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Can I ask if you can use a T56 or TR6060 on medium-duty applications?
Gearing of these transmissions are tall (add a underdrive unit?) but I like their spacing and double-overdrive
that is geat for hypermiling on high speeds.
Need suggestions here. :)
 

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From what I saw of the ratio coverage and the torque rating, it should be a great transmission for the street with a 53 series engine . Ratio coverage for a work truck is questionable as 1st gear ain't much, unless used with a 4WD transfer case. An RTO 610 or 6610 or the Spicer 7 speed OD is a lot more practical, and probably a lot less money .
 

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Medium duty? What kind of weight are we talking? They are fast and light. They don't like a lot of torque or weight.
 
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