i just obtained a 1985 k20 pickup with a 1 ton suspension under it and have some questions as to what the heck some of the stuff is. 1) the guy i picked it up off of said that it has a heavy duty tranny called a 700kr. then he went on to explain that it is a factory updated heavy duty t400. is there any truth in that? 2) he also said that is has a 13 inch rear with 5.13's. is that a variation of the 14b? have any idea if it is a Full floater? 3) what front end would factory accompany that rear? 4) it has full factory lockers in the front and rear. how strong are they? 5) he said that the truck has an LT9 350 block factory rated at 375 horse and 405 ft./lbs.... any truth in that cause i have never even heard of an LT9 block. 5) it has a np 203 t-case. but it is not full time AWD. how heavy duty are those t-cases? i just want to validate the claims of this guy and make sure every thing is worth taking the time to put under my blazer. thanks alot for all the help.