TSuter said:
Daniel,
Here are some adj from a prior post. I've done them to mine and didn't have anyproblems.
https://www.turbodieselregister.com/forums/showthread.php?t=59225&highlight=trans+adj
Tom
Wow!!! That brings back memories of looking for answers.
The adjustments to the line pressures are part of the equation for a long transmission life. That 8 to 10lbs makes a big difference in clutch slip and shift feel. Along side the pressure screw on the VB is another screw that will change the shift point of OD.
Increase the line pressure a bit and move the OD engagement up 5 mph and the OD was a lot happier and lived a lot longer especially if towing was frequent.
Also, the TV adjustment was all too often ignored as a tuning device. Moving that throtle pressure up allowed more rpms hence more pressure on shifts. Far too often it is set too loose and the shifts get lazy and tend to slide into gear under power instead a firm quick apply.
By tweaking the line pressures, OD shift, TV pressure, and the TPS setting one could tune the trans to hold gears longer and spread the shifts out when running a lot of throttle and/or a big load while still shifting quickly and firmer when running empty and less throttle. This really helped the weak spot in the OD and kept it from burning itself up prematurely.
Along with swapping the accumulator piston, leaving out the spring opens up anothr scenario that can be debated, if one felt competent removing the OD an reshimming the OD apply clearances added even more ability to take the power the Cummins was capable of with even mild BOMBing.
Daniel, aside from a bad converter the 100k pump would be my guess about the mpg and throttle position thing. Just because it runs good and makes 22 psi doesn't mean it is doing it efficiently or even correctly. Advancing the throttle and eventually the fueling curve will cover lot of timing and delivery problems but at the expense of mileage.
Attention: TDR Forum Junkies 
