Rear Yoke Clearance

[Bob U.]

What is the clearance tolerance between the end of the Yoke and the Pin in a 76 Differential. I remember seeing it once, but can't find it now. Memory says it is not supposed to be more than .030".

Any help would be appreciated,

[Joe L.]

Re: Rear Yoke Clearance

What is the clearance tolerance between the end of the Yoke and the Pin in a 76 Differential. I remember seeing it once, but can't find it now. Memory says it is not supposed to be more than .030".

Any help would be appreciated,

Bob-----

There is no GM spec on it. However, I usually only recommend about 1/16". 0.030" would be at the absolute limit of what I'd consider acceptable. From that point, wear will accelerate rapidly.

[Bob U.]

Re: Rear Yoke Clearance

Thanks Joe, I am going to replace one that has about .055" clearance.

[Joe L.]

Re: Rear Yoke Clearance

Thanks Joe, I am going to replace one that has about .055" clearance.

Bob-----


One correction to what I wrote previously. The maximum that I recommend is about 1/16" (or, 0.0625). So, 0.030" is obviously not the "absolute maximum" of what I'd recommend; it's about half that. I don't know what I was thinking when I wrote that----I must have been sleepy.

Anyway, you're going to be very surprised when you see what the end of the axle with 0.055" clearance looks like when you remove it.

[Bob U.]

Re: Rear Yoke Clearance

Joe:

At first I thought I had a lot more than the .055", when I took it apart I found the snap ring for the side with all the movement stuck in one of the Posi springs . I had to 'help' the yoke out of the cage because the end was mushroomed. After cleaning off the mushroom and using a new snap ring, I checked clearance and got the .055". I was going to replace the yoke anyway but then couldn't find the max tolerance to check the other side. I know I have read it somewhere, but couldn't find it again.

Thanks for your input. You certainly are a great resource for everyone!

Bob

[Joe L.]

Re: Rear Yoke Clearance

Joe:

At first I thought I had a lot more than the .055", when I took it apart I found the snap ring for the side with all the movement stuck in one of the Posi springs . I had to 'help' the yoke out of the cage because the end was mushroomed. After cleaning off the mushroom and using a new snap ring, I checked clearance and got the .055". I was going to replace the yoke anyway but then couldn't find the max tolerance to check the other side. I know I have read it somewhere, but couldn't find it again.

Thanks for your input. You certainly are a great resource for everyone!

Bob

Bob------

When you find a yoke axle "mushroomed", that automatically means excessive wear. When wear gets to manifesting itself in this way, the case hardening is worn through. Personally, I would NEVER re-use such an axle, even after removing the "mushrooming".