Here's my problem. Just blew third gear again in the NV4500. This is the fifth time now. To much power and weight. Need to upgrade the transmission now. I am leaning towards the G56 as it seems that the NV5600 is getting hard to find. What's needed to swap the G56 in place of the NV4500? I already have a South Bend Clutch in it (13" flywheel). Do I need a new clutch, flywheel? What about the clutch slave, starter. The truck is a '99 Dodge 2500. 4x4, cummins, edge juice w/attitude, 40hp injectors, hx35/40 turbo. Sitting on 35"s and 3.54 geared. It's weights in a @9000lbs (service body,welder,compressor,tools). Tow around 12,000lbs with it.