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Canadian Poncho Homepage -> Canadian Poncho -> Beaumont Power Train Tech Forum -> 1969 Beaumont.. Need Posi Installed
Post Info TOPIC: 1969 Beaumont.. Need Posi Installed
4SPEED427


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1969 Beaumont.. Need Posi
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There actually is no factory 3.42 ratio in a 10 or 12 bolt like the Beaumont came with.

The choices would be 3.07, 3.31, 3.55 for 12 bolt diffs

The choices would be 3.08, 3.36, 3.55 for 10 bolt diffs

-- Edited by Carl Stevenson on Sunday 3rd of November 2013 03:44:09 PM

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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)
Beau 69


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1969 Beaumont.. Need Posi Installed
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Hi All;

New to site, lots of great info and expertise, intend to inquire about direction for my car in future.

Looking to install 3.42:1 Posi in my 69 Beaumont next spring 2014.

Have 3.08:1 Open diff 12 bolt, not a great mover........... I'm in Winnipeg. Anyone help with best purchase option?? 

 

Thanks



-- Edited by Beau 69 on Saturday 10th of May 2014 09:55:27 PM

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dcneric


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RE: 1969 Beaumont.. Need Posi
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Welcome to the site. Please feel free to share some pictures of your ride, good bad or ugly.

3.42:1 is available in the aftermarket. ie Richmond Gear offers a gear set.

Can't offer comment on posi units but will say that I was not overly impressed in a PowerTrax locker that I had in my 70 GTO. It worked awesome but snapped painfully loud on corners.

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Eric - Regina, SK

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1935 Chev 3 Window Std Coupe

1957 Chev 2dr 

1967 Mustang Convertible

1969 Firebird 350HO Convertible

1969 Camaro X11-V8

1969 2+2 was a 396

1969 2+2 427

1980 Harley FXWG

1982 Chevy Silverado

1986 CJ7 Jeep

 
4SPEED427


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As far as the posi unit goes, I think there's quite a selection of aftermarket units out there but I've heard guys say an Eaton unit is fine for the street. No experience with anything other than a stock unit myself though.

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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)
Beau 69


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I guess I'm going to start the junkyard route and then aftermarket.  I'm thinking 3.36:1 12 bolt would work well as well ,likely about 2800 RPM @70 MPH with TH350 and 29 " BFG T/A's

dcneric.......................you may have seen this car , it came from Regina

 

Les Duncan



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4SPEED427


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If it's a 12 bolt you will be shopping for 3.31 ratio Les. 3.36 would be 10 bolt. I know, picky picky but might as well have the right numbers if you are shopping!

I don't know how much junkyard success you will have. These things are just getting too old.

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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)
Beaumont4008


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Would it be this car by chance ?

 

 

img_9928.jpg



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Beau 69


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That's it..................... have had a few issues with timing and carburetion, bad heads, too much cam and low compression but I have plans to match components up a little better.

Rest of car is solid.

 

Les

 



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racer6929


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Les, I can recomend the Eaton posi unit, my '69's had the same unit for about 20 years now and the only problem's been remembering they need a shot of posi additive to the fluid every few years.
I'm running over 500 hp and ditto on torque, street strip and trailer hauling so you can be assured it's been tested.





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Glen.

Vernon B.C. CANADA !

1969 SD 396
bowtieboy


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No complaints about my eaton!!

I did blow up a lock right though before the eaton

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racer6929


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Ate an Auburn before the Eaton, non rebuildable !
Car was stock with an open rear end, 325 hp and if memory serves a rating of 425 ftlbs torque ?

Somebody wasn't thinking..got a ticket for a 1 tire fire same year got the car..



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Glen.

Vernon B.C. CANADA !

1969 SD 396
4SPEED427


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I was dealing with exactly this at work today. We have a truck in the shop with diff trouble, 98 with an 8.5". I called around and got prices on the Auburn and the Eaton. The Eaton was only about 75 bucks more than the Auburn and my experience with Auburn was through 90's B bodies. Those Auburns are almost always worn out on the Impala SS's by the time they have 50,000 miles on them, and as stated, non rebuildable. To me the Eaton vs. Auburn is a no brainer and what's posted above confirms it.

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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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427carl


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Beau 69 wrote:

I guess I'm going to start the junkyard route 

 

 

Les Duncan

          Buy new   and save the pain



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Beau 69


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Thanks to all for input............ Eaton is often mentioned as a factory supplier as well.

I'll see what I need for swap and install.......... should be able to unlock more than one tire.

L

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