coilover Not seeing why you say no heim joints,my 51 6400 pickup has 10 7/8 rock crawler heim joints with 15x5 coil springs from speedy Bill,s of nebbraska. Has run nearly 10,000 miles since 2018 and is the best daily driver pickup i've had . Links are 1 inch schedule 160 black pipe,differential is original 2-speed. Tough as nails rides fairly well on junk illinois roads,is great on good roads about a 50 MPH truck. Like was said they don't handle like a sting-ray !!