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Tranny: SM420, twice the weight and half the size of a modern tranny. Can be found in 1/2-2 T vehicles including some large dump trucks. SM465 slightly larger but has a higher first gear and can more easily be found. Or go modern with an NV4500 or NV5600.
Xfer:
Atlas, NP205 for absolute strength, D300 for better gearing or maybe just shell out and get an Atlas.
Best is subjective and dependent on available funds and the platform it is being installed into. Availabuility not of the big pieces but rather the bell and adpters will be the hardest part to source.
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