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'37 1/2 ton transmission
#1362352 Thu May 28 2020 01:05 AM
Joined: Oct 2019
Posts: 74
'
Wrench Fetcher
I got the new seals in the differential and got that all back together so now it's back to the transmission.
PO brazed a spot on the rear of the transmission but it's still leaking. It was a lumpy mess so I ground it down flat with the case and it appears
there is something like a frost plug there. Is that what it is? Should I drill it out and put new frost plug in?. I can't find any reference to
it in the shop manual.
Thanks
John

Re: '37 1/2 ton transmission
'37 barn find #1362637 Fri May 29 2020 07:25 PM
Joined: Mar 2002
Posts: 9,050
Master Gabster
There are two shifter shafts that installed through holes in the rear and front of the transmission. It is possible for a leak to occur at one of more of these spots.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: '37 1/2 ton transmission
'37 barn find #1362643 Fri May 29 2020 08:28 PM
Joined: Apr 2007
Posts: 805
L
Shop Shark
If the area you are referring to is lower down and below the shift tower, it could be the end of the idler shaft. That can also leak, similar to what Truckernix mentioned above. There are no frost plugs, do not drill it out. If you want to fix it you may have to remove the tranny and at least partially disassemble. The ends of the idler shaft, and the ends of the shift rails can be coated with permatex and that will help a bit.
Kent

Last edited by Lightholder's Dad; Fri May 29 2020 08:31 PM.

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Re: '37 1/2 ton transmission
Lightholder's Dad #1362757 Sat May 30 2020 03:49 PM
Joined: Oct 2019
Posts: 74
'
Wrench Fetcher
OK, thanks.
Good thing I asked before I started drilling.
I wonder if I could put a layer of JB Weld or permatex on the outside?

Re: '37 1/2 ton transmission
'37 barn find #1362780 Sat May 30 2020 06:17 PM
Joined: Mar 2002
Posts: 9,050
Master Gabster
You will need to clean it well first. I would think JB Weld or RTV would work. Personally I wouldn't use JB Weld because if you need to disassemble it, that hole is used to drive out the shaft.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: '37 1/2 ton transmission
'37 barn find #1363048 Mon Jun 01 2020 04:26 PM
Joined: Mar 2019
Posts: 64
T
Wrench Fetcher
I would check for a crack in the case in that area.

The idler shaft is a light interference fit in that hole. Unless the shaft or hole or both damaged it should adequately seal unless the case is cracked.

If the hole is damaged you could have it bored oversize and insert a sleeve.


Rusty
Re: '37 1/2 ton transmission
'37 barn find #1363267 Tue Jun 02 2020 11:13 PM
Joined: Mar 2002
Posts: 9,050
Master Gabster
I wonder if a crack is the reason someone brazed it.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: '37 1/2 ton transmission
'37 barn find #1363345 Wed Jun 03 2020 03:12 PM
Joined: Mar 2019
Posts: 1,137
G
Shop Shark
Pics might help.


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