Joe, yes the 60-66 big truck automatics were definately different from the 1/2 & 3/4 ton transmissions. Most had no park gear and some even had a retarder brake. Again, I do not know about the AD trucks, but I would think that if they were available with an automatic it would most likely be bigger. I'm sure some of the AD experts here will know.
TruckNut
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