This is what happens to 3rd gear in a Hemi 18 spline 4-speed when you have too heavy of a car and too much power. My son's just broke two days ago. It has absolutely nothing to do with the clutch......

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68 cuda formula S 588" bb 5sp
70 CUDA CONVERT 500" 5SP (SUBLIME)
70 CUDA CONVERT 500" 5SP (PLUMCRAZY):TOO MUCH HORSEPOWER, IS ALMOST ENOUGH!