It is a loop made of flat metal stock that keeps the front of the driveshaft from hitting the ground in the event of a u-joint failure. It has to be mounted within 6in. from the end of the tranny tailshaft.
In extreme cases the front of the shaft digging into the track can catapult the rear und of the car in the air.
Ive put one on every performance car ive owned just as cheap insurance. It also ups the chances of the driveshaft being salvagable in the event of a failure
Hope this clarifys things. Here is a link with the picture of one. This company has some good quality products. Highly recomended.
Not only that, but when a shaft does break, it can spare the trans tailshaft, mufflers and/or pinion from taking a beating.
1992 Firebird 355/Six Speed (Soon to be LT1)
1991 RS 350 / 700-R4
1987 Toyota Pickup 383 / 500 + HP 10.963 @ 119.95 Slicks / 11.997 @ 114.23 Radials
"Speed KILLS, so drive a FORD and live forever!" http://personal.lig.bellsouth.net/~racer383/
Another important fact that has not been mentioned. The driveshaft loop could save your life. I have heard several cases where a driveshaft broke and came into the car and killed the driver or passenger.
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