I have a 06 silverado. single cab, it has a leveling kit on top of a 6 inch suspension on top of a 3 inch body lift. so around 11 inches all together. im currently running 35's . i know to small for the amound of lift. but im going to be putting some 37's on when i get back from deployment. i still have my stock 3:42 gears in there from when i bought it. its not to bad on driving around anymore but i wanna get a lil bit of that power back like it was when i left the lot 3 years ago. i am having my family put it in the shop for me so its ready when i get back. i was thinking about running 4:56's but the guy at the shop is recomending 4:88's. everything i ever read suggest 4:56's. my truck is a 4.8 with an automatic tranny. the tire and wheel combo im looking at are some black pro-comp alloys with 37 inch X- terrains. any help would be greatly appreciated.