Electronic 4-71 and all the larger 71's as well as all the 92's were available and in use by civilians prior to 2000. DDEC controls they're called.
A DDEC 6v53t was available for the military, I think its the only electronic Detroit we couldn't get, but I have seen two of them available surplus.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-