There has always been lot of confusion in the Mustang world about how to set up an adjustable rear suspension properly, so that the driveline works properly on the street, the strip, and the road course. You often hear terms like pinion angle and driveshaft angle tossed around, but if you’re new to Mustangs these terms might not even make sense to you.

BMR Suspension is one of the aftermarket’s leading suspension products manufacturers, so when we found this video of their lead Ford technician, Kelly Aiken, describing how to set up an S197 Mustang’s rear suspension, we had to share it. There are full on-car visuals of how the suspension works in particular situations, and then how to correct the issues that crop up with weak factory parts.

The incredible amount of movement presented by the stock parts goes to show just why the S197 is prone to wheelhop when power is applied. Aiken goes on to discuss how the angle of the pinion flange in relation to the angle presented by the transmission can cause bind or vibrations under load.

There are suggestions on where to set up the company’s adjustable parts in relation to the dimensions of the stock parts, and then how to adjust it – and more importantly, why you’re adjusting it and what it will do for you.

For many enthusiasts, learning these concepts comes by seeing how it’s done. Judging from the amount of incorrect technical information we’ve seen floating around forums and social media lately, this video should be mandatory viewing for anyone attempting to dispense advice about suspension setup – and anyone with a Mustang that’s looking to go fast.