HiTempguy wrote: manual trannies can't handle the powa (hence why they aren't offered anymore and for the last years the dodges were detuned for torques with the 6 speed)
Actually this is slightly misleading. A couple quick points.
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Manufacuters have been derating engines in first and second gear for some time. Both on auto and manual transmission variants. Dodge was derating the 6.7 in 1st and 2nd back in 2007 in the auto trans model. I'll bet ford and chevy are doing the same.
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Beyond the clutching and shifting mechanisms transmissions are pretty similar. Gears are gears and shafts are shafts. To say a manual transmission cannot hold the power is silly. Most over the road trucks are manual transmissions or automatically shifted manuals. My old ISX did about 500-600hp with torque available up to 1700-2000ft-lbs. what really prompted the shift I auto's is that the new transmissions no longer give up mpg to a standard, and torque delivery can be managed by the truck and not the driver. Basically they couldn't design a clutch system that would be acceptable to the wussified modern left leg and could hold up to the abuse. The modern trucks are just too powerful for the average idiot wanna be cowboy who buys a diesel truck for Home Depot runs.