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[66Restomod]

The Coleman aluminum drive shaft from Street or Track I am using said it requires 3/4 to 1 inch of free play.

From website: http://www.streetortrack.com/Custom-...-pr-16159.html

Measuring Procedure:

The most important dimension in ordering a drive shaft is the length. This length is expressed as the distance between the centers of the front and rear u-joints.

To arrive at this dimension, first raise the car off the ground, being very careful to insure that the normal vehicle weight is being supported by the rear suspension. (The suspension is not at full droop or unnecessarily compressed.)

Take the slip yoke that the driveshaft will be assembled to and insert it all the way into the tailshaft housing of the transmission. Now pull it out 3/4" to 1". This will be the free play that all driveshafts need when the suspension moves through its full range of travel.

Carefully measure the distance between the centers of the front and rear u-joints. Double check the 3/4" to 1" free play in the slip yoke and measure again. Measure twice, order once!

This is the length for your new aluminum drive shaft.

Good Luck and Be Safe
Ron