Diesel conversion
Hello All, Don here and I have a question or two. Does anyone drive a 20K in weight, and 19.5 wheels, diesel power and a 4 speed automatic with no OD. I am trying to figure a ring and pinion chang...
Forum Discussion
ScottG wrote:
I've never seen a 4 speed auto that wasn't an OD. Sounds like you need to change the gearing to a more conventional 3.73 or 4.1.
The older heavy and medium duty Allison's (HT 740 and MT 654) were not overdrive.
I have the MT 654. It is a five speed. The torque converter locks about half-way through second and stays locked in third, fourth, and fifth. Nothing like your average car trans.
