Originally Posted by NumberDummy

C3AZ6375L .. Flywheel (Flexplate) 157 teeth / Use with C4 transmission / Obsolete

Fits: 1965/68 289 / 1968/76 302

This should be EZ to find at autoparts stores, but if you want a gen-u-ine Ford original, I found dozens of them at FoMoCo Dealers, obsolete parts vendors.

The last MSRP was $245.83, dealer net cost was $147.50. Because the part is obsolete, the dealers can no longer return it to Ford, so are STUCK with it.

DON SANDERSON FORD in Glendale AZ has THREE (623-842-8762) and usually sells obsolete parts at below their original net cost.
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There is another flexplate that has 164 teeth. It was used in full sized Fords with 289's and FX Cruise-O-Matic, and on 1978/80 302's.

Note the edited in info regarding I-6 flywheels in post #

Originally Posted by tardster

Ok this is what I ordered from autoxone, please let me know if it is the correct one please;
AutoZone.com | | Flywheel - Automatic Transmission | FLYWHEEL ASSEMBLY

Originally Posted by NumberDummy

I cannot tell by pictures. I can only go by Ford part and/or ID engineering numbers.

How many teeth does it have? 157 is correct, 164 is not.

Originally Posted by ALBUQ F-1

Here's a good article...... has a pic of the difference between 28 and 50 oz dampers

Eaton Balancing Engine Balancing, Part 2