From the specs at Novac's site it looks like the Dodge input
shaft is 1.125" longer than the SM420. That would be
a real problem. The GM NV4500 is only .125" longer.
Isn't that the same problem you have with the T5,
that is just a tad longer?
The case with the 5th gear extension is nearly twice as long as
the SM420. Wouldn't be a problem with a 3600 but might be with
a 3100. I don't have one to compare it to but you would need
about 20" from the bell housing to the output shaft.

Again, that is a sweet transmission, super smooth. Not to
popular with the off road guys because first isn't really a
rock climber gear like the SM420 or SM465.

It wouldn't be a surprise if there would be a few things that
would need some adaptation to install it. I can't find any info
on the front bearing retainer diameter, but I'd bet it would
take some machining or possibly even a custom one turned to
fit. It's really a heavy trans, looks to be a full 60# more than
the SM420.
dg

Last edited by Denny Graham; 08/01/2014 12:14 AM.
Denny G
Sandwich, IL