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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.
Choose Your Engine
There are a number of things to take into consideration when selecting the the correct coil springs for your vehicle:
Engine Size - Most commonly referred to in terms of liters, is the combined sum of each cylinder's swept volume or the overall engine capacity.
L4 - In-Line or Straight 4 Cylinder Engine.
L6 - In-Line or Straight 6 Cylinder Engine.
V6 - 6 Cylinder V configuration Engine.
V8 - 8 Cylinder V configuration Engine.
w/ AC or w/o AC - Whether or not your vehicle has air conditioning might seem trivial but having AC significantly changes the weight of the front end of a vehicle. Therefore, it is important to choose your coil springs accordingly.
