Stupidly, I sold my 1978 Ramcharger in 2014 after 15 years of owner ship. It went from daily driver to trailer queen. Among other things, I put a 4 speed Atlas in it behind the NP435. First gear was 6.69 plus double low of 10.34 plus 5.13 axles came out to 358:1. That was basically useless but second gear in the trans made it 177:1. I normally ran it in single low at 3.8:1 in the transfer case. I wish I hadn’t sold that beast that I named Detroit Steel.From a conversation about my abysmal crawl ratio today -
Current build:
Torque converter ratio x 1st gear x TC low range x axle ratio
1.8 x 4.56 x 2.488 x 4.56 = 93.12
In 8th gear:
1.8 x 0.65 x 2.488 x 4.56 = 13.27 (which is probably why I can do 30 MPH in low range and where the convo came from)
Compared that to the new rig:
Torque converter ratio x 1st gear x TC low range x doubler x axle ratio
1.8 x 2.804 x 3.12 x 2.7 x 5.29 = 224.91
I may have to learn to drive differently.![]()