03 had an option of 10.5 or 11.5 ring gear. Be sure you're getting the proper locker for your truck! I have an 03 diesel 2500 in the shop right now, it has a 10.5!
I have a 2004 Dodge 11.5 SRW AAM complete minus pads. Never used for pulling or drag racing. Converted mine to a dually. I am in Mid GA. $750 I am going to Ohio in Aug.