there's a tread/database where many folks have inputted there setup which includes spring rate, number of turns of pre-load, type of bumper etc.. i'll update this post to include that thread.

but for of now, i have a friend who has kings non-non adjusters with 550lb spring rate and no preload. i weigh ~ 160lbs which is less then what a C4 winch bumper would weigh and we noticed the front ended dropped like 1" when i put my weight on the front end.

i know that 5 turns ~ 1" but i want to use as little pre-load as possible. so that's why i want to try 600lbs spring rates or higher.

how much does your SSO bumper weigh?