Hi Kevin:
This sounds like your engine, not the transmission.
The Cummins was designed to produce max hp and torque at very low rpm(s).
However, the smoking, and lack of engine response lead to the injectors, or injector pump as the first source of your problems.
You can service the transmission yourself, and this is not a bad idea. I have mine serviced once a year, regardless of miles driven. Cenex in Conrad Montana does this for $85 (I supply my own Amsoil synthetic trans fluid, but many of my trucker friends run 15-40 in theirs).
Bottom line, I think your first look should be at the injectors.
Safe Travels
Rick
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Safe Travels
Rick
07 TM 40D;ISL 450 Cummins(upgraded). Very happy w/coach
Gnarly toad to scoot around.
Geocaching, hiking, fishing, National Parks, Civil War sites.
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