Three on the tree w/overdrive - Chevelle Tech
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post #1 of 10 (permalink) Old Mar 20th, 17, 1:40 PM Thread Starter
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Mike
 
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Three on the tree w/overdrive

I always wondered how the overdrive worked. I have never seen one before. enjoy!
Here's the rest of the car - https://denver.craigslist.org/cto/6042715857.html
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post #2 of 10 (permalink) Old Mar 20th, 17, 2:29 PM
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James
 
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Re: Three on the tree w/overdrive

My 68 El Camino has this same set up but I have never tried the overdrive.
James
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post #3 of 10 (permalink) Old Mar 20th, 17, 2:51 PM
Brad
 
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Re: Three on the tree w/overdrive

I had that same tranny in a '57 Chevy truck that I had... It was like having a fourth Gear . Mine was setup to kick-in when I let off the gas at the top of third, then accelerate like you shifted into 4th. Then it would kick down to 3rd when I stuck it to the floor... the switch was mounted on the carb. inline with a flat plate on the throttle. Worked Great.
Lots of fun... nice car
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post #4 of 10 (permalink) Old Mar 20th, 17, 10:36 PM
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Tom Terrific II
 
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Re: Three on the tree w/overdrive

Those OD units are cool. I've been looking for one for ages, no luck. They can be mounted to a Saginaw 4 speed too, it's just a little work.

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Last edited by Tom Mobley; Mar 21st, 17 at 12:43 AM.
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post #5 of 10 (permalink) Old Mar 20th, 17, 11:02 PM
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Devin
 
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Re: Three on the tree w/overdrive

Quote:
Originally Posted by Tom Mobley View Post
Those OD units are cool. I've been looking for one for ages, no luck. They can be mounted to a Borg 4 speed too, it's just a little work.
Hey, me too! Nobody seems to keep a spare 3 speed under the bench anymore in case they break their 4 speed!

Devin
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post #6 of 10 (permalink) Old Mar 20th, 17, 11:32 PM Thread Starter
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Mike
 
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Re: Three on the tree w/overdrive

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Originally Posted by 64SS427 View Post
Hey, me too! Nobody seems to keep a spare 3 speed under the bench anymore in case they break their 4 speed!

Devin
For $2200 there's one in Colorado!
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post #7 of 10 (permalink) Old Mar 20th, 17, 11:41 PM
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Al
 
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Re: Three on the tree w/overdrive

I have history with the 3 speed overdrive in my 57 Chev some 50+ years ago. Great combination as described above. I had 4.11:1 gears so with the overdrive it came out to a 2.88:1 axel and would get reasonable gas mileage. The great part about it was I could shift it like a 6 speed with 1st, 1st over, 2nd, 2nd over and 3rd and 3rd over. I had a wide ratio 3 speed on the column so the gear split was pretty even. Could have been done with some kind of floor shift but I left mine on the column in the day.

Fast forward to today. I just bought a 57 Chev with the three speed on the column. It has 4.56:1 rear end gears and close ratio gears in the transmission. The difference between a standard 3 speed and the close ratio is profound; 2.94:1 first gear vs. 2.20:1 in the close ratio. The close ratio transmission with 4.56:1 gears is, as I understand it, a drag race combination. I have yet to drive it any distance in the car as I have the engine out going through a cosmetic up-grade. When I get it back together I want to show it so driving it will be necessary. The 4.56:1 gears will make any freeway speeds a bitch with engine RPM's running at 4000+. I talked to my transmission guy about getting me an overdrive three speed to use for road work and he's on the hunt for one of these. If anyone out there has one please let me know as I'm in the market for one.
Thanks
Al
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post #8 of 10 (permalink) Old Mar 21st, 17, 1:59 PM
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Don
 
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Re: Three on the tree w/overdrive

I installed one in my '72 I had about 6 years ago. I bought the 3-speed Saginaw with the BW R10Q from John's Muscle Cars in Wymore, NE and it worked pretty good. I needed to change my rear end gears to 3;4xx or higher to take full advantage of the OD (I had 3.08's) but other than that it was pretty cool to have. I had to make my own harness, but wasn't very difficult.

Don
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post #9 of 10 (permalink) Old Mar 21st, 17, 7:23 PM
 
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About the buy a 66 137 283 with this option. Can wait to get it this weekend. All original never taken apart. Everything is there.
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post #10 of 10 (permalink) Old Mar 21st, 17, 9:13 PM Thread Starter
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Mike
 
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Re: Three on the tree w/overdrive

Quote:
Originally Posted by Thebradz28 View Post
About the buy a 66 137 283 with this option. Can wait to get it this weekend. All original never taken apart. Everything is there.

Please post pic's when possible...Is it a Concours 4-door station wagon? Sounds like a cool combo.
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