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03-07-2012, 08:57 AM | #1 |
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Join Date: May 2010
Location: Green Bay, WI
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Early Ford three speed tranny question....
Ive got a three speed side shift open drive tranny from a 51 F-1 with an 8BA.
I wanted to turn it into a closed drive tranny to put in a 46 Ford car. I gutted the F-1 tranny and put all the guts from a 39 Ford tranny into it. Cluster/mainshaft/reverse/early style 2.75" syncro. Everything fit great. Now comes the shift forks. The sideshift shift forks are too wide. The opening on the front one is 3.125", and I didnt measure the rear one. Im thinking I can close them up with some heat and a vise and make them work, but Im sure someone here has done the same thing so let me know what you think. This is a low buck assembly using what I have laying in the parts stash. Probono work for a friend. THX, Rob |
03-07-2012, 11:37 AM | #2 |
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Re: Early Ford three speed tranny question....
This won't work. The side shift trans uses the later hockey puck synchro which is bigger and has the fork slot toward the rear edge. It is about 1/4 inch behind the earlier donut synchro which has its slot in the center. So even if you narrowed the fork, it would be in the wrong location.
the cleanest solution is to use the gears from a real 39 up trans which has the hockey puck synchro. You might be better off mig welding .1 inches on to the big fork instead of trying to bend this hardened unit. The mig weld is a lot harder than a gas weld. The rear fork will be all right. Either that or figure out a way to move the fork 1/4 inch forward, pehaps by welding the earlier narrower fork in front of the side shift fork cut down where it spreads out. Check to see if this moves the fork 1/4 inch forward. |
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03-07-2012, 01:14 PM | #3 |
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Location: Ballston Spa, NY
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Re: Early Ford three speed tranny question....
You have to use the later syncronizer that matches your shifter forks. It's really tough to alter the forks in any way and make them work properly. Good luck..
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03-07-2012, 01:55 PM | #4 |
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Re: Early Ford three speed tranny question....
I don't think you even want to try what you are suggesting. Best thing you could do is contact either Mac VanPelt or Charlie ny and get them to advise you on how to accomplish what you are trying to do. There is a way but unfortunately you are presently heading in the wrong direction.
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John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein |
03-07-2012, 07:35 PM | #5 |
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Join Date: Jun 2010
Location: San Antonio, Texas
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Re: Early Ford three speed tranny question....
There is a lot of interchangeability in the old Ford tranys but the main shafts are different between the open drive types and the closed drive types. The side shift closed drive transmissions are basically all the same from 1940 to 48. There are still a bunch of them out there. Mac VanPelt's book will answer any question you might have about the passenger car & commercial car transmission up to 51. They all changed gears after that.
Last edited by rotorwrench; 03-08-2012 at 09:11 AM. |
03-08-2012, 09:06 AM | #6 |
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Re: Early Ford three speed tranny question....
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I've done similar work modifying a 34 top forks to work with the later gear set with the later synchro. |
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