Did gm put out a factory posi rearend in 90 or 91 or was it an option? it turns out that i have one and i just wanted to know how common these were? if the rear is posi then would the front on the 4x4 be posi also?
i dont think they offer front posi, to easy to dig your self 4 holes and sit on the frame. check your parts identity tag in the glove box. G80 is the rpo # for posi. if that number isnt there and your sure you've got posi, then its ethier stanard eqyuipment or someone added it