M20 Slip Yoke repair or replace

[Bill L.]

Should I have my grooved slip yoke stainless steel sleeved or should I just replace it?

Looks like originals were discontinued a while ago.

Any recommendation on whose replacement to go with if replaced?

Should I have the slip yoke and drive shaft re-balanced?

Thanks,


Bill

[William C.]

Re: M20 Slip Yoke repair or replace

First answer the question what caused the grooving? Likely you need a new trans rear bushing and changeover of the gear lube. Otherwise you will just repeat the problem

[Bill L.]

Re: M20 Slip Yoke repair or replace

First answer the question what caused the grooving? Likely you need a new trans rear bushing and changeover of the gear lube. Otherwise you will just repeat the problem

Agree. I am going through the trans now. I am planning on replacing the rear bushing and rear seal along with side cover gasket, and shift lever o rings.

Trans has 115k miles so I expected wear. Trans leaked but shifted okay. Still may decide to do a complete rebuild given the mileage. Just need to find a shop that actually does the work in house that is reputable and reasonable in MD or No. VA.

Thanks,


Bill

[Joe L.]

Re: M20 Slip Yoke repair or replace

Should I have my grooved slip yoke stainless steel sleeved or should I just replace it?

Looks like originals were discontinued a while ago.

Any recommendation on whose replacement to go with if replaced?

Should I have the slip yoke and drive shaft re-balanced?

Thanks,


Bill

Bill------

As I recall, the sleeving operation for these yokes involves machining down the shaft of the yoke and pressing on the sleeve. I don't know of any "thin wall" type of sleeve for this application (i.e. like the sleeves used for harmonic balancer repair). I would NEVER use a sleeve that involved machining down the yoke shaft. That will seriously weaken the yoke and that will not be restored by the sleeve. The only thing the sleeve restores is the wear surface.

[Gary R.]

Re: M20 Slip Yoke repair or replace

What I did 30 years ago with my '69's slip yoke was to have it slightly turned and then spray welded. Final turning back to the original size. I has out performed my expectations, it sill as good today as it did 30 years ago. This was once a common practice with electric motor shops but many of them are closed now but it might be worth a try to see if there is a shop near you. I traded the guy 2 1/4 carbide tool bits and we were both happy.

[Bill L.]

Re: M20 Slip Yoke repair or replace

What I did 30 years ago with my '69's slip yoke was to have it slightly turned and then spray welded. Final turning back to the original size. I has out performed my expectations, it sill as good today as it did 30 years ago. This was once a common practice with electric motor shops but many of them are closed now but it might be worth a try to see if there is a shop near you. I traded the guy 2 1/4 carbide tool bits and we were both happy.

Hmm-Interesting idea. I bet I may find an old time electric motor shop in Baltimore. What is the OD of the yoke supposed to be when new?

Thanks, Bill

[Timothy B.]

Re: M20 Slip Yoke repair or replace

Bill,

Alban Tractor is a Caterpillar dealer and has/had a huge machine shop on Citation drive on the east side of Baltimore and they spray welded and machined a center pin on a Gradall for me years ago. The work turned out great so you may try to contact them to see if they would even do this for you.

Why don't you call Larry Fisher as he overhauls Muncie transmission and he may have a nice used part or what about Paragon for a reproduction part?

[Gary R.]

Re: M20 Slip Yoke repair or replace

Hmm-Interesting idea. I bet I may find an old time electric motor shop in Baltimore. What is the OD of the yoke supposed to be when new?Thanks, Bill

Hi Bill,Off hand I don't know the OD, but there should be enough good section to mic and see.

[John G.]

Re: M20 Slip Yoke repair or replace

I had the same groove wear problem with the original slip yoke on my '64. A local machine shop said they could do the spray weld thing, then turn to size. The price quoted was around $250, which I felt was a bit high. I ended up purchasing a repro slip yoke from America's Finest Corvettes for about a hundred bucks less. I was told that the rockwell hardness of the repro slip yoke was much harder than the original factory slip yoke. The Muncie was rebuilt, new rear bushing included.

[Domenic T.]

Re: M20 Slip Yoke repair or replace

I had one spray welded & ground back to size by a shop a friend deals with.
They didn't charge my friend because he sends them a lot of work which tells me it shouldn't be that expensive.

Dom

[Gary R.]

Re: M20 Slip Yoke repair or replace

The last one I had done was about 8 years ago and cost $50 but I had to turn it to size. This was done by a factory instead of a small shop where more attention usually will be paid to the job. $250 is way out of line, I agree for that I would use a new aftermarket but I bet it won't be as durable as the yoke I had welded 30 years ago. Finding a shop is the problem, up here most are gone. I do know where that welding setup went to though but it's sitting in a corner of a small shop unused now.

[Domenic T.]

Re: M20 Slip Yoke repair or replace

Gary,
What about a shop that does hard chroming such as they do on aircraft struts? I think that's what was done to the yoke I sent in.

DOM

[Gary R.]

Re: M20 Slip Yoke repair or replace

Hey DomNever tried that, cost would probably prohibit it. As mentioned when I had my 69's done it was the price of 2 tool bits!

[Domenic T.]

Re: M20 Slip Yoke repair or replace

Gary,
Now that you mention tool bits, hard chrome might be what the shop did to my yoke because it was surface ground. I have 2 more to send out some day but I think they only do work for a large factory. There is a hard chrome shop about 20 miles west that I might contact when I find out where they are located.

DOM

[Dick W.]

Re: M20 Slip Yoke repair or replace

Check out CR 480150. It is listed as manual transmission sleeve repair kit. Should be under $50.00 retail at your local auto parts