Does anyone know if there is an aftermarket manual transmission for the 4th gen ram 3500 that would be capable of providing the 30,000 lbs towing?

 

you can adapt an eaton/fuller trans in there, but it's not going to be easy...

or just put a G56 in it.

 

30,000 pounds?
South bend makes excellant clutch up grades and G56 IS a stout manual transmission.
Flywheel has to be comparable with a after market transmission, G56 bolts up....

Front ends on solid axle rams will never last long enough to even consider restrianing 30 thousand pounds.

 

only trans i would even consider trying to lug that much weight would be an eaton fuller. there is a guy on cumminsforum and pirate4x4 who is/has swapped an eaton for his nv5600.