On our way home from a road trip today, cruised for about an hour and a half at 70mph. We got off the highway and go to take off from the stop, and it takes off in second gear and would not shift. I pull over and check the fluid, it looks fine, smells fine. I take off, and now it does not have first gear, but seems to shift/run fine in all other gears. I did notice a week ago that it would hunt @ 45 mph alittle. Thinking maybe the govn solenoid in the trans has gone out...I think I might change the oil and filter, been @ 50k since it was done. And change the two solenoids in the trans, and cross my fingers....Any other ideas?

Error Codes?

just checked codes... p1762 and p1693 the 1762 looks like the govn pressure sensor...have to find the 1693 code yet

You mean this. http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/231-p1693-dtc-detected-in-companion-module I seem to be missing the P1762 code. Back to the drawing board.