if your clutch is slipping it probably means your friction disk is near dead or your clutch master is near dead or both. Which means that it needs to be replaced.
It is in the trunk.
To install a clutch in a 1969 Roadrunner, first, ensure the vehicle is securely lifted and supported. Remove the transmission by disconnecting the driveshaft, shifter linkage, and any necessary electrical connections. After removing the old clutch assembly, clean the flywheel and install the new clutch disc and pressure plate, ensuring proper alignment using a clutch alignment tool. Finally, reattach the transmission and all removed components, and adjust the clutch linkage as needed before testing.
The stock clutch for a 1969 z28 is 10.5". The 1970 z28 went to a 11".
According to one of Fords websites : For a 1969 Mercury Cougar ( all factory available engine sizes ) ( .035 inch spark plug gap )
No.
Try starting with the Department of Motor Vehicles.
Do Not Adjust Your Set ended on 1969-05-14.
You don't
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Using a 1969 Ford Mustang or a 1969 Mercury Cougar with the 351 cubic inch / 5.8 litre V8 as examples : ( Motorcraft FL-1-A engine oil filter )
You don't just adjust it. you need to replace the tierod ends and possibly the king pins.
You have to shift gears in all of them, so you'd call them "manual," but in 1969 you could get an "autostick" transmission that had an automatic clutch connected to a manual transmission.