Amazing stuff Mark . Really fun read. You know your stuff. Rogo
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From: "Mark in Lakewood, CO" <beeser750@q.com>
Sender: diesel_mercedes@yahoogroups.com
Date: Thu, 1 Sep 2011 01:27:37 -0400 (EDT)
To: diesel mercedes<diesel_mercedes@yahoogroups.com>
ReplyTo: diesel_mercedes@yahoogroups.com
Subject: Re: [diesel_mercedes] Re : GM Dual Hyrdromatic Tranny
Yeah, that was the original plant in Livonia. The fire occurred in August of '53, and everybody scrambled for automatics; Cadillacs and Oldsmobiles got Buick's Dynaflow, and Pontiac got saddled with the original Powerglide from Chevrolet. Nine weeks after the fire, the new plant in Willow Run was up and running, so everybody was getting trannys again.
Rolls Royce was in a good position; they were building Hydra-Matics on their own under license.
1954 was the last year for the original, efficient Hydra-Matic. For '55, a second fluid coupling was installed, in place of one of the clutch packs, to smooth out that 1-2 shift lurch. Combined with some engine changes (including a displacement increase), Cadillac Series 62s, for instance, went from fuel mileage in the low 20s to the mid-teens. I don't know if the trucks, which used the Hydra-Matic til the mid-'60s, long after the cars switched over to the Turbo Hydramatic 350 or 400, ever got the dual coupling unit or not....
Mark in Lakewood, CO
From: "Nate" <vwnate1@yahoo.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Wednesday, August 31, 2011 7:23:43 AM
Subject: [diesel_mercedes] Re : GM Dual Hyrdromatic Tranny
Rolls Royce was in a good position; they were building Hydra-Matics on their own under license.
1954 was the last year for the original, efficient Hydra-Matic. For '55, a second fluid coupling was installed, in place of one of the clutch packs, to smooth out that 1-2 shift lurch. Combined with some engine changes (including a displacement increase), Cadillac Series 62s, for instance, went from fuel mileage in the low 20s to the mid-teens. I don't know if the trucks, which used the Hydra-Matic til the mid-'60s, long after the cars switched over to the Turbo Hydramatic 350 or 400, ever got the dual coupling unit or not....
Mark in Lakewood, CO
From: "Nate" <vwnate1@yahoo.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Wednesday, August 31, 2011 7:23:43 AM
Subject: [diesel_mercedes] Re : GM Dual Hyrdromatic Tranny
Agreed ! . this was a _fabulous_ transmission and way before it's time , it was used behind L6 engines too to great effect in millions of Commercial Vehicles as it had a 250,000 mile minimum service life.
Fuel efficient too .
Sadly , GM placed ALL their Hydromatic eggs in one basket and when that lone factory caught fine & burned to the ground , that was it ~ they couldn't supply them to FoMoCo for the Lincolns any more , nor the Indie brands that used them .
More's the pity .
-Nate
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