hey im gettin ready to put a 6 or 7 in lift on my 06 gmc sierra and i was wondering whats the biggest tire size i could fit i was want to put some 37x12.5 or bigger any suggestions

 

no way your gonna fit 37's on a 6-7" lift. depending on the wheel offset and true lift height you might have issues with 35's even. look at what your lift company recommends for tire sizes.

 

35s max bro... your going to have togo go a 6" + 3" body lift is you want 37s..
I don't recommend anything bigger than a 35 on 1/2 tons. the transmissions and rear diffs are really weak. not to mention your going to have to beef up your tie rods, idler, and pitman...

 

ya dude i got a six inch procomp lift with 35s and they rub when i turn

 

33's...

 

I have a 6 inch lift running 32 inch tires, and i had to trim a little on the front

 

all depends on the backspacing and offset

 

I've seen 37s with a 3" body lift and I've seen 33s on a 10" lift.. Its all about the wheels and they style you want.. Personly stuffing the biggest tires you can on the truck looks like crap

 

I agree with bumpers, all tire and no wheel well looks like crap

 

With a 1/2 ton...? 35's. or get an 8+ IMO. I've seen a few guys do a 6" with 37's on their 2500's, but they all have aftermarket bumpers or a good amount of trimming up front.