Originally Posted by 75gmck25
The best would be the gear driven NP205, but this would be uncommon even as a swap. They were only used on older trucks, and often only with a 4 speed manual.
Sorry, but that is not correct. The NP205 was used in the 1-ton trucks through the 1991 model year (in the old body style trucks). They were used with ALL transmissions, including the 4L80E in the 1991 model year only (now THAT'S a rare combination, since it was only used in the crewcabs and possibly 3/4 ton Suburbans).