Originally Posted by
yorker
How do you like the 4.1 six? Those 4l+- Sixes are very popular in South Africa.
The series tranny is a bit stronger than it really gets credit for IMHO.
I guess you could swap out the Series tranny for a 4 speed GM tranny adaptred to the series box- that would be a nice way to go. SO far I've not seen a SM420 used but I have seen one SM465 mated to a series transfer case. Ike Goss also makes the NP435 to series T case Adapter and the NP435 could be used with a GM engine.
Depending what your differential ratio is you might not need a OD for road speeds if you ran 9.00 16s.