Hey does anyone have a transmission input shaft drawing with specs that they would be willing to share ??
Looking for the specs on this shaft so that I can northern skillbilly repair a blown AB gear and shaft.
I was thinking speedchaser or methodical would have that but I don't see it in any of their posts. Since they don't come here anymore I may be out of luck.
CO

I have a good shaft in hand. Anything you want me to measure?

Basically I wanted a machinist drawing but I will settle for the measurement on the shaft where the AB bearing sits.
Length and diameter (inches please as I am old school).
Would also like the inside diameter of the AB gear (inches).
THX
CO

So the AB needle bearing is 25x31x17mm and there are two stacked together. These measurements coincide with what I've actually measured:

The shaft diameter at the AB measures 0.983" (24.97mm)
The inside diameter of the AB gear is 1.224" (31.09mm)
The length of the inside of the AB gear is 1.342" (34.08mm, about 2x of 17mm)

Hope this helps

I was also thinking. If you are machining parts here, I wonder if you can go with a slightly larger needle bearing? Maybe 24x32 or something? It might help with failures?

You read my mind.
The other issue I got with this transmission is that the AB has several busted teeth.
Many I can just buff up or grind a bit, but there are 3 teeth that are half missing so I'm gona re-weld them. The welding on the gear teeth will decide whether or not I'll continue with this repair.
THX for the info.
CO

Those gears are cast - Right?

If so - do you remember the knuckle repair Speed did. after welding the cast he placed it in sand so it would cool slowly.

viewtopic.php?p=38108

I don't know.
What I do know is that they're hard. So is the shaft. It appears that they chromed the shaft. I was trying to clean up the surface in the lathe last night an got down to soft metal but at the mid point the cutter didn't do so well. Might have to grind off the chrome and re-cut. But at this point I'm going to leave it all alone and concentrate on the gear welding. If the gear can't be fixed then it's all over.
My plan is to preheat it in my toaster oven, then weld, then let cool slow in the toast oven.
I might fail but so what. It won't be the first time and there is nothing to lose as this gearbox is junk as is.
CO

Yes the gears are cast.

https://www.youtube.com/watch?v=LQM8bzjG6Oo
CO

Hey if any of you guys got a reverse switch (the one on the transmission) can you post a few pics ??
This tranny didn't have one on it and I want to see what they look like on the part that goes inside the transmission.
CO

Made an attempt at repairing a tooth tonight with some 308 stainless rod.
Picked the worst tooth on the gear because figured if that one no work then no sense continuing.
Not sure what to think of it right now. If you look close at the pics you can see two inclusions. One on each side of the tooth. That's what I hate about stainless rod. This happens to me all the time when I use this rod.
CO

I couldn't find my good complete spare,only this molested one that someone's used as a trany plug.
It's simply just a plunger style that's activated by the FNR selection position.The centre plunger is just like a 1/8 rod.
This one has been ground down for whatever reason.
Most prob in an attempt to deactivate it?

Here is a picture of mine as a less ground down example

Thx Lanix -- bugeye59.
I didn't want to tear apart any of my three machines just to look at it.
Kind of suspected that but wasn't sure. The shaft must be O-ringed inside I guess.
Seems simple enough.
CO

On a side note here -- I was looking closer at my welding on the gear. Looked at it under the shop magnifying lens. The welding looks good actually. The inclusion was near the surface and not like a subterranean cavern LOL.
Honestly think at this point the AB gear and input shaft can be repaired.
Confidence is high.
CO

Well I welded up all the teeth that needed to be welded.
Some were not welded as they will be dressed with a grinder. If there is 90% of the tooth good then no sense in welding those right ??
Then started to repair them in my lathe/mill using a 5C spin index. Unfortunately you can't divide 360 by 23 even using my math skills. So fell back onto the old manual method ----- Do it by eye.
Everything going good until I couldn't tighten up the 5C and hold the work piece. WTF ??
Threw my hands up and surrendered like we did in WW2.
Just came in to have a coffee and go to bed.
CO

I know for sure Meth or Speed would fire my azzz.
But this is what happens when a guy don't have all the right equipment to do the job.
You just have to work with the stuff you got.
CO

https://youtu.be/YWaF_QhcxA0 Here's a good vid to learn from.

Yeah I thought about buying a set of gear cutters but there is a problem.
If you look at the AB gear you'll notice that the gears are very close together so there is no way you're gona get a 5DP or what ever cutter in there. No room. The factory must have cast it this way and then had special machines to dress the teeth. I'm just guessing of coarse but maybe a gear cutter does fit. Not sure. In that video the guy did an easy gear. I could order a set of cutters but I bet money they come from China and that's going to take a long time to get here. I ordered a bunch of buttons for the transmission clutch and they're coming from USA. Ordered them on April 13th and they're still not here. Tracking says delivery "around" May 11th. ONE MONTH DELIVERY FROM USA !!!!
CO

I like your desire to explore. What does that table say in the video?

What about turning down the broken gear, and replacing the entire gear with another.
I don't know much about the gears in this transmission, but even if you cant buy a gear with the correct teeth, with the right tools you should be able to make one.
then just bore out the new gear to press onto your turned down AB gear and pin, screw, or possibly weld it in place for extra security.

Yeah you are right -- there are many ways to do this job.
I could make a new gear and shrink fit it onto the AB hub but then I would have to buy cutters.
My plan here was to see if it could be done the skillbilly way.
I'm making ground but just have to "play" around a lot.
CO

It's kind of like the welded piston idea -- just want to know if it can be done.
CO

that's fair, just wanted to throw the idea out there. Have you tried looking for another gear online that you can just bore out? just curious, might be an easier fix