If you tow a lot you may want to look into GDE's towing programming for your TCM (tranmission control module) that holds gears longer and highter shift points
If you get a better torque converter either Chrysler's or a Sun Coast's, then GDE's full torque tune is in order.
Dr Tranny was talked about a few years ago and worked well for some.
The shudder and slipping is caused by the engine's torque curve is high at low rpms.
I tow our 3500# camper with the Chrysler's TC and new front pump and GDE's full torque tune. I have 2 TCM's, one with the later shift points that has the F37 programing that cuts fuel mileage but I find the later shift points are good when towing. The other TCM has one of the original versions of the original programming all 05 and 06 CRD's came with. It gives me 4 mpg better city mileage but shifts too low for good trailer towing.
I know there were at least two versions of original programming and maybe more.
Ideal would be two tcm's installed with a switch so either could be selected. It's a pain to swap them out.
Oddly enough my 1993 VW Eurovan has a switch that changes shift points with the flip of a switch. That would be nice on our CRD's
If only our OD Off switch could be made to operate this way
