NP435 Trans Swap Help

if that granny-gear is useless, then it might be just as well to get rid of it. However, for you, the bigger issue, I feel, is that 3000@80 mph. Which points to the rear gear actually being a lil much....................... which would make it prime for a Mopar .69 overdrive which would bring it down
to 2100ish@ 80.
I don't even use 1st, start in 2nd.
It is a ridiculous crawl gear, same as reverse.

3k @ 80 was a fluke in my mind, I don't need to do 80mph in this thing.

If a Mopar .69 OD is the same as the auto OD available that same year-ish, and is a direct bolt in, I'm game.
Kiss principle saves $.