I have a 1993 K3500 4x4 and need to replace the front diff. It has 410 gears and has not been an easy find (in my area anyways, Calgary Alberta) and I don't want to buy a rebuild due to the costs. My question is, what years will fit in my truck, and does it need to come from a 1 ton or will a diff from a 3/4 ton fit? Any help will be great. Thanks