Factory shackles are 3 and 1/8 inch center to center.I have 5-leaf springs on my 68 RS/SS with a 350.
I replaced all the worn-out bushings on the back end with Detroit Speed Urethanes and their H-D Shackle Kit.
The Shackles I removed were homemade and were 3-1/8" hole-to-hole for length. The Detroit Speed's are 3-1/2" hole-to-hole.
Currently, my car body sits 7/8" higher in the back then it does up front.
What was factory for stance?
After a twenty mile trip through town and parked for a night...After following along, I measured mine (less the hood) and the front was 8.5 and the rear was 9.25. I like that .great info guys.
Is this pretty close with all the options you have on the car?
When you assembled the rear springs, did you bounce the rear end a lot before tightening the shackles?
I ran the numbers using the AIM.Is this pretty close with all the options you have on the car?
I did not.When you assembled the rear springs, did you bounce the rear end a lot before tightening the shackles?
Those are all good points. I used the “shipped” column in the AIM which just has a couple gallons of gas for a requirement.I didn't see this in the any of the above discussion posts, but you need to be on level ground, for curb weight a full tank of gas and 24psi tire pressure all four per AIM. JD
Pretty sure close enough looks good enough today. I do believe shipped cars were 1/2 a tank of fuel.Those are all good points. I used the “shipped” column in the AIM which just has a couple gallons of gas for a requirement.
I certainly appreciate your insights into bias, ply, tire construction. I don’t have any personal first-hand experience with those tires.
I started thinking the same thing with the bias-ply tires. Ultimately, my question was only about stance. With all four tires originally being the same but of a completely different profile I won’t get a number for exact vehicle height - but, I will get an idea of how the car might have sat.
it appears slightly nose up off the assembly line and now tail up 55 years later in my garage.
IMO - doesn't matter, your car sits dang near perfect in my book, I like some gap at the top, to me looks aggressive.What was factory for stance?