will not shift for 1st-2nd till 3500 unless lightfooting throttle on 1999 Dodge Ram 2500

also will downshift from 2nd-1st way too easy on hill or any reason too much throttle. all other gears OK. only 82.000 miles on my camper hauler. torque converter seems to lock in and out a lot with a twitch of the throttle but has always done that. no codes.