12:05 Garage- ’70 Duster build

1971-74 Mopar A B E Body Seat Belts - 3 Point Conversion - Bucket Seats - Starburst Buckle

I need to educate myself on how to measure/calculate motion ratio. I’ll have it apart tomorrow to change out the springs so I’ll do it then and report back.

Yeah with the motion ratio you’d be able to calculate the wheel rate, so you’d be able to compare it to similar Mopars with torsion bars. This is a decent explanation

Spring Rates Part 1: The Motion Ratio

And RideTech has a full on calculator for calculating spring rates based on corner weights, etc. But one part is that is a decent schematic showing how to measure motion ratio

Spring Rate Calculator - Ridetech

For @DionR, my seat belts are in fact from from seat belt planet. They’re a custom set because they didn’t have an application for a Duster at the time, they’re 140" length, 12" sleeve (bucket seats), 8" extension on the shoulder loop. I feel like they fit pretty well with placement of the belt for me anyway.

3 Point Retractable Seat Belt with All Metal Push Button Buckle