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02-15-2024, 09:31 PM | #1 |
Senior Member
Join Date: Jun 2010
Location: east Tennessee
Posts: 363
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Closed drive shaft
I have a 1939 with the original closed shaft setup. What is involved in changing to open drive shaft setup. I have a transmission that is for open shaft, that I plan to install.
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02-15-2024, 09:43 PM | #2 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,950
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Re: Closed drive shaft
Randy, This will help.
https://www.bing.com/search?q=how+to...ANAB01&PC=HCTS |
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02-15-2024, 09:47 PM | #3 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
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Re: Closed drive shaft
Quote:
You are lucky in that, on this forum over the years there have been literally hundreds of posts on that exact subject. Try the search function. It will take you most of the night to read it all. |
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02-16-2024, 08:04 AM | #4 |
Senior Member
Join Date: May 2010
Location: middle of Iowa
Posts: 647
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Re: Closed drive shaft
Can I ask what transmission you want to use?
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02-17-2024, 07:57 AM | #5 |
Senior Member
Join Date: Jun 2010
Location: east Tennessee
Posts: 363
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Re: Closed drive shaft
I have a three speed, top shift case 78-7006, that needs to be rebuilt. I hope to rebuild it with synchronized gears.
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02-17-2024, 08:29 AM | #6 |
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Join Date: May 2010
Location: Alabama
Posts: 3,261
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Re: Closed drive shaft
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02-17-2024, 10:39 AM | #7 |
Senior Member
Join Date: Jun 2010
Location: east Tennessee
Posts: 363
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Re: Closed drive shaft
If I decide to keep this transmission as a backup for my 1939 pickup, what can I change to adapt it for use on the closed shaft setup on my truck? Appreciate the advice and suggestions.
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02-17-2024, 12:07 PM | #8 |
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Join Date: May 2010
Location: on the Littlefield
Posts: 6,159
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Re: Closed drive shaft
The output shaft and the rear housing from a matching gear / synchronizer style for closed driveshaft
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02-17-2024, 08:23 PM | #9 | |
Senior Member
Join Date: May 2010
Location: NJ
Posts: 6,181
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Re: Closed drive shaft
Quote:
If I were you, stick with the closed drive trans set up currently in your truck. You are not gaining anything with the Ford open drive and you will need to do some fab work to the center cross member and figure out how to stabilize the rear, split the wishbones, etc. The wishbones alone are not strong enough to hold the rear in place long term. |
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02-17-2024, 08:25 PM | #10 |
Senior Member
Join Date: May 2010
Location: middle of Iowa
Posts: 647
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Re: Closed drive shaft
Much simpler to change a few parts in the transmission with wrenches than to rework the X member and rear suspension with saws and welders.
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02-17-2024, 09:34 PM | #11 |
Senior Member
Join Date: Jun 2010
Location: east Tennessee
Posts: 363
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Re: Closed drive shaft
After considering all advice, I think I will be better off to stay with the original closed shaft set up. My setup in my 1939 Ford pickup does pretty good(it jumps out of gear some). I was able to obtain a top load transmission that looks to be a 1948. Previous owner took it apart because some gears are chipped and never put it back together. I would now like to rebuild it and have it as a backup for my truck. Besides damaged gears, what parts do I need to change out. Where can I get the used “Main Shaft Bearing Retainer” #78-7085 B? Thanks for the help.
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02-17-2024, 09:50 PM | #12 | |
Senior Member
Join Date: May 2010
Location: NJ
Posts: 6,181
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Re: Closed drive shaft
Quote:
First things first. Order the transmission rebuilding book by member Mac VP. Jumping out of gear is an indication that your transmission needs to be rebuilt, so sooner or later you'll be faced with this task. If you have mechanical ability, Mac's book walks you through the process step by step. Best part, he has all the parts you need for the job. Mac's book will also help you identify what you have with the spare trans. Don't trust anyone's word for it. Make sure by ID'ing the parts that you have. These parts look similar to the eye, but can be very different if the tooth count isn't confirmed, etc. |
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02-17-2024, 10:49 PM | #13 |
Senior Member
Join Date: Nov 2011
Location: Sonoma, CA.
Posts: 1,497
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Re: Closed drive shaft
Ditto on Mac's there are a lot of things that have to be to spec to make it all work.
He will take you thru all of them. |
02-18-2024, 07:24 AM | #14 |
Senior Member
Join Date: Jun 2010
Location: east Tennessee
Posts: 363
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Re: Closed drive shaft
Thanks for the advice on Mac’s book. I ordered it and received it yesterday. Great service.
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