Your local auto parts (NAPA, AutoZone, etc) are fine for general plugs, wires, and other tuneup items.

For axles and U-joints, check out QuadraTech and Morris 4x4 Center (http://www.jeep4x4center.com/)

Not sure why he would say the axle needs replacing soon. Generally, if you need to replace an axle, you will know it needs to be replaced.

U-joints can show signs of wear.


John Stewart
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