Re: 67-72 Caltrac's ???
It might require a different Caltrac bar that what is offered for the truck, but the concept should work. A cars rear is on top of the leafs and caltrac mounts to the bottom of the leaf. It would be the same on the truck.
Most cars run a 26-27" tall tire maybe a 28" if they can fit it. A truck generally will have a 28-30" tire providing a little more clearance from axle center-line. I wouldn't be surprised to see the front spring mount have more clearance as well.
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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