I just have a question for you guys regarding nv4500 transmission choices.
Seems like a lot of guys are running nv4500. I had a 2g 12v 6bt p-pump cummins with nv4500, the 3rd and 4th gear gap when going uphill is not pleasant on that truck, flat road is not too bad. Either 2300rpm on 3rd or 1500rpm no boost on 4th. I am not a fan of that gap between 3rd and 4th gear. It is a heavier vehicle than an 80 series, so it might be ok on 80 series? (please chime in with your experience) nv5600 or g56 have that gap filled in.
NV5600 parts are hard to find, I understand that can be a less popular choice, what about the g56 came with 3rd gen and 4th gen cummins? Is the trans tunnel the limiting factor here?