Rear transmission bushing fit?

[Jack P.]

How snug should the fit on the slip yoke be? My old one was snug, the replacement bushing could rock on the yoke. Are there two sizes ? I am use a new yoke , must be wrong bearing or Chinese not made to spec, it wS a Napa kit. Have orderd new kit from summit. Will get today. I did see on e-bay a large or small bushing being offered.?

jack

[Jack H.]

Re: Rear transmission bushing fit?

The 60's transmissions used a smaller yoke, and the 70's were larger. However, the differences are very significant. Night and day. I doubt that's the issue you are seeing. Most rebuild kits include both the older and newer style bushings, but the newer bushing wouldn't even come close to fitting into an older tail housing.

[Jack P.]

Re: Rear transmission bushing fit?

Did not put it in housing as it was too loose on new yoke!

[Bob R.]

Re: Rear transmission bushing fit?

It should be a snug fit or you will notice a leak. Check the new yoke against the original one and make sure that isn't the problem.

[Jack P.]

Re: Rear transmission bushing fit?

The new bushing is big on both yokes, the old bearing is snug on both yokes. It seems that my builder used a clevite 02207 bushing which is smaller then the standard one that comes with kits. I just tried a second bushing from summit and it is big on both yokes compared to my old bushing?
I may put the old one back
jack

[Joe L.]

Re: Rear transmission bushing fit?

How snug should the fit on the slip yoke be? My old one was snug, the replacement bushing could rock on the yoke. Are there two sizes ? I am use a new yoke , must be wrong bearing or Chinese not made to spec, it wS a Napa kit. Have orderd new kit from summit. Will get today. I did see on e-bay a large or small bushing being offered.?

jack

jack-------



Use a GM #6260048. If that does not fit perfectly, then you've got some other problem.

[Jack P.]

Re: Rear transmission bushing fit?

jack-------



Use a GM #6260048. If that does not fit perfectly, then you've got some other problem.

Hi Joe,

"fit perfectly" that is what my question was. How snug, Should the bearing , when I slide it on the yoke , be able to "rock" " feeling too big, not tight enough"

The 02270 , when I slide it on the new or old yoke fits just right. It will slide on smooth, but has no movement if you try to rock it

The Clevite 02270 bearing fits perfectly on my old and new yoke. ( from Paragon)

The two others I can spin the bearing with my finger , that is how much clearance there is. Was that the design? so the yoke can move if there is run out in the shaft?

The builder was a retired pro transmission guy, his son and brothers do transmissions even today. Did he use the 02270 because it was a better fit. I just bought two on ebay for $10. I will get them next week.

So my question , how tight or loose a fit, holding the bearing and yoke in my hand,

Thanks

jack

[Joe L.]

Re: Rear transmission bushing fit?

Hi Joe,

"fit perfectly" that is what my question was. How snug, Should the bearing , when I slide it on the yoke , be able to "rock" " feeling too big, not tight enough"

The 02270 , when I slide it on the new or old yoke fits just right. It will slide on smooth, but has no movement if you try to rock it

The Clevite 02270 bearing fits perfectly on my old and new yoke. ( from Paragon)

The two others I can spin the bearing with my finger , that is how much clearance there is. Was that the design? so the yoke can move if there is run out in the shaft?

The builder was a retired pro transmission guy, his son and brothers do transmissions even today. Did he use the 02270 because it was a better fit. I just bought two on ebay for $10. I will get them next week.

So my question , how tight or loose a fit, holding the bearing and yoke in my hand,

Thanks

jack

jack-------


"How snug" is an entirely imprecise and difficult to describe condition. The bushing should have an ID of 1.505". If it does, then the bushing is as it should be.

[Domenic T.]

Re: Rear transmission bushing fit?

Jack,
A bushing will get a tad bit tighter when pressed into it's place. My guess is about .004 on the munci.
When I machine thin bushings I plan on the shrinkage due to the squeeze.


Dom

[Jack P.]

Re: Rear transmission bushing fit?

Jack,
A bushing will get a tad bit tighter when pressed into it's place. My guess is about .004 on the munci.
When I machine thin bushings I plan on the shrinkage due to the squeeze.


Dom

Hi Dom,

I was wondering about that. Maybe the 02270 was that same fit before installation as the kit bushings, and now is "more snug" than the uncompressed bushings. I will have the new 02270 is a few days and will be able to compare both "new bushings".

Thanks

Jack

[Jack P.]

Re: Rear transmission bushing fit?

Hi Dom,

You were right. I just received the new Clevite 02270 and it fits loose just like the other new bearings. I put a mic on the old bearing, 1.5 and the new bearing is just a hair larger , 1.505 ish as I don't have a digital read out , but it was almost one line bigger. So the bearing does compress a bit. Enough for you to feel and see the difference once out .

While I have you on the line, what should I use to set the bearing. I had read about a 1 1/2 in PVC piece of pipe to drive it home. What do you suggest for me ?

Jack



I do want to drill the boss , so I can drain the tranny. Any suggestions , size of drill, plug ? how deep.....



I have the tool to remove the bearing while the tranny is in the car. If you would like to borrow it let me know and I will lend it to you.

[Jack P.]

Re: Rear transmission bushing fit?

Better picture, It was a very common tool years ago when these transmissions ruled the car world. Just remove seal, and compress tool as shown, side in and click on to bearing, turn bolt , and it pull out the bearing.



Compressing tool for easy fit on output shaft



Ratchet out bearing

[Domenic T.]

Re: Rear transmission bushing fit?

Jack,
Got tied up here in the shop and didn't get to the computer. I have a set of bushing sets and use my press to set the bushing. It fits inside and keeps the bushing ID from damage. Your PVC method should work.

Dom

[Domenic T.]

Re: Rear transmission bushing fit?

Jack,
It was late and for some reason I thought the tail housing was off. Yep, you will have to put the bushing in place with something like you described. It's been years since I did one with the out put shaft in place.
The lathe comes in handy for making a tool to drive the bushing home. I bought pipe and made tools to do what you are doing. I think the chevy dealer I worked for had the tool in the tool bin to do what you are doing with PVC.
You reminded me that I have only done complete overhauls for all these years. I had a few yokes metalized and turned down to size last year. They were worn and a friend took them to his shop and built the surface up and turned it down to size. He is out of business now but other hard chrome shops do the same. The yoke repair was less than the cost of a new one but trading services worked at the time. Your car did do well on your looooong trip. To bad about your differential, but I'm sure you enjoyed it all the good miles it served you.

Dom