SHANEH

I Bought My 99 M6 Ss A Couple Years Back(w/75k Miles).it Has Never Shifted Correctly-initially Wouldn't Go Into Reverse But Seemed To Shift Ok/dealer Installed Reverse Syncro-the Car Will Shift Ok In Normal Driving Situations,but Just Won't Shift Under Acceleration Unless I Granny Shift.also Tends To Grind When Its Cold Even Under Normal Driving.the Clutch Looked Fine(centerforce)and I'm Suspecting The Original Owner Just Couldn't Shift And The Sycros Are Shot Or The Dealer Screwed Something Up When Installing The Rear Syncro-what Do You Guys Think?thanks