Just had Dodge store install Re-man Trannie in this 1997 Cummins. OEM trans had 392K on it with sudden downshifting and shuttering in stop and go traffic. Re-Man is doing a little of the same thing. Tech says its the TPS going nuts. Anyone had this problem ? Thanks Two
tranny fluid leak on tranny temp sensor shorted it and caused sudden downshifting at highway speeds - it wasn't pretty. tranny flush 'n' fill and lines re-connected with new temp sensor resolved the bucking and snorting issue, but did not cure the TC lock/unlock problem - new TPS solved that problem.
Takeaway: you may be experiencing multiple malfunctions that are interrelated
I replaced the TPS in my '97 from RockAuto.com at significant savings over other suppliers. I still have lock-up issues however. There are "voodoo" fixes like tin foil on wires near the TPS and making sure there is no corrosion on battery cables and terminals. I have fought this fight for years and it is never really gone. It is tempting to hard-wire the torque converter which someone posted how on this forum years ago. i can't find it today, however...