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I used to hear that same noise just before my carrier bearing went out. Be sure you mark the drive shaft/yoke orientations before disassembly so that everything goes back together without having to re-balance the drive shaft. It's not hard, just time consuming and dirty. I used a large vice and a 3/4 in. socket to press the u-joints in and out. Good luck and keep on truckin'......Jerry
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'68 c-10 long wheelbase fleetside, been in family since new, originally 250 3 speed
Now (389) 350 .060 over 3.75 stroke,Edelbrock Performer RPM 70cc heads and Intake
600 cfm Edelbrock,Small Comp Cams retro-roller cam and roller rockers,9:1 cr, headers, HEI,Old Air a/c, 72 power disc brakes w/stainless lines, 3.42 gear,T-56 6-speed, original paint(what's left of it). Dakota Digital Dash
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