[Keith Seymore]

Originally Posted by Nasblu

Also notice in the body drop picture of the blue Monte Carlo the driveshaft dampner attached to front yolk looks like a harmonic balancer only smaller. Also on the Cranberry Red body drop picture looks like the car has redline tires which I have never seen before on any of the 1970 Monte Carlo built sheet I have ever seen.

Good eye.

You may already know but that is to control rear axle whine (as a result of "non conjugal meshing action" of the ring an pinion). The resulting disturbance is transmitted up the driveshaft, causing it to wind up and relax like a rubber band, the order of the disturbance being commensurate with the number of teeth on the pinion gear. The damper is tuned to attack the resonant frequency of the shaft. You can put them on the rear axle companion flange as well, but they are not as effective because the amplitude of the disturbance is bigger the farther forward you go.

We used a lot of those on the old Astro/Safari vans, and on GMT400 pickups with the aluminum one piece shafts.

K