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3 speed with overdrive #5381443 03/20/20 04:56 PM
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supton Offline OP
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Once in a while I get a bug and look at old vehicles that I know I will never buy. That disclaimer out of the way:

From what I can tell, the overdrive option for 3 speed manuals goes back to the 30's, and was somewhat popular in the 50's, and was available through the 60's. Not surprising, even with cheap gas, there have always been those who travel "a lot" per year.

What I don't get is the limitations of them: apparently they could roll away if left in gear, and they were known to freewheel the engine during coasting. I think... I'm not sure why, nor if that was always the case, nor if some judicious mods would fix those problems. I think there was a lever to disable OD and in which case it acted just like a standard 3MT. And I've read that there are some who have disabled the governor and use full manual control so as to split the gears (which is nice as OD was 30% and gearing splits in the trans was more like 60%), but what I don't know if full manual control defeats the freewheeling issue during cruise in 3rd/OD.

shrug

[Yes, I know about the 833 4MT with OD that was used in the 70's and going into the 80's. But AFAIK none of them were 3 on a tree cool. smile ]


2011 Toyota Camry, base, 2.5L/6MT, 203k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 158k, ours
1999 Toyota Camry LE, 2.2L/4AT, 223k, his
Re: 3 speed with overdrive [Re: supton] #5381473 03/20/20 05:31 PM
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Farnsworth Offline
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Pulling the lever out of overdrive, which has to be done while the engine is pulling out of overdrive or the car is stopped,, makes the transmission like a normal manual with gear hold back. Putting into overdrive the handle can just be pushed in. Overdrive would be available around 30 mph and over, and you just let up on the gas and it drops in. Flooring the gas will downshift it out of overdrive.
Free wheeling was while in overdrive starting below the engage speed like 25 mph. Compression braking would just be up to that point then the OD would freewheel below that. Taken from memory. All the first cars I had had this setup, really liked it.

Re: 3 speed with overdrive [Re: supton] #5381478 03/20/20 05:36 PM
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CR94 Offline
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Operating that option is described on page 5 of my 1962 Chevrolet owner's manual.


2011 Toyota Prius now at 110K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: 3 speed with overdrive [Re: supton] #5381507 03/20/20 06:12 PM
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supton Offline OP
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Ah, so freewheeling is only if OD is allowed to engage on its own, and below 25-30mph (give or take).


2011 Toyota Camry, base, 2.5L/6MT, 203k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 158k, ours
1999 Toyota Camry LE, 2.2L/4AT, 223k, his
Re: 3 speed with overdrive [Re: supton] #5381521 03/20/20 06:28 PM
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Farnsworth Offline
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1940 Hudson, they tell about operation within all the mechanical details.

http://hudsonterraplane.com/tech/1940/1940TransmissionOverdrive.pdf

Re: 3 speed with overdrive [Re: supton] #5381525 03/20/20 06:30 PM
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CR94 Offline
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I take it (from the '62 Chevy manual, as well as Farnsworth's comments) that the car freewheels any time the overdrive control is not locked out, road speed is above ~25-30 mph, and the accelerator is released.


2011 Toyota Prius now at 110K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: 3 speed with overdrive [Re: Farnsworth] #5381809 03/21/20 06:48 AM
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supton Offline OP
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Originally Posted by Farnsworth
1940 Hudson, they tell about operation within all the mechanical details.

http://hudsonterraplane.com/tech/1940/1940TransmissionOverdrive.pdf

Thanks!


2011 Toyota Camry, base, 2.5L/6MT, 203k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 158k, ours
1999 Toyota Camry LE, 2.2L/4AT, 223k, his
Re: 3 speed with overdrive [Re: supton] #5381966 03/21/20 09:50 AM
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Cdn17Sport6MT Offline
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Wondering if a 1940 Hudson has a synchromesh transmission... Wasn't Borg Warner synchromesh only introduced in about 1938... in an Oldsmobile?


Mazda6 GX (Sport in the 'States), 6MT, 2017
Moto Guzzi 850 T5 (Euro version), 1985
Honda Civic Si (EX 2 dr. in the 'States), A/T, 1997
Toyota Camry CE, 5MT, 1999
VW (Type2) Kombi, 4MT, 1979
Re: 3 speed with overdrive [Re: Cdn17Sport6MT] #5382125 03/21/20 01:02 PM
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ffhdriver Offline
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The free wheeling was hard on the battery because the generator was not charging at idle especially with lights on.

Re: 3 speed with overdrive [Re: ffhdriver] #5382232 03/21/20 03:24 PM
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CR94 Offline
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Originally Posted by ffhdriver
The free wheeling was hard on the battery because the generator was not charging at idle especially with lights on.
Probably the bigger complaint was accidents caused by idiots overheating brakes descending mountains with overdrive engaged, thus freewheeling.


2011 Toyota Prius now at 110K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
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