The lock ring is important because it keeps the U-joint in place and keeps it from moving. If you have the wrong lock ring then the U-joint could rock back and forth and cause damage to the the yoke. If you have the outside lock ring it will have a circular shape with tangs and be at the top. If you have the inside lock ring then it'll look like a C and be at the bottom.
Upgrade to Polyurethane
The new line of MOOG sway bar link kits feature unique polyurethane bushings and improved hardware including a solid hex spacer and a one inch barrel lock nut.
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