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Old 01-20-2008, 06:12 PM   #1
Cobra4B
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Car in the air w/ wheels off and in neutral, driveshaft/axle spin when on... Normal?

Fired up the car after doing my tune up/painting etc and noticed the rear wheels spinning forward. The gearbox was definately in neutral and the car fired up instantly w/o hesitiation.

Is this normal? What's causing the driveshaft etc. to get power?
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Old 01-20-2008, 06:17 PM   #2
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Re: Car in the air w/ wheels off and in neutral, driveshaft/axle spin when on... Normal?

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Originally Posted by Cobra4B
Fired up the car after doing my tune up/painting etc and noticed the rear wheels spinning forward. The gearbox was definately in neutral and the car fired up instantly w/o hesitiation.

Is this normal? What's causing the driveshaft etc. to get power?
Yep, that's normal. With the clutch out and the transmission in neutral, the gear oil moving in the transmission will spin the driveline. This hydraulic principle is what makes a torque converter work in an automatic transmission.
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Old 01-20-2008, 06:27 PM   #3
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Re: Car in the air w/ wheels off and in neutral, driveshaft/axle spin when on... Normal?

and the heavier the gearbox oil (or colder ambient temp) the more it will continue to spin till the oil is warm.
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Old 01-20-2008, 07:00 PM   #4
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Re: Car in the air w/ wheels off and in neutral, driveshaft/axle spin when on... Normal?

^ Thanks guys... that's exactly what I'd assumed (fluid spin like a torque converter). Thanks for confirming.
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