I just installed 17x9 rims on my 35" pro comps. Prior to the install the truck drove great up to 75-80 now at 40 i get the death wobble i had the tires balanced is this due to the alignment because the rims are wider? what can i do to fix this problem. I have no lift just torsion bars cranked.

 

sounds like a balance problem, sometime shops struggle to get a good balance on big tires.
what wheels did you get?

 

these bad boys i bet everyone hates them but i love them American Racing crappy cell phone pic

 

Make sure everythings tight under the front end. Any slop anywhere or being loose can cause death wobble.

Its not from your tires being out of balance.

This is the whole reason i'm going with coilovers and redoing everything on my big truck. It got parked 6 years ago because it was so bad. (death wobble)