Originally Posted by T L OLSON
Is this Hydra-matic in the 54 GMC an "open" drive-shaft, or enclosed like the 53 std. transmissions and earlier?
Which Hydra-Matic?
One in a truck mentioned above?

A Hydra-Matic (and manual) transmission in a 54 1/2 ton GM truck would have had an enclosed drive-shaft.

A Hydra-Matic (and manual) transmission in any GM truck larger than 1/2 ton would have had an open drive-shaft.