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Re: [A/S] Allison Transmission Grade Breaking
A diesel truck does not "freewheel" downhill. It has compression
braking, like a gas engine. Just not as much. Shift it down and it
will slow, very much like a gas engine. Even with the rather steep
grades here in the Ozarks I have never had a problem with my 25'
Airstream trying to push my '94 Chevy diesel down hill.
If I had a much heavier trailer I would probably want an engine
brake, however.
Mark