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Originally Posted by ChevLoRay
I believe the correct type of front axle "knuckles" for your truck are what are called Cardon Joints. They're sealed and look like they would swivel....they're round on the back side where they attach to the axle housing. I believe they are lubricated by the oil in the front differential.
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Sounds like you are describing the 1969 and earlier axle. in '70 they switched to an open knuckle.
I guess I had my head up my butt. I looked in my 1972 Service Manual (the one published by GM). For the four wheel drives, it doesn't list ball joints or axle joints as lube points. Only things it lists related to the front axle are wheel bearings, tie rod ends, and drag link ends.
I guess that's pretty conclusive evidence that the ball joints and the axle joints didn't have zerks in 1972. It does list the ball joints for 2 wheel drives...