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1999 dodge Cummins 2500  truck has 168k with a DDT tranny installed about 120k  miles ago . It has a smart controller installed to keep the torque converter locked up for the BD exhaust brake to slow me down while hauling my slide in camper . Third / forth gear lockup at 50 mph kicks out at 30 mph.  275 hp Rv injectors and edge  set on high about 300 hp. Tranny built for this much horsepower. This my set up.  10 amp fuse in PDF blows when key is turned on.  Has code p0753.  Relay is good  horn test.  And pin 21 on the PCM READS 33.3 OHMS. Pan has not been down yet.  I need good advice on what to do next ?

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Ok new report.  I drove the 99 hard.  3 k in the bed and 1500 lbs trailer behind.  Up some very hard  grades and  down. Pulls hard what a work-horse truck.   Not one leak life is good.  Took two months but I wasn’t taken advantage of by the best tranny shop in town    And grandkids got to go camping with their crusty old grandpa life’s good.   More camping soon.  I really appreciate all the help.  Could have never done it without you guys  Thank You