I own an 81 chevy C10 with the inline 6 cyl engine. I was going to put a 350cid. engine it it from a scrapped 85 GMC High Sierra 3/4 ton truck. A friend of mine told me the THM350 in my truck was not the same as the ones used for the 8 cyl. engined trucks that year. I don't particularly feel like wrecking a perfectly usable trans. because it wasn't built the same. Does anyone know anything about this?