When I was in SC and had my shop I had Joint and Clutch do all my drive shafts with no problems. They had excellent customer service and were very easy to deal with. Almost everyone I know in SC that races had there drive shaft made there. My drive shaft that I have in my racecar ended up not needing any weights, and it has no vibration. It seems like you took them some measurements and said make me a drive shaft, its always best to find out how that shop wants the measurements done, each is a little differnt. Something doesnt seem right though, but it seems odd you gave them two measurements and get two drive shafts that dont fit.
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1999 Z28 Camaro|Cut up
2003 CC Duramax Dually|19.5 w/245/70/19.5|5in exhaust
2009 G8 GT 408hp/402tq sae|Rotofab CAI|LS9 Cam|Headers|GXP Mufflers|Custom System
2009 Tahoe stock
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