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Re: '71 K20 Growling/Grinding noise
I would think it is the u joints from the info so far. Also being a 4x4 you might want to see if your front shaft is turning eventhough hub and t case are not engaged, this could indicate a tcase or diffy internal problem.
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1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205
1971 GMC 3/4 Ton 4X4
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