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Canadian Poncho Homepage -> Canadian Poncho -> Beaumont Power Train Tech Forum -> 12 bolt posi
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65 SD L79


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12 bolt posi
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ok, I have used up my good units and now what i have left will need parts to rebuild them. Should I just buy a new unit or is the GM one better?



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seventy2plus2


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I have an empty 4 series carrier on the shelf if that's of any interest.

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70 2+2 convertible
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70 Parisienne hardtop

 

 
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CdnGMfan


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Auburn for the Positraction unit, U.S. Gear for the Ring & Pinion if you can't find a GM part. That is what I have heard.
The Auburn is rebuild-able, while others like the True Trac are not.

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67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.

In garage, 296 cid inline six & TH350...

Cam, Toronto.


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65 SD L79


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Thanx Clint , I am gona have a better look on the shelves tomorrow 



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65 SD L79


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CdnGMfan wrote:

Auburn for the Positraction unit, U.S. Gear for the Ring & Pinion if you can't find a GM part. That is what I have heard.
The Auburn is rebuild-able, while others like the True Trac are not.

 Good info, I do have a number of 3.31 gear sets on the shelf 



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SGS Welding


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Not sure if you want the aggressive Detroit Locker

but I LOVE mine!

If you decide to go this way check your lug nuts often! It will shake them loose!



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67 Parisienne Convertible 

67 Parisienne 2 Door Hardtop 
DonSSDD


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Eaton posis have a good name.

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
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cdnpont


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I have a Eaton Posi in my 67. Still puts down two perfectly even stripes, and never chatters in turns. Carbon clutches.

Always rebuildable if needed.



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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
oshawacliff


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cdnpont wrote:

I have a Eaton Posi in my 67. Still puts down two perfectly even stripes, and never chatters in turns. Carbon clutches.

Always rebuildable if needed.

 I have witnessed those strips while being securely strapped in! 



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Like the larger type for my eyes. 

 

 
65 SD L79


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where would i find Eaton rebuild parts for sale?



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cdnpont


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Eaton. GM, Yukon?

As far as I know, the internals are all common to the 8.875" Passenger car posi.

Eaton adds some different carbon clutch discs and perhaps a different rate in the preload spring pack, but I believe it's all the same design.

 

Eaton Service Kit contents,

199554-010 is the 8.875" passenger car 3 series,

https://www.eaton.com/content/dam/eaton/products/differentials-traction-control/eaton-posi/eaton-posi-service-kits.pdf



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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
4SPEED427


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I know the parts books list different pieces for the real early 12 bolts. It seems to me that the 66 and up 12 bolts are all the same though. I'm talking car diffs, no idea about the truck 12 bolts.



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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65 SD L79


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this is an original 3 series GM that blew up. slit the spider gears and tore up the spring pack. The carier its self looks good. its where its better to replace the parts or buy a new complete unit



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cdnpont


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I added it all up,

 cl.JPG

Summit,

Carbon Disc kit   29426-00S  $311 Cdn

Described as 8.2/8.5" but the 8.875 is the same disc.

Gear service kit  29412-00S  $473

Preload kit 400# 29590-00S  $101

Choose 200, 400 or 800# pressure

                                                                $885 Cdn 

 

Eaton posi unit, 8.875, 3 series 19554-010  $948 Cdn

 

 

Last time I bought one it was $598 Cdn! But I'd still be inclined to buy a new unit Kevin,

 

 



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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
65 SD L79


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6E6D0E4B-D70A-4C2E-8735-4B865DBD2A97.png



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seventy2plus2


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65 SD L79 wrote:

where would i find Eaton rebuild parts for sale?

Tom's Differentials in Idaho will have everything you need.

https://tomsdifferentials.com/

 

 



-- Edited by seventy2plus2 on Wednesday 20th of March 2024 08:59:03 AM

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70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
65 SD L79


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3F5D771D-3A92-4A7B-AFD6-39118F8A8798.jpeg

F20216CB-A735-414B-9D8C-08376C61FD26.jpeg

F92B3EE1-B60A-4F25-BDD6-301E4F8C2108.jpeg



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seventy2plus2


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Looks like a 3 series to me that had a bit of an accident.

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70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
65 SD L79


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digging through the garage i found a total of 2 - 2 series and 3 - 3 series carrier posi. none of them would be worthy of just sticking in the way they are so a new one is on the way. I also have a few B body complete rears with posi in them but i will leave them together.



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cdnpont


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You get what you pay for. 



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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
CdnGMfan


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Ack! I said Auburn when I meant Eaton. Auburns are not rebuildable, the Eaton units are.

Sorry for the wrong info. Time to do some dusting, inside my head.



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67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.

In garage, 296 cid inline six & TH350...

Cam, Toronto.


I don't judge a man by how far he's fallen, but by how far back he bounces - Patton
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