Yup many things could have done it.
Sounds too me you front axel needs to be gone thru from hub to hub. Maby get a donor axel you can tear apart to see how it all works, then rebuild the one under your truck.
Good Luck
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1972 K5 MPFI454/Sm465/Np205/D60/14FFd/Re-Centerd H1s w/Swamper Iroks
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