1965 pontiac rearend acts like a posi sometimes - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-01-2011, 03:51 AM
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1965 pontiac rearend acts like a posi sometimes

65 pontiac, unsure of gearing but 2.3 ish. believe it to be an open rearend, im confused as to these 2 situations
1 hit the throttle of the line one wheel spins
2 brake stand and both wheels spin
seems to be consistant, I plan on purchasing posi and gears next year for this 470hp 383, but why is it acting like it has posi when doing a brakestand?

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Old 08-01-2011, 06:22 AM
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A differential transmits power to both wheels equally so long as both tires have equal traction. Generally, the right wheel loses traction because the rear end actually rotates counterclockwise because that's the way it torques over due to gear climb. The right wheel tries to lift off the ground while the left side gets planted. If you can find a way to control the torque, it's possible to make an open rear end act more like it has a posi in it. That's one of the reasons you see a battery in the trunk on the right side in some hot rods and drag cars. Chrysler used biased leaf spring setups in their factory hotrods. You can also install an airbag or an airshock just on the right side. There's many ways to help control the rear end....having a posi is always good but it's also good to set up your suspension for the traction if that's what you're trying to do.
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Old 08-01-2011, 06:32 AM
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The drum brakes on you 65 are self-actuating. When the wheel cylinder pushes the shoes out, the front shoe hits the drum and tries to rotate around with it. It is attached to the back shoe by the star wheel assembly. This pushes on the back shoe at the bottom while the top of the back shoe is being pushed on by the wheel cylinder. (This is why the back shoe has the longer lining.) The faster the wheel turns, the greater the tendency for the front shoe to turn, the greater the force on the back shoe, the greater the braking effort. So, once it has greater braking effort, the other wheel has less resistance and begins to spin. At some point very early on in the process, the forces balance and both wheels spin. And you wear out your brake shoes and tires.
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