AH64ID wrote:
Sorry but Ram still uses 8x6.5" bolt pattern. 2013 is the year they added 18's to the HD lineup and they fit just fine on older trucks as long as the truck hasn't been converted to manual hubs. While most of the wheels have changed from 2010 to 2014 there are a couple DRW wheels that carry the same part number between those years.
To the OP you need to get to a scale. The 18's from a 13+ will only get you up to 7K with the wheel rating, thou the tire rating may be higher. Your 03 wheels and tires will get you to 6390lbs.
I know what you are saying and I looked it up on Tire Rack myself before hand but I am here to tell you from personally switching the 18's from my 2013 over to my 2005. My factory 18's will not go on my 2005. The 17's from the 2005 did go on the 20013 but the studs were not centered in the holes and the brake calipers on the front of the 2013 scuffed the inside of the 2005 factory wheels. Here is a couple of pictures. One is of the Factory 18's and the other is with the Factory 2005 wheels that I would not drive because the lug nuts will not seat because the studs were off center. No I did not take close ups at the time. I was just trying to find a vibration problem and was trying to eliminate the tires.

