Can’t seem to find any answers so I’ll ask you guys. I have a 98 Ram 2500 24v Cummins automatic tranny. Have problems with it going into drive and stalling no problems with reverse. But when I engage my torque converter lock up switch while switching into drive I have no problems. So could that be a torque converter problem or a problem with the switch. 

sounds like the torque converter lockup labeling is reversed on the switch.

Un hook the mystery switch from the wire between the transmission and the PCM and see what happens.  If you have a good lock up clutch in the torque convertor the engine will stall if it is locked up when stopped.