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When I bought my 2005 Ram diesel, I was told that the only difference between the 2500 and the 3500 was the spring package, PROVIDED I got the Cummins diesel engine. I was told that the hp and torque of the Cummins diesel was too much for anything lighter than the 3500 running gear, hence the 11.5 inch AAM axle. The 2500 with the Hemi gas engine comes with the smaller 10.5 inch AAM axle. So, if you get the diesel engine option in the 2500, I believe you are correct that the only difference between the 2500 and 3500 is the springs.
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