Pinion Bearing Replacement

[dobie]

A few years ago while my RR was getting the motor work done, the shop owner said that in his opinion the pinion bearing was starting to go bad. His recommendation was to have me come back whenever I started to drive the car constantly. Well, i guess that time is finally here.

So, how expensive is this if I have a shop do it? I know nothing about this stuff, and Id feel better having it done right knowing that things are set up properly.

Any thoughts?

:cheers:

 

[sixgunrunner68]

He'll have to tear down the whole diff to change the pinion bearings then reset the drag, lash and pattern. You'd probably want to consider a complete bearing and seal kit while you're there. In any event I'd say about three hundred in labor give or take.

 

[69hemibeep]

:yeathat: Make sure he is equipped to do it or go to a differential shop.Do you know what case your 8 3/4 has? A 489 will have a crush sleeve that can be replaced with a spacer that Dr. Diff sells.

 

[dobie]

Ok. Thats what I was thinking too. In the end Im sure it'll be closer to $500 or so.

I dont know what case I have. Im not sure how to tell either.

 

[Roadcuda]

There should be a number cast in case. It's on the side of the pinion part of the case and IIRC it's on both sides.

 

[dobie]

OK. Thanks for the information. I'll have to look next time I'm underneath it.

 

[69hemibeep]

There should be a number cast in case. It's on the side of the pinion part of the case and IIRC it's on both sides.

a part number ending in 741, 742 or 489 the all have different pinion designs also

 

[dobie]

Great. I'm sure mine will be the most expensive.

Thanks.

 

[Roadcuda]

Here's what to look Steve.

http://www.forabodiesonly.com/mopar/att ... 1365958679

 

[dobie]

Thanks!

 

[dobie]

I got underneath her today, and mine is a 489 case.

So I just did a very quick web search, and it appears that the 489 case was introduced in 1969....So, it appears to be not original to my bird. It does seem though that the 489 case is slightly preferred, correct?

 

[sixgunrunner68]

It's arguable. The pinion is heavier duty in the 89 , some like the sure grip in the 42 better for easier service.

 

[dobie]

Ahh.... I see. So what do I have then in terms of the Sure Grip? I know there's a clutch and a cone type...??

 

[ACME A12]

Ahh.... I see. So what do I have then in terms of the Sure Grip? I know there's a clutch and a cone type...??

Should be the cone type.

It can be rebuilt despite a lot of what you will read that states that it cannot.

 

[69hemibeep]

Ahh.... I see. So what do I have then in terms of the Sure Grip? I know there's a clutch and a cone type...??

Should be the cone type.

It can be rebuilt despite a lot of what you will read that states that it cannot.

It takes a little machine work.

 

[dobie]

Thanks for the info guys.