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It seems that the thicker rotor is on the 3500 DRW trucks. I have tried hard to find the difference between the 3500 SRW and the 2500. The think that I find most odd is the 3500 SRW has a lower curb weight than the 2500. I don't see how that can be. One other thing, the 3500 SRW manual W/ 373 gears had a lower GCVWR than the 410 geared trucks in 2005, when the G56 came out, you couldn't get the 410 gears with it, so all you had was the lower GCVWR with the manual trans. For 2006 the G56/373 geared truck was rated at the higher GCVW, but no mechanical difference between the years. Does that mean that a 2005 truck with a G56 has the same GCVW as the 2006 trucks with the manual?
I'll go with what I first heard when the 3rd gens first came out, you can no longer get the "camper pkg" (overload spings) in the 2500, The "camper pkg" is now a 3500 SRW
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I have noticed the same thing on the tow ratings. When they went to the G56 mid '05 the final ratio with the 3. 73 was nearly the same as previous 6 speed with 4. 10 gears. This would explain why '06 6 speed 3. 73 rear end would have the higher tow rating. I believe the mid year '05 6 speed tow rating publications were never revised.
One other note,I think the aluminum case G56 is almost 100lbs lighter than the steel NV5600,(lighter curb wt).