I have driven OTR with a 10 speed, in our MH we have the Meritor 12 speed. To be honest I enjoy shifting and all but when your driving that MH and going on vacation it sure is nice to slide the switch and go, plus now my wife can drive. In my opinon the Meritor is a superior tranny to the allison and yes I have driven the allison auto also. The Meritor is a much smoother tranny in my opinon.
I guess it comes to personal preference, as far as working on it, I wouldn't work on either, that's what my mechanic is for.
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