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01-11-2022, 04:30 PM
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#1 |
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Senior Member
Join Date: May 2010
Location: Hancock, New Hampshire
Posts: 375
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Pulling the transmission…
The '39 transmission in my '37 pickup is coming out for a rebuild. The early style synchromesh has quit and it pops out of second gear. None of that is a concern since I have Mac Van Pelt's book and catalog and I enjoy doing this sort of work. BUT when I pulled the rear axle/torque tube back to make room to remove the transmission, I saw the speedometer gear looking at me at the front end of the bell on the end of the torque tube. When I spun a wheel, the driveshaft didn’t move until I pushed it back rearwards and it reconnected. Mu guess is the driveshaft pin fell out or was never put in. Another factor has been a clunk when I change from forward to reverse or vice versa. I was hoping it was the universal joint but now I think it’s the driveshaft at the differential. So, long story but what does this sound like? With the rear end loose I'll pull it all the way out, remove the torque tube and see what’s up. I hope I don’t have to get into the pumpkin but it is winter and the shop is warm. Thanks for any suggestions.
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01-11-2022, 04:56 PM
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#2 | |
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Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,115
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Re: Pulling the transmission…
Quote:
Preliminarilly, I believe that is a good course of action to find out what's what! DD . |
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01-12-2022, 09:58 AM
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#3 |
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Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,440
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Re: Pulling the transmission…
A clunk indicates backlash or play. Reverse has an extra gear in play so that adds backlash. The rear axle can turn without rotation of the drive shaft through differential action. If you suspect problems, now would be the time to check the U-joint and pinion backlash.
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01-12-2022, 10:32 AM
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#4 |
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Senior Member
Join Date: Feb 2021
Location: Perry Mo.
Posts: 486
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Re: Pulling the transmission…
My gut feeling is a lose pinion nut . This (could) account for the sheared pin in the shaft coupling and the clunk when changing rotation direction . Still your thoughts on taking the tube off will tell the story best. Post some photos when you do. Tim
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02-03-2022, 05:49 PM
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#5 |
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Senior Member
Join Date: May 2010
Location: Hancock, New Hampshire
Posts: 375
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Re: Pulling the transmission…
Update: I pulled the rear end out from under the '37 pickup this afternoon to figure out why I've heard a big clunk when moving from forward to reverse or vice versa. As you'll see from the pictures the driveshaft was disconnected and able to be pulled forward while the torque tube was connected. Once I got the torque tube separated from the differential it was easy to see that the forward coupling pin had sheared. It was pretty clear that this had been the condition for many years because when you look at the driveshaft and coupling splines, they are almost worn away. Compare that to the rear splines on the coupling where it attached to the input shaft at the pumpkin. Those splines are like new. When I fit a Mitchell in my '40 sedan two years ago, i saved the driveshaft and will install it in the torque tube for the truck. Sometimes you get lucky,
Last edited by HDowse; 02-03-2022 at 06:51 PM. Reason: Added Update |
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02-03-2022, 06:51 PM
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#6 |
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Senior Member
Join Date: Jan 2011
Location: sw minnesota
Posts: 4,578
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Re: Pulling the transmission…
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02-04-2022, 06:33 AM
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#7 |
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Senior Member
Join Date: Jun 2013
Location: Marana Arizona
Posts: 1,776
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Re: Pulling the transmission…
Glad you found the issue. Time to put that order in with Mac. Keep us posted. Chap
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02-04-2022, 08:08 AM
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#8 | |
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Senior Member
Join Date: May 2010
Location: NJ
Posts: 6,182
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Re: Pulling the transmission…
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02-21-2022, 03:52 PM
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#9 |
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Senior Member
Join Date: May 2010
Location: Hancock, New Hampshire
Posts: 375
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Re: Pulling the transmission…
The driveshaft and transmission are back in and survived a test run in today's warm (for NH) weather. No clunks, synchros work unless I try to speed shift and why would I do that? A successful venture that took about 6 weeks. Thanks for the help fellow 'barners.
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02-21-2022, 04:13 PM
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#10 |
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Senior Member
Join Date: Jan 2011
Location: sw minnesota
Posts: 4,578
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Re: Pulling the transmission…
Good news ! thanks for reporting back
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02-21-2022, 09:33 PM
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#11 | |
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Senior Member
Join Date: May 2010
Location: Garlic Country of CA
Posts: 537
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Re: Pulling the transmission…
Quote:
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02-21-2022, 09:51 PM
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#12 |
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Senior Member
Join Date: May 2010
Location: Above the gnat line in Georgia
Posts: 7,009
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Re: Pulling the transmission…
6 weeks. Sounds like you work at about my speed. LOL
__________________
Life is like a roll of toilet paper. The closer to the end, the faster it goes. It is better to be seen, than viewed. "We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm". |
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02-21-2022, 10:04 PM
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#13 |
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Senior Member
Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,646
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Re: Pulling the transmission…
As I remember my wild and crazy youth, the synchro doesn’t even come into play during a speed shift, nor does the clutch. Just the timing of the shift with a momentary jiggle of the gas pedal. A shortened shift lever with a heavy brass shift knob is your friend here, but having a spare tranny ready to go is not a bad idea either.
__________________
Alan |
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