[patrickk1]

Originally Posted by spacedebris

This will not work. Not for the issue at hand anyway. The problem is not the frame. If you want another frame thats fine, but it will not solve the space issue. The problem is the physical room under the hood. The distance from firewall to radiator support is not sufficient to mount a 12v. Now if you do not clearance the firewall, then you would have to push the radiator support forward, which would move the fenders forward, which means stretching the fenders.

Oh you could move the radiator and inter-cooler forward slightly but not enough to make much difference. the 12v is just about 1 foot too long for the engine compartment (radiator in stock location). With a bit of work you likely could move the radiator forward a few inches but not a foot. Dont forget that you also have to figure in clearance for the steering as well and that sort of limits how far forward you can push the engine.

At no point did I state that no firewall modifications would be necessary. Others had stated that they would be needed so I did not feel the need to repeat that. I was addressing the OPs original question concerning swapping his cab to a cummins frame. It has been done in a gen1 ram frame and would work in a 3rd gen ram frame (I have had the cab on the frame).