8 3/4" for the Duster

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Jim Kueneman

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I am using the stock leaf springs in the '72 Duster and have a pre '68-'70 8 3/4" for it. The perches have been cut off and new ones ready to install. Am I safe expecting with stock springs where the perches sit to be parallel with the bottom of the car? So can I safely align the perches with a -8 degree (with respect to 90 degrees) or so angle to the face of where the center chunk bolts to and have it come out fairly close to -8 degrees when all together? I don't have the K-frame and power train in the car yet and would like to get the rear axle done before that happens.

Thanks.
 
An 8 degree negative perch angle will bind the U-joints.

If you want to duplicate the stock A-body pinion angle, weld the perches at 43" on center. The pinion should angle upward 5 degrees when the perches are level with the ground.
 
An 8 degree negative perch angle will bind the U-joints.

If you want to duplicate the stock A-body pinion angle, weld the perches at 43" on center. The pinion should angle upward 5 degrees when the perches are level with the ground.

Thanks, I swore I read it should be angled down (maybe that was for maximum traction drag racing). Thanks. I have and order in your cart for reseal kits, brake lines and brake hardware once I go out and measure for the correct lines!
 
Pinion angle is relative to the transmission center-line, not to the ground. Even though the pinion appears to angle upward, it is actually 2 degrees negative when compared to the transmission.
 
What brake hose will reach from the '72 Duster hard line bracket to the junction block on a late '60s 8 3/4". It is the one that has the block closer to the center of the axle.
 
Thanks, I swore I read it should be angled down (maybe that was for maximum traction drag racing). Thanks. I have and order in your cart for reseal kits, brake lines and brake hardware once I go out and measure for the correct lines!
Or like maximum vibration drag racing! LOL:poke:Dr diff has spoken on the subject nuff said...:thumbsup:
 
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