stearing stabilizer is a must have for a smother ride .

 

it vibed before the roto - rebal, and the steering wheel doesnt really move that much when it vibrates., is a steering stabilizer a common necessity with a 6 in. lift??

 

steering stabalizers are no way a necessity. honestly, it really sounds like you have a tire that wasnt balanced properly. have them re-balance them.

 

did you have your wheels and tires road force balanced. Mine shake between 55-65. I need to take mine to get road forced balanced. My 33's wobbled pretty bad before the raod force balance, after road force, they were good to go.

 

i honestly dont think it is the tires, not this, it is exactly the same as it was before the rebalance, and i dont feel a vibe on the steering wheel. after looking at it and thinking about it, i havent lifted the rear yet, so i think it i the driveshaft angle or something of the sort, a friend has a lifted duramax and said it did the same exact thing but worse when lifted and the driveshaft was the cause some way or another, and to the guy with the silver on a 6 in. and 36's, **** i hope mine looks that good. no problems with rubbing?? or turning??

off the subject, is a 325 aspect ratio tire a 36??