Hey, I am going to Buy a 1985 Silverado 3/4 Ton 4wd, That is BONE Stock, no Rust, Has Original Dual Exhaust. Even the Mufflers are Stock. (But they Need Attention) Any way. I want to Get some Better Gears in the rear, It Has 4.10 or 4.11 in it now. I want something Like a 3.42 or 3.08, somewhere in that Region, 3.73's are Over Rated in my books. Then I've been looking at the 5.3L Ls Engines, I've been thinking about Getting one with a Transmission with all the Wiring and ECM. I dont know For sure what rear End it has in it. I know its a 3/4 Ton rear. I tried looking around but I havent seen any Ls Engines in the 73-87 Chevy Trucks. and Cant Find any Gears other than 4.10 and 3.73's for the 14bolt Rears. I Dont know what this one has.. I didnt Count when i Looked at it.