Limited slip or not? - Pontiac GTO Forum
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post #1 of 13 (permalink) Old 10-03-2015, 02:02 PM Thread Starter
 
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Limited slip or not?

Just bought a restored '64 with a .030 over 455/tri-power. I was told that it has a non-posi rear, so I wanted to verify. I raised the rear tires and spun one of them to see what the other one did, and it did not turn at all. Same result when I spun the other tire. It took more effort than I thought to spin each wheel, & the drive shaft turned both times. My knowledge is that with an open rear, other tire should spin opposite, and with a posi rear it should spin the same direction. What may be going on here?

Thanks for any guidance.
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post #2 of 13 (permalink) Old 10-03-2015, 04:10 PM
 
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Originally Posted by vev46 View Post
Just bought a restored '64 with a .030 over 455/tri-power. I was told that it has a non-posi rear, so I wanted to verify. I raised the rear tires and spun one of them to see what the other one did, and it did not turn at all. Same result when I spun the other tire. It took more effort than I thought to spin each wheel, & the drive shaft turned both times. My knowledge is that with an open rear, other tire should spin opposite, and with a posi rear it should spin the same direction. What may be going on here?

Thanks for any guidance.
It's not a posi. Nothing going on.
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post #3 of 13 (permalink) Old 10-03-2015, 08:50 PM
 
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The driveshaft spinning is the question; was the transmission in gear (manual transmission) or park (automatic)?


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post #4 of 13 (permalink) Old 10-04-2015, 05:12 PM Thread Starter
 
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4-speed muncie, in neutral
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post #5 of 13 (permalink) Old 10-05-2015, 07:41 AM
 
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The transmission needs to be in gear to check for posi vs open rear.


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post #6 of 13 (permalink) Old 10-05-2015, 01:33 PM
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Uhh, no.
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post #7 of 13 (permalink) Old 10-05-2015, 01:39 PM
 
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The transmission needs to be in gear to check for posi vs open rear.
If you think about that statement you'll understand why it's wrong. With an automatic, it does nothing, with a stick you're turning the drive shaft, transmission, clutch and, therefore, the engine.......

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post #8 of 13 (permalink) Old 10-05-2015, 02:58 PM
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I thought about swapping my pegleg out with a posi but the more I thought about it I decided to just keep it original.
I don't plan on drag racing the car and since I live in the mountains and drive these roads drifting or swapping ends isn't something I need to do.
Think about how you plan on driving the car before you spend the money to change it out.
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post #9 of 13 (permalink) Old 10-06-2015, 01:47 PM
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One tire in the grass the other on the road, do a small burnout both tires will spin if it's a limited slip. If it's open just the one in the grass will spin. You could always do an Auburn posi unit, my limited slip one went out so I put one in mine years ago and never looked back.
http://www.auburngear.com/
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post #10 of 13 (permalink) Old 10-06-2015, 11:57 PM
 
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I have always liked 2 black lines ,myself.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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