Flywheel
Passenger cars used a smaller flywheel for a 10" clutch and trucks used a larger flywheel for an 11" clutch.
The balance should also be different. 68-80 the 302 has a 28.2 imbalance and the 81 and up ending had a 50.0 inbalance.
What you are want to do is take the numbers off the part, especially if both are Ford items, and call a place like NAPA and cross reference them to make sure what application the are for.


