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post #1 of 5 (permalink) Old 10-16-2019, 09:12 PM Thread Starter
 
 
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Impala

Hey everyone im new to this i have a question i have 64 impala i wanted to put in a posi my engine is 283 v8 can i put a 5.38posi
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post #2 of 5 (permalink) Old 10-16-2019, 10:36 PM
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No

Highest ratio from the factory was a 4.10

Highest from the aftermarket was a 4.56

Posi yes, but I wouldn't put any money in that rear end.

When I was younger they were plentiful and cheap so I could blow up one a week and rebuild another out of the junkyard. I can not recommend that attitude today as they are not plentiful though they are still weak, and subject to failure if abused. Even a 283 can break one if you side stepped the clutch above eight grand. Only justification for a 283 is to shift it at ten grand like I used to. But then again 283's were plentiful back then too, and they used to fail at that RPM frequently.

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post #3 of 5 (permalink) Old 10-18-2019, 03:08 PM
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Garage
Welcome to the team. Why would you need 5.38 posi? Is this a typo??
What are you planning on doing with the car and what transmission do you have?
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post #4 of 5 (permalink) Old 10-18-2019, 04:20 PM
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5.38 is a common twelve bolt gear for a SBC or a light truck towing a heavy trailer.

The rear end in a '64 was designed in 1944 for a 216 cube six cylinder. It was rated for 150% of the torque output of that particular engine (193 x 1.5 equals 289.5 foot pounds of torque max!). Most SBC exceed this amount of torque so the only reason it lives at all is because the tires slip. If they don't; you have a broken rear end. All of the other GM cars had a V8 long before Chevrolet did so they had a stronger Pontiac-Olds style rear that had a massive ring gear and huge axles that puts a Ford nine inch to shame. I looks like the Chevy rear only bigger.

https://www.hotrod.com/articles/1303...bile-rearends/

Because of the eight inch recapped cheater slicks I ran on my '53 Chevy with a 409 power plant I broke my rear end so often I kept another "P" case pumpkin with 4.10 gears ready to bolt in in the side of the road in my trunk.

Big Dave
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post #5 of 5 (permalink) Old 10-22-2019, 01:10 AM
BA.
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Agree with 67SS that using a 5.38 in a stock 10 bolt is a No-Go. Even in a built 10-bolt, the car it self would become a PURE drag-only kind of car.........and probably even IF it had tall tires on it to reduce effective gear ratio.

Short answer - from what you've told us - it can be done but is a bad plan.

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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