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No, the VIN only designates whether it was a "C" or "J" code engine, and all CUCV's had J code 6.2's (non emissions) and of course the year the truk was built.

If it was a J code, it would have a non EGR intake and should not have the EPR (Exhaust Pressure Regulator) flappers on the manifolds. The head gaskets can be stock with a turbo, but a lot of people use 6.5TD gasket to slighty lower CR. Replacing the head bolts are MUST. The factory bolts are...

My mistake. "D 15 4" would be April, 15th 1984! Sorry about that!aua D 15 5 would definitely be April, 15th 1985!

There is a casting number on left rear side of the block where the transmission mounts. There is also a date code that will be something like "D 15 4" or "G 20 6". The first letter is the date : A = January, B = February, and so forth. The first number (or pair of numbers), and the last number...