Mark Houlahan
Tech Editor, Mustang Monthly
October 1, 2003

Having a safety loop to retain your driveshaft is only being smart. Whether you have a 500hp race car with slicks or a 250hp street car on radials, a driveshaft universal-joint failure can happen to either one. Get a little too aggressive with your clutch work and you just might snap a fatigued or dried-out joint while banging gears.

We're not saying a driveshaft failure is inevitable, but if you drive hard, why not add some peace of mind by installing a safety loop? Without it you could be asking for a hairy ride, as a failure of the front joint will often cause a car to "pole vault" up in the rear and even flip the car over or have it land on its side.

NMRA rules-as well as those of other sanctioning bodies-require a safety loop. Since we had previously installed HP Motorsport's suspension goodies and other trick items on our Real Street project, we decided to install one of its safety loops, the HPM-4000AZ ($39). This loop provides extra clearance for larger-diameter, aluminum driveshafts.

The job requires only a drill and some hand tools-no welding, no fuss. The safety loop can be installed in about an hour. Afterward, you'll feel much better about dropping the hammer.

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