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Old 10-20-2016, 09:04 AM   #21
19Fordy
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

Wonder why the manufacturer of those .747 shafts can't just make them .749 instead?
I guess they have hundreds of .747 shafts they now need to sell, no matter what. Where and who makes them?
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Old 10-20-2016, 01:05 PM   #22
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

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Wonder why the manufacturer of those .747 shafts can't just make them .749 instead?
I guess they have hundreds of .747 shafts they now need to sell, no matter what. Where and who makes them?
Probably because they started with some standard .750 stock material - needed to take of .003 to get to a desired surface finish. (And the finish is NOT very good if you ask me!).
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Old 10-20-2016, 02:23 PM   #23
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

McMaster Carr catalog shows some precision shaft material with the right diameter tolerance and hardness with machinable ends (2") in lengths from 10" to 36". Might be an option.
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Old 10-20-2016, 03:24 PM   #24
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

bill, could you post an item number, i couldn`t find the material you referenced.
thanx, tom
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Old 10-20-2016, 03:33 PM   #25
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

When I rebuilt my '39 transmission for my '37 a few years ago I used Loctite to seal the ends not silicone.The Loctite is green and made for this type of application and yes they can be removed but it does work and has for last 10 years.
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Old 10-20-2016, 04:17 PM   #26
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

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Bored&Stroked, et al: I'm having my shafts tapped for the 10/32 screws and will use caps as you describe, maybe with a gasket under them. 37 Coupe reports using green loctite to seal his shafts with success 10 years ago. Researching green Loctite, it appears that it has a wicking property. What would be the pros and cons of applying the green Loctite around the installed shafts/case then apply the RTV and caps after it has cured? I just want to whip these drips the first time. Thanks to all who contribute to this timely (for me) thread.
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Old 10-20-2016, 04:56 PM   #27
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

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McMaster Carr catalog shows some precision shaft material with the right diameter tolerance and hardness with machinable ends (2") in lengths from 10" to 36". Might be an option.
What you're probably looking at is actually Thompson precision linear bearing shafting - 1566 grade material, C60 hardness (case hardened) and machineable ends. I talked to their application engineers about this application and they believed it would not be a problem. Time will give us the final answer on that!

This is exactly what I used to make these shafts. It is not a cheap material, but when you think about all the other costs (gears, synchros, etc), not a bad way to go. I've found that you really need carbide drills to drill the 1/4" through hole, the center drilling can be done with cobalt bits and the taps were done with normal taps (the centers are not hard).
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Old 10-20-2016, 04:59 PM   #28
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

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Bored&Stroked, et al: I'm having my shafts tapped for the 10/32 screws and will use caps as you describe, maybe with a gasket under them. 37 Coupe reports using green loctite to seal his shafts with success 10 years ago. Researching green Loctite, it appears that it has a wicking property. What would be the pros and cons of applying the green Loctite around the installed shafts/case then apply the RTV and caps after it has cured? I just want to whip these drips the first time. Thanks to all who contribute to this timely (for me) thread.
I pondered using Loctite 660 shaft repair - as it would "fill and lock" in the shafts into the case, but because I had such a nice and consistent fit (new shafts to the case), decided that the end-caps were enough. I can't see an issue with some sort of 'stud and bearing' mount compound - just decided that I didn't need it AND the caps.
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Old 10-20-2016, 05:21 PM   #29
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

Quote:
bill, could you post an item number, i couldn`t find the material you referenced.
thanx, tom
Here is a link to the Mcmaster catalog page:
http://www.mcmaster.com/#steel-preci...hafts/=14omrep

Well that link gives you too many options; you have to click on the last item:
Linear Motion Shafts with Machinable Ends
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Last edited by BillM; 10-20-2016 at 05:27 PM. Reason: Added info for link.
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Old 10-26-2016, 04:21 PM   #30
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

My machinist (retired machinist neighbor) couldn't tap my shafts, so he silver soldered studs in them. I used the green loctite around the shafts and on the nuts. I put two paper gaskets skimmed with sealant and filled the void at the shaft ends with sealant. Hoping all this together will eliminate the transmission leaks.
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Old 10-26-2016, 08:06 PM   #31
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

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Originally Posted by 40cpe View Post
My machinist (retired machinist neighbor) couldn't tap my shafts, so he silver soldered studs in them. I used the green loctite around the shafts and on the nuts. I put two paper gaskets skimmed with sealant and filled the void at the shaft ends with sealant. Hoping all this together will eliminate the transmission leaks.
That is a good idea - should work with shafts that are through-hardened like the stock ones. Good stuff to share here!

D
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Old 10-26-2016, 08:13 PM   #32
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Default Re: 1939 Trans Rebuild - Shafted Again! (with a twist)

Now if you can stop the leaking that will eventually come from the bearing retainer and clam area that will be great ; o)
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