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Old 08-24-2006, 11:20 PM
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Driveshaft loop

Looking to purchase universal driveshaft safety loop. Only thing NHRA rules states that the drive shaft loop must be at 6 inches from where the driveshaft connects to transmission. I have a gear vendor overdrive linked to the transmission, then to the driveshaft.

My question is, would Competition Engineering's drive shaft loop clear the Gear Vendor?

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Old 08-25-2006, 12:29 AM
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Since the driveshaft loop is going to be 6" behind the Gear Vendor unit, I'm not too sure if I understand your question. That 6" measurement places the loop about 3" behind the universal joint and is to keep the shaft from either poking up through the floorboard or sticking itself in the ground. In reality it works for a few revolutions until the driveshaft bows and shortens up past the loop. Next events are it usually breaks in two and the trans case breaks up into several pieces. Very exciting when it happens at the finish line. You can always tell those of us that have lost a driveshaft - we're the ones with three loops spaced down the length of the driveshaft.
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Old 08-25-2006, 07:07 AM
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Oh I see, I thought it had to be from 6 inches from the motor to transmission connection but since the gear vendor is really an extension of the transmission, I would measure 3 inches from the Gear vendor and universal joint.

Thanks for the info.
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Old 08-25-2006, 01:38 PM
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When you install it just make sure that you set the distance no more than 6" behind the end of the gear vendor unit. They probably won't bother to tape it but if it is further than 6" they could fail your tech inspection. And while you can put it closer; the closer to the 6" limit you get it the more good it will do you if you need it.
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Old 08-25-2006, 02:18 PM
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The six inches is 6 inches from your front universal yoke. The drive shaft vendor is a extension of the transmission so go 6 inches behind it.
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Old 08-26-2006, 01:56 AM
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I stand corrected:

"Most Racing venues require a driveshaft loop when your car reaches a certain performance level. The NHRA rules require a driveshaft loop within 6" of the front U-joint when your car is capable of 13.99 quarter mile times with slicks or 13.00 with street tires."

So the rules call for the loop within 6" of the universal joint as Henry Highrise stated (and not the rear of the trans/overdrive unit).
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