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Re: OT - Help Identifying rear end on 78 GMC truck
From what I understand, GM used 4 different rear ends (10,12,14 semi,14 full) and three front ends (10, D44, D60) in those years. So, unless your truck has had an axle swap it's a 10 bolt. Also, a NP-208 t-case was rare (if indeed original) to anything but the '82-'87 model years. If the case is aluminum, it's a 208 or a 241. The 241s were found in '88 and up trucks, so it's a 208 unless it's been swapped out.
If you could take some pics of the rear end we could confirm it. In the mean time, this is a 44:
and this is a 10 bolt:
Ah - the images don't work. Copy and paste their address into your browser and you should be able to see them.