I have a 2005 F150 STX, and just put new 17X9 Rims and 33X12.5 R 17 **** Cepex Radial fcII tires on it. Just drove it today for the first time and the steering wheel wobbles pretty good at 50 mph. It stops at 55mph but starts again at 65 mph. It's not quite a death wobble but it does wobble pretty good. My question is do I need a steering stabilizer? I didn't think the 33's were too much above stock but obviously they are. Any help appreciated.

 

More than likely it's a balancing issue. It is definately not the size of your tires causing the vibration.

 

yeah it is definitely a balance issue

 

Well, that's what it was. Tires not balanced. Brought them to my local mechanic he balanced them and it is much better now. It still wobbles just a tiny bit at 60 mph now. I brought it up to 70 mph and it was perfect. Thanks to
TXDREW and Wandell for the advice.