Quote Originally Posted by GMPX View Post
Nick, one of the Dodge experts might correct me on this, but the 4-speed 48RE doesn't have much in the way of electronic control, from what I can see on the wiring diagrams you only have, Pressure solenoid, 3-4 Solenoid & TCC, nothing like the Allison (or GM's 4 speed transmissions). Those 48RE solenoids are controlled from the ECM
The 6.7L went to a more complex full separate ECM & TCM system with the 6-speed 68RFE.
I know the DODGE 4 speed trans is actually a fairly wierd control pattern as it uses an electrocic governor control to shift. Basically they took the old fashioned governor assembly off the rear and put in an electronic control for it to make it shift. It is a wierd control system by all acounts as the pressure control actually controls the shifts and not line pressure per say so much.