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View Full Version : What does HMD stand for in an HMD 4L80-E trans?


Scrufdog
03-19-2006, 09:56
What does HMD stand for in an HMD 4L80-E trans?

Topic pretty much sez it all. At first I was thinking Hydra-Matic but there is no D in that.....
stumo
03-19-2006, 21:03
Hydra-matic Divison of General Motors?
Mark Rinker
03-20-2006, 09:31
Hydramatic Drive, perhaps?
Heartbeat Hauler
03-27-2006, 08:45
Well Hydramatic is one word and the only thing that I found when searching was: hydraulic motor-driven transmission.
JP
stumo
03-27-2006, 18:20
"Hydra" and "Matic" have been used both together as one word and as two words hyphenated. GM's current website uses the hyphenated version but no mention of HMD that I could find.

At one time I think H-M was an actual division of GM but now it falls under the GM Powertrain umbrella. Any tranny techs here that have some old memorabilia around?

stumo
Mark Rinker
03-28-2006, 07:19
How about:

Hazardous Mated (to) Diesels?