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 Rear end center section

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Arnie1964
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PostSubject: Rear end center section   Sat Dec 24, 2011 8:21 am

for a 1957 plymouth 6 cylinder car built before feb 15 1957 espicailly if the car had overdrive. If it did not have overdrive and was a 6 cyl it is OK. PM me with what you have and a price. Some of you may have converted you 6 to a V8 and changed your rear to something newer. Chrissy???

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PostSubject: Re: Rear end center section   Sun Dec 25, 2011 12:24 am

The rear is the same Tapered Axle set up for 57/58. Overdrive relates to the Tranny, not the rear. The gear's may be a bit steaper. I recommend a gear of 3:31, 3:36's if you are putting a V8 in the car. The Center Section is most likely a 741, non sure grip which is fine for a stock V8 or Six Cyl. Good Luck.
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PostSubject: Re: Rear end center section   Sun Dec 25, 2011 6:57 am

Looking for the six rear Joe because they are a lower gear ratio before Feb 15 of 1957. 3.73 was the stock gear, 3.9 for what they called a mountain grear and the overdrive came with a 4.1 . Not a lot of torque in a 318 so the lower gear ratio will give you that extra get up and go.

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PostSubject: Re: Rear end center section   Tue Dec 27, 2011 1:40 pm

Jim,

I would go with Jim;'s suggestions for gearing, taller gears will give you poor mileage, and quicker engine wear due to higher RPM. The poly engines have plenty of power to run the lower ratios, which most were equipped with.

I do have six cylinder and 6 Cyl./ O.D. differentials as well. if you do go that route.

---John

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PostSubject: Re: Rear end center section   Wed Dec 28, 2011 10:26 am

The factory correct rear pot would probably be a 653 casting. I would just stick in a commonly available 3.23 or 3.55. A lot easier to find...if you are anyone but Big M that is! lol

The stock mid 70's 350 chevy with a 2 brl in my car has enough guts to move it pretty good, and the 318 poly has a lot more torque than this turd of a motor. My car has a 3.73 rear gear right now.



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