Oh really? Why wouldn't putting standard 32s work on the stock rims? And thanks for the info I think I do want to put a body lift onto my truck now.
Edit: stock rims/wheels
Also I should say that I have 15" wheels, I'm guessing that's pretty common though. I was hoping to get these tires
once I put the new shackles and TB lift.
You are the lucky recipient of 2 answers.
This is mostly my opinion but 32x11.50 is WAY too wide for a 7" wheel (if you drive a Z71).
A Z85 truck has 6.5" wheels.
Look at the manufacturer site to learn nobody that sells a 32x11.50-15 will suggest installing it on a 6.5" or 7" wide tire. I don't think a shop will warranty tire wear on a tire mounted on on unapproved wheel width.
Will it mount. Yes...will you see premature tire wear? Most likely. The sidewalls are pulled in more and makes the edges of the tire not make contact with the surface, but the center has excess pressure at the contact point. If you under inflate the tire to try getting full surface contact you will end up cupping the center of the tire contact area.
If you have a Z85, 32x11.5 may not fit anyway. If you have a 2wd base model they definitely won't fit. All Z71's have the same height.
Sorry for all the info but you haven't given me anything to go on. You made a blanket comment on a truck with several suspension options.
1) 2wd base
2) 2wd Z71
3) 4x4 Z85
4) 4x4 Z71 (same as 2wd Z71)
You said you have torsion bars (assuming you know for sure) that rules out options 1 & 5.
GM changed wheels to 16" also, 2009 I believe. So 15" isn't necessarily common anyway.