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.
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 )
Do Not Adjust Your Set ended on 1969-05-14.
No.
Try starting with the Department of Motor Vehicles.
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.
You do it very carefully so that you don't break your car