Your 39 look like a canadian one, if yes you should run (if I'm not wrong) on a close drive line. You may consider to swap with a slight modification with a PG 53-54 rear end. I know (not sure) they are not the same lenght, but it's easy to modify.

A PG 53-54 rear end is a 3.55 ratio, enough to run to 65 mph.

Fitz.

Thanks for the info 427carl. But i dont have a chevy rearend in my car. It is an open drive rearend. Does anyone know what other cars may have a rearend the same as mine but with different gears thast may be interchangeable? I am sure this can't just be a Canadian Pontiac rearend and nothing else at all???

those give a good idea    

sorta looks like the old  rears that the racers used up into the 50-60's    

maybe a rear end (auto)  guy will help us out  

I would think, that it is the same, as the chevy guys, were talking about....

There are various ways to get a higher gear in your old Chevy. ...

1950 - 54 Power Glide rearends will bolt into 37 - 54 passenger cars. ... 

If i look closely, your Pontiac is like a US one, because you don't have the straight axle in front, and open drive line. 

Maybe I'm wrong but your's was maybe made here but it's a US model to me.

Someone can confirm?

Do you have the flat head engine in it?

Sorry to spoil the party....

Fitz.

It also has coil spring rear suspension, the american pontiac has leaf spring i believe. Correct me if i am wrong.

I'm going thru my gm part book it covers from 37 to 51 and and interesting thing that come up is that in 39 they are listing a 25,26 and a 28 model that is imported. yours is also listed as a chieftain six sedan (25-19). all the other listing chev, olds buick and chev/maple leag/gmc trucks nothing imported.

Majestics Canada wrote:

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My car is Canadian built. I live in Vancouver, B.C. Canada. All the Canadian built 39 Pontiacs from my understanding have a open drive rearend with coil spring suspension, not leaf springs. Someone correct me if i am wrong. Here are some pictures, sorry not the greatest, i will try and get better ones.

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If it looks like a Canadian built, and says its a Canadian built, (by tag)  then its got a       CHEVROLET 37-54 rear end.....

 

-- Edited by 427carl on Monday 25th of October 2010 07:35:20 PM

427carl wrote:

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Majestics Canada wrote:

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My car is Canadian built. I live in Vancouver, B.C. Canada. All the Canadian built 39 Pontiacs from my understanding have a open drive rearend with coil spring suspension, not leaf springs. Someone correct me if i am wrong. Here are some pictures, sorry not the greatest, i will try and get better ones.

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If it looks like a Canadian built, and says its a Canadian built, (by tag)  then its got a       CHEVROLET 37-54 rear end.....

 

-- Edited by 427carl on Monday 25th of October 2010 07:35:20 PM

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 I am confused. Isnt the chevy rearend closed drive and leaf spring. Does this mean my gears are the same inside??

I'm probably not helping, but when you say closed drive are you refering to a torque tube design with no u-joint on the rearend. isn't yours a torque tube? from what i can tell pontiac used the same rearend for a while but only had coil springs for one year.

Stephenzone wrote:

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I'm probably not helping, but when you say closed drive are you refering to a torque tube design with no u-joint on the rearend. isn't yours a torque tube? from what i can tell pontiac used the same rearend for a while but only had coil springs for one year.

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Mine is a open drive, with coil spring front and rear suspension. Yes closed i mean torque tube, mine is not. It is 6 lug bolt pattern. Seems like mine is some oddball creation??