Steve,
We have the 10sp Autoshift. With the load that I am pulling (27,000 lbs +) I felt more comfortable with the Eaton 10sp. If I were going with a new truck then I might get the full auto but I went with something I can work on if the need ever arises. I am not sure on the measurements. You could call Jason at Quadra and he could tell you.
Good luck
Wick
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