Although the truck left the assembly line packing a G56 six-speed manual transmission, it was scrapped long ago. After destroying four gearboxes—a common problem when the G56’s aluminum case is exposed to the earth-twisting torque a modified Cummins creates.
But before the six-speed swap took place, the NV5600 was torn down, its internal parts were cryogenically treated for stress relief, and the gearbox was rebuilt.
The ’05.5 and newer Ram trucks were equipped with the G56 six-speed transmission—Jake’s being one of them—which is notorious for failing when subjected to high torque loads (i.e. from a modified Cummins in front of it). After replacing the G56 on three separate occasions, an NV5600 swap was performed. And not only that, all of the NV5600’s internals were cryogenically treated by Zumbrota Bearing And Gear (ZBAG) of Zumbrota, Minnesota prior to being installed.
SO... ever hear of cryogenically treated gears? I haven't. But they are a thing