I have open 10 bolts on my 88 k5 and wan't to put either lockers or 4.56's front and rear. Im gonna leave the motor because factory says the 10 bolts have trouble with the stock gearing and 35's... the motor will be makin somewhere around 375 hp at the flywheel.... Do i need a 12 b or 14? I want to put gears in it first until i can get some money but i might weld up the front and throw a lockright in the back while im at it. Will a 10 bolt hold up? If not with lockers will it live with the gearing and open diffs? If im gonna bust something i'm gonna wait until i can get some good 1 tons. Oh yeah... how do i tell if i got d44's or d60's? What about the gears... i no the stock gears are on the tags but i think the last owner did some work to it. It has chrome covers so i can't help thinking they might have swapped the old gears out when they did the lift. Seemed like it had real good response when i had the stock 350.