I have decided to buy an 05 2500 CTD. I was wondering If anyone knows exactly what the AHD, snow plow prep is. I found one at Perkins here in Colorado Springs and it definatly sat higher ;that is how I noticed it, and had a different part number on the front coils. I can't be exact since it has been a month ago. I have decided to get an 05 and want ot make sure before the dealer goes to looking around. I have another since it has been one year ago since the buy back on my 04 CTD. The neighbor just traded his Ford on an 05 Big horn CTD and I guess it is my turn.