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I agree with others here that main problem usually low oil. Make sure bearings are in good shape ( if you can't find local, try Torque King 4x4, they have lots of stuff for your 221, and your closed knuckle front axle) Also change all gear oil regularly and use a magnetic plug to get an idea of whats going on inside. ( I always weld a drain plug bung into my Eaton rear ends, like the rest of the running gear they last forever if kept full of CLEAN oil)
These trucks are made to work hard and with a little care are very reliable.
Have fun out on the trails,
Tom