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i had the same clunking sound when in 4wd
i tracked down to a grease zerk on the driveshaft was ticking on the exhast. i just took the grease fitting out and put in a little plug
stan
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79 chevy k20 350/350/205/D44/14bFF
4.56 gears rock 
LWB pimer black
01 S-10 ZR2 extended cab
4.3/4L60E/233
3.73 gear 31" DICK CEPEK CRUSHERS
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