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Post Info TOPIC: Removal and rebuild of the 8.875" 12 bolt.


Canadian Poncho Superstar!

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Removal and rebuild of the 8.875" 12 bolt.


 You won't need a shim. just drive it in proud (STICKING OUT) of the housing. did that on my last one. No issues.

 

 



-- Edited by cdnpont on Sunday 17th of January 2021 05:09:01 PM

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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


A Poncho Legend!

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Removal and rebuild of the 8.875


Sorry but I have no idea what the "proud of a housing" is. Never heard that term.

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



Canadian Poncho Superstar!

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RE: Removal and rebuild of the 8.875" 12 bolt.


Sticking out you bumpkin.



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


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So I was looking at the service manual last night, and I came across this:

50866398897_74211f3e17_z.jpg

50866298501_5296e83256_z.jpg

Strangely, the long seal appears to be "correct".

Looks like you've been doing it right Mark!



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A Poncho Legend!

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Removal and rebuild of the 8.875


Wow, nice find! That is interesting. It sure makes you wonder "why not just make it the right depth"?

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



Canadian Poncho Superstar!

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Removal and rebuild of the 8.875" 12 bolt.


That illustrates it perfect John. And yes, it's strange that it would appear this way in a manual. 

Was that from the 66 Chevrolet chassis manual?

You can see that the red one has the sealing lip flush with the base of the shell. Just like in the illustration. Whereas the blue one the lip is well above the base.

 

Perhaps someone with a untouched 12 bolt can look behind the yoke shield and see if indeed the original seal sits off the housing.

50835639763_e7d01f4852_z.jpg



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


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jduffett wrote:

So I was looking at the service manual last night, and I came across this:

50866398897_74211f3e17_z.jpg

50866298501_5296e83256_z.jpg

Strangely, the long seal appears to be "correct".

Looks like you've been doing it right Mark!


 Note that in Figure 90 the seal is bottomed out in the carrier, so it has to have a 1/8" gap.   They're basically saying not to continue pounding as it will only go in so far.



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cdnpont wrote:

 Was that from the 66 Chevrolet chassis manual?


 Yes, '66.

 

seventy2plus2 wrote:

 Note that in Figure 90 the seal is bottomed out in the carrier, so it has to have a 1/8" gap.   They're basically saying not to continue pounding as it will only go in so far.


Agreed, there is a shoulder, but looking at the housing I just got from Mark, the shoulder is very small, and might not even be flat. I measure ~2.800" for the seal bore, but my calipers don't reach deep enough to measure the bearing race bore. The shoulder is at ~.545". Given the radius on the nose of the seal, I wouldn't say that shoulder is very effective at stopping the seal from being pounded in too far!

50868671267_47df1b7445_b.jpg

 

4SPEED427 wrote:

 Wow, nice find! That is interesting. It sure makes you wonder "why not just make it the right depth"?


I'm sort of wondering whether the original idea was that the shoulder would provide a positive stop and the gap at the flange was intended for easy removal?

 



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Slight correction... My excerpts from the service manual above are actually from the Corvette section! In the "Chevrolet, Chevelle and Chevy II" section, there is no explicit cross-section nor measurement, but the instructions are:

50894476193_c11a183d26_b.jpg


I believe the basic intent is the same though (don't bottom the flange). There is a nice cross section at the front of the rear end at the front of the Rear Axle section:

50894476233_d525fb39be_b.jpg



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