34's on my '98 Busurban K1500.

[jjester6000]

what rear end do you have? I have a set of stock 3.73s from a 9.5SF in the shed. You can have them if you pay shipping

I got a 12 bolt, but I think I'm going to keep the 31's since this truck is my daily driver.

 

[boy&hisdogs]

Yea, I do got 3.42's, I'm probably going to stick with 31's.

I had 3.42 in my truck up until just recently. When I went from stock to a 33" tire I lost power (struggled and hunted for gears on hills) and went from about 15mpg to 12. It's ok if you live somewhere flat but would suck if you tow or offroad at all.