OK so as the title says I have a 1999 5.9 R/T.
The tranny has been acting up in the last few days and having an ir-regular shift pattern.
Fluid just changed 5k ago and the level is full and the truck is not beaten.

Is this gonna cost me a few $$$$?

Should I start looking for a tranny?

What is the "Model "number of the that came in these trucks?