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Re: Just acquired this 86 k2500 4x4 suburban!
Couldn't be 100 percent, but i do know the newer 3/4ton (maybe 1/2 ton also) chevys are prone to the flex plates cracking and giving a similar tapping noise.
This might sound like a dumb question also but have you drained the oil to see what it looked like?
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1995 GMC K1500 Suburban 6" Pro comp 35x12.50R17
LSXburb -Build- 1990 GMC Suburban 6.0 Lq4 4l80e np205 D60 14FF
1988 GMC suburban 350ci Sm465 D60 14FF 8" 39.5x15R15
1969 Pontiac Lemans 400ci Muncie 4 speed
2009 Pontiac G8 Gxp M6
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