Transmission info.

[Brian T]

I am rebuilding a 3 speed transmission for my AA truck, I have salvaged a good gear set from 1 of three transmissions that I found , 2 of the housings are the later type (29) the end play in the cluster gear was around 021”, with some scoring in the housing.
My question is should this scoring be fixed, or will a shim JB welded to the thrust face work?, there doesn’t seem to be any hard and fast rules as to how much play is to much, factory recommends 003” to 005”.
The other housing is a (28) with the thrust washers, I did not check the end play upon dismantling, I do have new washers coming for it along with the (MNPL) as per Tom Endy, your input would be very helpful.
Brian T.

 

[aaron griffey]

I would NOT try JB or any other epoxy inside the transmission.
I would get a machinest to make a shim that would get the play back to .003"
Better to go with the '28 housing, even if it has .010 play.
A favorite lube in old sliding gear cases is: mix 5 lbs. of 140 gear oil with a can of long fiber wheel bearing grease and a can of STP.
It must be mixed with a double vane beater for several minutes.
In freezing weather areas I'd use 75-140 gear oil.
Good luck and let us know how it turns out.

 

[Purdy Swoft]

If you must use the housing with the scoring and end play it could be shimmed and there would be no need to use the JB weld, not that JB would hurt anything but the shim could be free floating. I would probabably replace the transmission case. They are not hard to find. Call Berts in Denver, Tuesday thru Friday 800-321-1931

 

[Brian T]

I ended up using the late case, it wasn’t scored like I thought, it just had the wear groove from the cluster gear, {the one I am using came from this case}

I assembled it in to the groove with the bearings and installed two .010” king pin shims at the other end, and ended up with .002” clearance measured with a dial indicator, I then spent some time sanding down one of the shims with a palm sander, and ended up with .004”.

I also have a question regarding main shaft end float, which is .019”, the bearing moving back and fourth between the snap ring and the rear retainer, would this cause a problem ?, I may on final assembly add some metal adhesive to lock it in place.

This is in reply as to how it came out, thank you both for your input.
Brian.

 

[skip]

Is that plate on this side for a PTO?

skip.

 

[Brian T]

Hello Skip,
Yes it is , but only for a 4 speed double A, the 3 speed in the double A doesn’t have that cover plate , so the PTO is mounted on the duel high gearbox, if somebody finds a PTO with 4 mounting bolts , (not six) then post it on FMAATC , as a member as been looking for some time now.

 

[Fred]

BRIAN, Please check your P/M BOX..