Manual 4-speed transmission pressure plate diameter – 1970 383 Magnum

Hi All. I have a 1970 Challenger R/T 383 Magnum, 4-speed manual transmission. The transmission is not the original, it's from a B-body (0A######). What would be the pressure plate diameter? I'm thinking it's an 11 inch? An issue that I have is when letting the clutch out going in reverse, 1st gear, and 3rd gear I hear grinding. On the road the car won't go into third gear. I checked the linkage and it appears to be ok. I put transmission fluid in it so I don't think that's the problem. I...

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Author: 70SunFun