someone wrote:
Be aware that for some reason Ram chose to put the new heavy duty frame only on the 1-ton trucks and the 2500 still has the old frame.
This myth will never die.
The '13 2500 and 3500 SRW share the same frame/chassis/running gear according to RAM Body Builders Guide tech sheets and Rams advertising.
In fact the '13 2500 has the same or higher tow ratings than the '13 3500 SRW. The '13 2500 Ram also has the higher FAWR/RAWR numbers than the '12 models.
Ram first issued the '13 one ton specs which lead to some folks speculating the 2500 was somehow different.