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I have an NV5600 in my soon to be put out to pasture '04. At the time, there was no new tech alternative. Now there is. Automatic transmissions have come a looong way. At a minimum you will replace clutch/pilot/throw out from time to time with a handshaker if you keep the truck for any real length of time.

The Aisin is used in some medium duty applications and longevity is important to me (324k mi on '04) so it gets the nod from me.
 

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I must say I do tire of the 3.42 naysayers. "the motor will be lugging" kills me the most. If a motor makes peak torque at or near 1500, it damn sure isn't lugging at 1500. 900rpm maybe. 1500, NOT.
 

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The latest versions ('13) of these transmissions have virtually identical 6th gears. The G56 has a slightly shorter 6th.
 
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