doubt its the diff, but if you need one i have a 4.10 open you can rebuild.
if you want to do a stroker, i have an 87 eta block with crank, rods and pistons in it. i’ll sell it stupid cheap. $50.
if you want to do a good stroker, i have new in box 10.2:1 mahle pistons w/rings
those pistons take 325i rods. have a spare set of those with 60k on them
i have a head for that, 325i head w/ 65k, milled, cleaned, 3 angle valve job, new valve seals, valves reseated
what else? if you’re doing the stroker you’d want to go motronic. i have a spare harness. i have a 325i intake manifold, and throttle body, and exhaust manufolds.
headgasket set w/head bolts? got one of those. look at my for sale thread, i seriously have like 6 or 7k in e30 shit im selling