Is there a difference in flywheels that came from a truck motor? Maybe even a larger truck motor? I have a '59 292 motor and I'm having a hard time finding a ring gear for it, I bought one off the internet and it would not expand enough to go over the flywheel, I found another one from NAPA and they list the I.D. of the gear. It looks like that gear will have to expand .15" to fit over the flywheel, too much? I think it is. I sent the other gear back and did not measure it but know it was too small, I heated it with torch and stuck 'wheel in freezer. The correct gear will have 146 teeth and the flywheel in question uses a 11" clutch.