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08-20-2022, 10:50 PM | #1 |
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1939 transmission questions
Hi, I’m going to be putting a 39 transmission into my A. When looking into the transmission, how can I identify if it needs to be torn down and gone through? The gears look really good inside but today a small retaining clip maybe fell free??. Again, the inside looks good… I think…. but I do not know if a tear down is needed - how do you tell?
If this needs to be torn apart, where is the definitive source for instructions on how to do this? I’ve read the 35ford page but in the absence of detailed pictures, it doesn’t make sense to me. Any one have a different resource for the detail I need to do this the first time? Thanks J |
08-20-2022, 11:05 PM | #2 | |
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Re: 1939 transmission questions
Quote:
Bill |
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08-20-2022, 11:29 PM | #3 |
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Re: 1939 transmission questions
It looks like the spring retainer that hold the shoes in place in the synchronizer has come loose. I do not know if you can get it back where it needs to be but that will have to be done. Other than that, it actually looks good.
My opinion, Chris W. |
08-21-2022, 12:11 AM | #4 |
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Re: 1939 transmission questions
Thanks Chris.
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08-21-2022, 12:17 AM | #5 |
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Re: 1939 transmission questions
Thanks, just bought one. Here’s the link for others interested. https://www.vanpeltsalesstore.com/L-...ook_p_499.html
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08-21-2022, 05:53 AM | #6 |
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Re: 1939 transmission questions
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X3 on Van Pelts book, the gear charts are crucial. Last edited by jack backer; 08-21-2022 at 06:00 AM. |
08-21-2022, 08:41 AM | #7 |
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Re: 1939 transmission questions
Actually, the very first of the new type 91A synchronizer assemblies had the three detent plates and the two spring rings to hold tension on those plates. They were later discontinued for the early type plates with detent balls and coil springs. They returned in 1949 in the 8M prefix synchonizer for the Mercury cars that obsoleted the early style synchonizer. I've not had a problem with those spring rings coming out of the hub. Once they are installed in the hub, they usually stay put unless the ring has been bent out of it's original shape. The blocker rings will keep them from being able to come out
The transmission in the photos looks to have decent gears in it. The blocker rings look like they are going pretty deep into the gear. There is likely a lot of wear on the taper faces. Since the main shaft is sort of hanging out the back all the parts on there are out of normal position. The cases are vulnerable to excessive wear on the thrust surfaces of the counter shaft cluster. The case can crack between the front counter shaft bore and the input bearing bore. The trans in question doesn't look too bad with what is visible in the photos but careful inspection of all parts will clear or break it's bill of health. Last edited by rotorwrench; 08-21-2022 at 06:58 PM. |
08-21-2022, 10:00 AM | #8 |
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Re: 1939 transmission questions
It's kinda hard to tell in the picture but the reverse idler looks a little rough.
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08-22-2022, 02:22 AM | #9 |
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Re: 1939 transmission questions
Van Pelts book is excellent and his advice over the phone is also good.
There is a lot to check to get one of these perfect but its all in the book. Another good source is Al Zannino in Hemet California from Al's Transmission Mechanix. (ATM) |
08-22-2022, 11:46 AM | #10 |
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Re: 1939 transmission questions
Is this a bolt in swap?
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08-22-2022, 01:06 PM | #11 |
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Re: 1939 transmission questions
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08-22-2022, 02:18 PM | #12 |
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Re: 1939 transmission questions
That clip sits inside a "lip" of the three synchro blocks. You might be able to get it back in using a small flat blade screw drive as you turn the input shaft. If not, it's got to come apart to reinstall.
If it was mine, I'd tear it down and check it over unless you know it was rebuilt right. It is a real pain to take a trans out once it's installed in a car. Either the motor or the rear needs to come out depending of the center crossmember. Follow Mac's book to the letter. Don't skimp or skip steps. Only way to check back lash is with a rear bearing retainer bolted in place. Go as tight to the spec as possible. Too loose, it will eventually start popping out of 2nd and the cluster wants to thrust upward. Mac makes shims to help get the clearances where they need to be. Do it once and do it right while it's out of the car. Good luck and report back. |
08-23-2022, 02:47 AM | #13 |
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Re: 1939 transmission questions
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08-23-2022, 02:50 AM | #14 |
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Re: 1939 transmission questions
Thank you all very much for the advice, tips, wisdom, etc here. Tomorrow should be fun. Jason
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