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Old 09-04-2019, 08:18 PM   #1
Pete F.
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Default Trany Problems

So my transmission has been fine all summer. Yesterday I started the car went to take it out of third and the shifter was locked in third.
Today I took the top off to find that the synchro hub had travelled to far and the balls came out.
Anybody have any ideas , the hub seems to have about 3/16 for and aft play


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Old 09-04-2019, 08:28 PM   #2
petehoovie
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Default Re: Trany Problems

What year tranny?
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Old 09-04-2019, 08:42 PM   #3
Pete F.
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Default Re: Trany Problems

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What year tranny?


Well it was supposed to be a 39 but some say it a 37.
I really donít know


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Old 09-04-2019, 08:44 PM   #4
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Default Re: Trany Problems

See > http://www.vanpeltsales.com/FH_web/F...-52-LD3spd.jpg


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"We shot our way out of that town for a dollar's worth of steel holes." - from 'The Wild Bunch' - 1969
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Old 09-04-2019, 08:50 PM   #5
Pete F.
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Default Re: Trany Problems

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Ok
Mine looks like 48-7124 Iím trying to figure how much play is expectable


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Old 09-04-2019, 08:51 PM   #6
skidmarks
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Default Re: Trany Problems

That style synchro is a 37 to early 39.
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Old 09-04-2019, 08:52 PM   #7
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Default Re: Trany Problems

My guess is the bolt holding the universal joint on the output shaft is loose allowing excessive end play in the output shaft and the synchro hub moved too far rearward when you last shifted into second gear. You will have to remove the synchro parts to reassemble it. I have never tried to do that with the trans in the car. I think you will have to remove trans to repair it.
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Old 09-04-2019, 08:54 PM   #8
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Default Re: Trany Problems

Check to see if Part #7069 -Spacer Washer- is present....
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"We shot our way out of that town for a dollar's worth of steel holes." - from 'The Wild Bunch' - 1969
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Old 09-04-2019, 08:55 PM   #9
Pete F.
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Default Re: Trany Problems

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Originally Posted by Zeke3 View Post
My guess is the bolt holding the universal joint on the output shaft is loose allowing excessive end play in the output shaft and the synchro hub moved too far rearward when you last shifted into second gear. You will have to remove the synchro parts to reassemble it. I have never tried to do that with the trans in the car. I think you will have to remove trans to repair it.


Wow thatís not what I wanted to do at the end of the season but it looks like Iím going to do that thanks


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Old 09-05-2019, 07:02 AM   #10
Terry,OH
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Default Re: Trany Problems

That syncro hub is supposed to move back and forth on the main shaft smoothly. If it did not and it stuck toward the 2nd gear then when shifted into 3rd the sleeve could uncover the syncro balls allowing them to fall out. From your photo it shows the hub is too far rearward (toward 2nd gear). The hub you have has the brass syncro rings built in to the hub. They are not visible unless the transmission is disassembled.
The hub is the central part of the syncro on the main shaft 7105, the syncro sleeve is the outer part that covers the balls 7106.

Last edited by Terry,OH; 09-05-2019 at 06:20 PM.
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Old 09-05-2019, 07:22 AM   #11
Tim Ayers
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Default Re: Trany Problems

Could be a bunch of stuff, but something is out of spec allowing the hub to slide too far forward.

Give Mac VanPelt a call. He strongly recommended going to the "block" style of detents on the hub instead of the balls. They prevent this from happening.

While your in there, replace your brass synchros rings. The one you can see in the picture is shot.

If you don't already have it, I recommend purchasing his transmission book.
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Old 09-05-2019, 05:15 PM   #12
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Default Re: Trany Problems

Vanpelt's website and contact information > http://www.vanpeltsales.com/


Tel. 1-513-724-9486


emai > sales@vanpeltsales.com

Office Hours:
Monday - Thursday (9:00am to 5:00pm Eastern Time)
Closed Friday through Sunday


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"We shot our way out of that town for a dollar's worth of steel holes." - from 'The Wild Bunch' - 1969
https://www.youtube.com/watch?v=7NReUd2_0u0

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Old 09-06-2019, 11:54 AM   #13
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Default Re: Trany Problems

I'm rebuilding same style transmission.

That early Syncro whill have to come out, get new ball and spring kit, piston ring compressor and a BFH to get it back together.

But since you have to take the trans out and take it down that far might as well as refresh everything while your in there.
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Old 09-06-2019, 02:00 PM   #14
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Default Re: Trany Problems

There is a sleve KR Wilson #BV39 which is to slide the balls down when assembling I belive.. I just went to shop and looked at the one I have. Had it so long for.got and have not done a trwanny for many years -- teen age years !! At 83 memory is not my strong point at this stage of life.
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Old 09-06-2019, 04:31 PM   #15
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Default Re: Trany Problems

Is it possible that the selector fork has travelled to far for top gear ,there are stops built into the gear box top and the spring loaded balls 7233 that lock into the 7241 on Petes illustration
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Old 09-06-2019, 06:05 PM   #16
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Default Re: Trany Problems

Quote:
Originally Posted by FlatheadTed View Post
Is it possible that the selector fork has travelled to far for top gear ,there are stops built into the gear box top and the spring loaded balls 7233 that lock into the 7241 on Petes illustration
That was my first thought, they look like the detent balls to the shift levers.
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Old 09-06-2019, 07:40 PM   #17
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Default Re: Trany Problems

Some times thats the problem ,I have a trans in my shop that has some flat washers over the selector shaft to limit the selector fork travel,
A band ade fix
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Old 09-07-2019, 12:14 AM   #18
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Default Re: Trany Problems

My guess is the synchro wore out . . . allowing the collar to travel too far. I had that happen on a 39 Box (with the late style synchros). The car was stuck in 3rd gear.
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Old 09-07-2019, 07:03 AM   #19
Terry,OH
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Default Re: Trany Problems

Anyone have the link to the posting a couple of months ago?? Fellow had the same problem lots of photos and link to his posting on the HAMB. I have searched without luck.
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Old 09-08-2019, 07:06 AM   #20
chap52
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Default Re: Trany Problems

Well, you going to have to pull the transmission and while it's out think of it as an "opportunity" to R&R everything along the way. How's the U-joint? Better to change it out now rather than later. Our "hobby" is always a can of worms that eats dollar bills.
Enjoy the adventure... Chap
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