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Post Info TOPIC: 69 BOP 8.2 posi swap


Poncho Master!

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69 BOP 8.2 posi swap


Our good friend JC2+2 is rebuilding my diff, putting in a Richmond posi with 3:55 gears.

Is there supposed to be a spacer for the ring gear to line everything up?



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I think so. If your carrier is a 2 series, you need a spacer.

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cranks38 wrote:

I think so. If your carrier is a 2 series, you need a spacer.


 I thought so as well. This diff was previously rebuilt and this was supposed to be a rebearing job. And only because water got in and pitted the bearings. Well it was set up with double shim thickness on the left side and almost no shims on the right side. And that was with.030 backlash. Spec is.010. I brought it in to .017 with hope it doesnt howl.  With the new axles bottomed in the carrier the left one sticks out 3/8 further. I dont have the original axles but lm guessing the left one was cut shorter to make things work. Does anyone know where to locate that ring gear spacer we need to set this diff up properly? Heres a few pictures. 



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I'm not really up on the BOP diffs but I found a spot online that shows the 3 carrier choices.

What are you changing, what ratio to what ratio?

If I read this chart right, if you are going from 2.76 to 3.55 you might actually be jumping up 2 carrier options? If that's the case, I would sure think it would have to have a spacer.

https://www.crawlpedia.com/thick_gears.htm



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Have you tried JB's?

Barring that, I know some car guys in the Edmonton area. I can ask on your behalf, if you like.

.



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4SPEED427 wrote:

I'm not really up on the BOP diffs but I found a spot online that shows the 3 carrier choices.

What are you changing, what ratio to what ratio?

If I read this chart right, if you are going from 2.76 to 3.55 you might actually be jumping up 2 carrier options? If that's the case, I would sure think it would have to have a spacer.

https://www.crawlpedia.com/thick_gears.htm


 Carl. It has 3.55 gears and was like that when Terry got it. It was put together carrier not matching the gears. Pretty sure its for hiway ratio. Im just trying to sort it all out and put it together properly. A spacer behind the ring gear should bring everything back in sink. 



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cranks38 wrote:

Have you tried JB's?

Barring that, I know some car guys in the Edmonton area. I can ask on your behalf, if you like.

.


 If you could ask that would be appreciated. Thanks. Next time we have coffee meet (not sure when that might be now) come out and Ill buy you coffee. Thanks 



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If I see it right though, there may be a thin spacer and a thicker spacer.

Thin would do 2.94 to 3.23 on the 2.76 carrier. Thick would do the 3.31 and up on the 2.76 carrier. Make sense?


This is what that site says for the 3 choices of carrier-

2.76 & Down 2.94 to 3.23 3.31 & Up

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Does the site give thickness of the spacer. Im thinking around 1/4. Ill check the link. Thanks

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Not that I saw but I didn't take a lot of time to read it, more just speed reading to see if I could find something that might shed some light.

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I think I found what I need. Looks to be the proper thickness as well. Now where with availability. 



-- Edited by JC2+2 on Monday 23rd of March 2020 05:28:51 PM

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'68 Parisienne 2+2 Convertible Matador Red (Resale Red but not for sale).



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I'm thinking give Ames Performance Engineering a call. They should be able to point you in the right direction.

Also, is there a casting # on the carrier? Somewhere I have the Chevy 12 bolt posi carrier casting #'s written down, and if you provide your casting # I'll do some research.

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Or try Tom's Differentials, they're in Ponderay ID, just outside Sandpoint. Tom is no longer with us, but I'm sure someone there can help you out.

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Again this site is a wealth of knowledge, thanks for the input

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Yeah just following this thread just makes me say Wow!  What a great bunch!



-- Edited by 66 Grande guy on Tuesday 24th of March 2020 01:04:24 PM

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ken from northern Alberta

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IMG_2533.jpgIMG_2532.jpgIMG_2526.jpgIMG_2525_01.jpgIMG_2524.jpgSo we got the spacer and there is a couple problems with it, there is no bevel on the inside edge like the ring gear, and the thickness varies.

Must have been made on a Fri afternoon

 



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68 custom
68 deluxe
67 custom
67 SD convertible (1 of 1)
16 Colorado 4x4 Duramax

Long live the Canadian arrowhead >

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Where'd you get it?

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Quick performance



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68 custom
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67 SD convertible (1 of 1)
16 Colorado 4x4 Duramax

Long live the Canadian arrowhead >

 Edmonton,AB

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