I know up til 1999 you could only get the plow prep on regular cab trucks if they had a cummins engine. When they upgraded the axle to 5200 in 2000 then you could get the plow prep across the board on all 2500s,and only 3500 reg cabs still. The plow prep had 241HD t case on 2500s,marker lights on 2500s,a trans temp light,and HD front springs on all models. The HD service group was required,but the Cummins trucks already had it. The plowprep is misleading IMO,becasue the weight limits are so low that a truck of this size needs a HD plwo. and the limit is around 640lbs for the plow! Any good plow comes in at over 750lbs,only Snow way has managed to build a plow that meets the weight requirements and is strong enough for these trucks. Im including a pic of my old plow setup (a 980 lb 9'2" Boss V),this plow served me well,and the Ram carried it great,my new setup is a 810 Blizzard,so far its done even better than the Boss.