Could be just enough slack in the differential (worn out) to clunk. I can tell on mine when doing about 35-40 and tap the gas. It clucks when it tap the gas to accelerate then it does it again when I let off. I was hoping for the best but these things happen when you get a complete unknown mileage rear end.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73
1992 Camaro RS 305 TBI
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