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RandyL
05-05-2004, 17:55
I have a'87 silverado 1/2 ton 6.2,just installed a banks sidewinder what a difference.Right now I'm running 30 9.50 15's and 3.08 gears averaging just over 20 mpg.i'm wondering if someone can tell me how big I can go without lifting the truck and what kind of mileage I can expect.thanks.
jcomp
05-05-2004, 18:45
I don't know about a truck at stock height, but my K5 has 3/4 ton springs in front and a 4" block in the rear and I'm running 37s and 4.10s. There was some seriously ugly fender trimming involved, but IMHO trucks are more useful if they ain't pretty :D . After I installed the banks system on it, I got 19 MPG driving through the mountains.
john8662
05-06-2004, 11:13
My truck is pretty much the same as yours, 86 1/2 geared 3.08. I have my turbo, but still have some parts to get in the system before I install it. I also have the same size tires you have. What do you think of the performance with those tires and the turbo. I was considering going to 3.42 gears, as I don't care for the 3.08 in town. I used to get 23mpg with the 235 75's that were on it, now at about 19. So i figured that gears and the turbo would help.
TonyL
05-06-2004, 13:36
The biggest tires I have personally seen on a 1/2 ton 4x4 were 32x11.5x15 and they fit the wheel well good and looked great too.

Tony
Dieselboy
05-06-2004, 14:42
285s are the popular size for the 16" rim crowd, and they translate to be just shy of 33". I don't think that there would be any trimming needed if you're 4wd. For us 15 incher guys, 32x10.50 is also nice. A true 33" tire will tend to rub on full steer.
84 Convert
05-08-2004, 20:26
I'm runnig 255/85 R16's on the GMC and they rub only slightly at the rear of the inner fender when the suspension is fully compressed. They measure nearly the same as a 285 if nothing else, a little taller. If you like meaty mud tires, the Super Swamper radial 33x10.50R15 might fit about the same. This size may appear a little too big on a std height truck. Running these tires with a 0.70 OD and 3.73's I'm at about 1800rpm @70mph. No idea about mileage due to having not gone back to the 6.2 yet.

Gregg