The Stovebolt Site Forums The Shop Area Driveline '37 1/2 ton transmission

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

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.

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

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?

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.

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.

I wonder if a crack is the reason someone brazed it.

Pics might help.