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I just looked at the following trucks:
- '03 2500HD 4x4 6.0 gas crewcab shortbed
- '04 2500HD 4x2 8.1 gas crewcab longbed
- '05 or '06 3500HD 4x4 dually D-max crewcab longbed
Both of the 2500HD's have a 5 leaf rear pack, with the 5th bottom leaf being a short and thick overload (last leaf before touching the axle). The '03 is mine that I bought new and has all of the heavy duty/towing/snowplow packages on it. Just looking they seem identical.
The 3500HD has a 6 leaf pack, again with the bottom leaf being a short and thick overload that looks identical to the ones on the 2500HDs. I don't have a tape measure handy but I didn't see anything obviously different except for the extra full length leaf in the pack. It also has another single upper overload that's seperated from the 6 leaf pack and has its own contact brackets (seperate from the main springer hangers) bolted on the frame where the ends make contact if compressed enough.
The 3500HD SINGLE rear wheel trucks seem rather rare in that year range. I've never seen one in person and didn't even know for sure if they existed but found several listed on eBay, but there was probably a 10:1 ratio between duallys and single wheel versions.
So yes, there are substantially different springs available between 2500HD and 3500HD trucks at least in the '03 to '06 range (same basic body styles).
If you need it I can try to get actual measurements of the 3500HD dually springs. I think the guy is only part-time and works evening shift but I can keep an eye out for this truck.
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