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Guy at this link did a NV4500 swap on a 1993 Chevy 2500 4WD behind a 6.5TD setup that was originally an automatic; has some info & parts numbers that might be helpful...
DIY: GMC NV4500 Conversion project - Diesel Place : Chevrolet and GMC Diesel Truck Forums
'Tanner'
DD - could be 'Daily Driver'
MT - could be 'Manual Transmission'
GR - Gear Reduction Starter
BB - Big Block - most often referring to Chevrolet motor
SB - Small Block - most often referring to Chevrolet motor
I *believe* that the physical case size between new & old are the same - the internals...