I learned so much from making this episode. I go DEEP into the tech behind leaf springs, shackle lengths and shackle angles using my homemade Bored o' Leafs. I hope you get something out of it!
Here is the formula I used
H = Sin(A) * L
Or, where SpL = spring length (dead flat), and MH = the distance between spring mount and shackle hanger:
MH = SpL - Sin(A) * ShL