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Canadian Poncho Homepage -> Canadian Poncho -> Canadian Pontiac/Acadian/Beaumont Cars/Parts Wanted -> 1973-77 A body 8.5 posi rearend 3.08-3.42 wanted Winnipeg MB area
Post Info TOPIC: 1973-77 A body 8.5 posi rearend 3.08-3.42 wanted Winnipeg MB area
pontorquer


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1973-77 A body 8.5 posi rearend 3.08-3.42 wanted Winnipeg MB area
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Like the title says... I've been looking for 6 months, still no luck... I didn't think they were this hard to find, i'm willing to spend $300 for a good one if anybody knows of one, please let me know... I want to replace the 2.56 open rearend in my 75 GA ... Also wanted 1971-76 ... 15 X 7s honeycomb wheels. Thanks !

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rabbit64cs


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I have 4 rough 15 x 7 Honeycombs.....bare.. 2 of them need to see the rim shop for some straighten up. the polycast is good , still bonded.

offers...

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later...rog

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73SC


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I have been looking fro 6 years Pascal, I'm not looking crazy but I would love to get rid of my 2.73's. GTO's came with the 3.42 as standard in '73 and the 3.08's were optional on all other Pontiac A bodies but of course try to find one of those as well.

Good candidates are Cutlass Supremes since a good number of these came with 455 and posi, Safari wagons as well since the 400 was standard in them.


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Ray White, Toronto ON

Formerly - The one and only 1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Built January 10, 1993 - Bowling Green Kentucky 

 
rabbit64cs


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keep your eye out for 2 nd gen Z-28 and trans am. they have the 8.5 as well.

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later...rog

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67Poncho


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rabbit64cs wrote:

keep your eye out for 2 nd gen Z-28 and trans am. they have the 8.5 as well.


..... and Ventura's, Nova's, Omega's, Skylarks...............  "X" bodied cars. I installed 3:42 gears in my '75 Ventura that came out of a late '80's pick up.. But mine was the # carrier!

 



-- Edited by 67Poncho on Wednesday 3rd of November 2010 11:02:49 PM

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Vincent Jr.
4SPEED427


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I've got a whole 4.10 posi centre section if that interest you Pascal!

Of course, my son says it's not for sale because he thinks it would be cool in his LT1 Roadmaster!

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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)
73SC


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No trying to be contrary but Pascal 4.11's in your car would be ridiculous. I don't know what your gasoline budget is but man going from a 2.56 to a 4.11 ?  I am sure someone can figure out what RPM's you'd be turning at 60 mph but I bet it would be close to 4,000 or better.

Now in the Roadmonster it wouldn't be too bad with the overdrive, might be fun, might be the thing to do Carl!


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Ray White, Toronto ON

Formerly - The one and only 1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Built January 10, 1993 - Bowling Green Kentucky 

 
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Beaumont4008


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Plenty of trucks out there with the 8.5 diff.  If you can pick up the posi unit you could just swap into your open dif housing.

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694279


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HI    i have the rear end and the wheels  ,,,,mint wheels the rear end is out of a1975 grand am 308 posi



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65Camino


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Why not just buy a posi and gears? Sure it would be more money but you'd be driving it before you ever found an axle!!

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73SC


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694279 wrote:

 

HI    i have the rear end and the wheels  ,,,,mint wheels the rear end is out of a1975 grand am 308 posi

 


Georgetown eh, sent PM. biggrin

 



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Ray White, Toronto ON

Formerly - The one and only 1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Built January 10, 1993 - Bowling Green Kentucky 

 
pontorquer


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Thanks everyone ... I'm going to look at a 1973 Pontiac Grand Am parts car next week ... comes with the 455 and honeycombs, still unsure about the rearend it's got ...

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rabbit64cs


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put me on the list for a 3.08 series posi too.......

I'll most likely buy a powertrax when I get closer...

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later...rog

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73supreme


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Another car to look at for a direct fit is the 78-84 Olds 98 & 88. This rear end bolts right in to 73 - 77 A-bodies but I think most of them have 2.73 but you could always change the gear out. I just put one in my 73 Cutlass.

Leo

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pontorquer


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IMG_1537.JPGIMG_1538.JPGWell I bought the 1973 Grand Am parts car today...comes with the original rebuilt 455 that they left without spark plugs installed and no air cleaner over 2 years (you guessed it..the motor's seized now!) honeycomb wheels, a nice crackless nose and grilles, posi rearend... here are a couple pics. It must have been a beautiful car in its days silver with red cloth interior.

-- Edited by pontorquer on Wednesday 10th of November 2010 11:15:42 PM

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rabbit64cs


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cool car,, great find for you ! I am curious what gear ratio an original 455 car would have come with?

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later...rog

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I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!
4SPEED427


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pontorquer wrote:

IMG_1537.JPGIMG_1538.JPGWell I bought the 1973 Grand Am parts car today...comes with the original rebuilt 455 that they left without spark plugs installed and no air cleaner over 2 years (you guessed it..the motor's seized now!) honeycomb wheels, a nice crackless nose and grilles, posi rearend... here are a couple pics. It must have been a beautiful car in its days silver with red cloth interior.

-- Edited by pontorquer on Wednesday 10th of November 2010 11:15:42 PM


Identical twin to the one I bought in the 80's with the 455. Cool...

 



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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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65Camino


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pontorquer wrote(you guessed it..the motor's seized now!)

   Diesel fuel will do wonders!! Try it...



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pontorquer


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Hopefully it has 3.08 gears ? Carl, maybe it is your old car... used to be in Dauphin MB ? I will take the heads off and dump diesel, trany fluid, seafoam...whatever it takes to free it Lol ... Picking it up saturday am.

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pontorquer


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Got the car home yesterday...took the cover off the diff. to find a broken posi unit dam !!! The 455 torque monster destroyed it, the loose spider gears pin elongated the hole in the case real bad. LOL ! It has a nice set of 3.31 gears at least and they are still in good decent shape.

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4SPEED427


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pontorquer wrote:

Hopefully it has 3.08 gears ? Carl, maybe it is your old car... used to be in Dauphin MB ? I will take the heads off and dump diesel, trany fluid, seafoam...whatever it takes to free it Lol ... Picking it up saturday am.


No, mine got parted out near Altonadisbelief

 



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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)
76GLM


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Same colour combo as my '75 GA 4dr. I agree that in it's day this colour combo would have looked sharpe!!

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73SC


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rabbit64cs wrote:

cool car,, great find for you ! I am curious what gear ratio an original 455 car would have come with?


Reading from the chart on page 4 of the 1973 AMA Specifications Form, dated September 1972 for the Pontiac LeMans and Grand Am  the  455 V8 was rated at 250 HP with 370 lb. ft torque, Turbo Hydramatic was the only available transmission and the axle ratios are listed as 3.23 with 3.08 for A/C cars.

In terms orf other Grand Am ratios, the 400 4bbl was 3.42 with 3.23 for A/C, the 400 2bbl was 3.08 for both A/C and non A/C.


 



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Ray White, Toronto ON

Formerly - The one and only 1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Built January 10, 1993 - Bowling Green Kentucky 

 
pontorquer


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Maybe the gears got changed over the years...says 43 13 on the ring gear, makes it 3.31.

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pont427


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Recently parted out a 74 455 Trans Am with 3:08 posi rear end. Almost no pitting ( dont know why) very clean, ready to bolt in with all mounting hardware and torsion bar. Open to offers.

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