I recently figured the speedo gears I need for my 86. Using the sticky by Atilla, and my having a 9 tooth drive, I need a 24 tooth driven. If I buy an 8 tooth drive, then I can use a 21 tooth. What would be the best combo? I am being told by the tranny guy that a 24 tooth driven may be a little bit to big to go with the 9 tooth. Any ideas? Thanks