Biggest tires you can run stock are used 34"s (33.7"). If you want to run full tread new tires stock, you will be limited to 33"s. So lets do the math:

Stock No Lift: 34" Tires (Used)
+ 3" Body Lift: 37" Tires (Used)
+ 2" Suspension Lift: 39" Tires (Used)

Stock No Lift: 33" Tires (New)
+ 3" Body Lift: 36" Tires (New)
+ 2" Suspension Lift: 38" Tires (New)

Lets consider gearing next. Moving up to 4.88s from 4.62s will just about account for 2" of tire size.

34"s w/ 4.88s = 32"s w/ 4.62s
36"s w/ 4.88s = 34"s w/ 4.62s
38"s w/ 4.88s = 36"s w/ 4.62s

You are really pushing the limits of the vehicle, but more power to you in my opinion. You will be setting the bar for what the stock trucks can handle. Right now the largest that has been run is 35"s with the IFS/Stock Setup. Between you running the 38.5"s and me running the Q78s (36") we will cover the upper end of what the stock trucks can handle. <img src="/forums/images/graemlins/kewl.gif" alt="" />

88 Raider(Red):160k-Reman'd 2.6-5spd-Weber-SW Hubs-34x9.5 TSL-OffRd Pkg-1"Tbar-2"BL-CB
88 Raider(Silver):No 2.6/Bad KM145 Parts/Project
88 Montero(Brown):No 2.6,4.88s Parts/Project

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