Had the exact same set on my Bronco II . They worked great... Easy to install and no removing of the rear axle bolts.... Just bolt on and go!!!!!!
The only thing they did not do was use the counteraction of the axle wrap to "LIFT" the back of the truck for added traction and quicker 0-60 times...
I am still ( if i get off my but) working on a Lift bar setup that would make the front half of the spring almost solid and only allow movement up and down with no twisting..
YES, this will make a much stiffer ride, But it eliminates close to 90% wheel spin....
Todd Z