82 240d Project Issues

[Miklas]

Hi, wondered if anyone had answers as to why my front driveshaft from an 80 240d manual is about an inch and a half too short? I put in an engine from that 80 car plus a manual transmission from an 80 300d (so it says in chalk on the top anyway) into an 82 240d auto chassis. Everything fits--the engine, the rear drive shaft bolts into the chassis and the transmission bolts in fine as well, but the front drive shaft barely hangs off the rear drive shaft threads when it's bolted to the flex disc. It doesn't plug in all the way like it did on the '80, and I don't think it's drivable like that. Kinda stumped, do I have to have some specialist lengthen my front drive shaft or am I missing something obvious? Thanks!