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I agree the spring needs to be removed. It seems to be a consistent problem with the clutch pedal going to the floor. Please excuse my ignorance but what do you mean by long style clutch?
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There are two different style three finger pressure plates for these older cars. The type found on Fords and the type found on Mopars. The type on Mopars were called Borg and Beck. Not sure why, I think that was either the original mfg or original designers of that style. But, the three fingers on it are shorter and wider than what Ford uses and made of stamped steel. I think to simplify distinction between them, the term "long" became a common term to describe the type of three finger pressure plate used on Fords.
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I see...I never knew that. Thank you for the lesson. So the position of the diaphragm must be shallower than the finger style clutch thus you lose the travel and the ability to properly adjust. That makes sense. I don't understand why my 66 Mustang clutch pedal operates correctly with a diaphragm clutch. Is this an issue only with the later models?
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From what I understood, the diaphragm type clutch doesn't need as much pedal travel. That made sense. Especially when I look at how high my clutch pedal sits compared to the brake pedal. Without measuring, my clutch pedal sits about 1-1/2" to 2" higher than the brake pedal and it needs all the travel for correct operation.
Many people like the diaphragm type clutch in these older cars. Some complain they cannot get the correct adjustment and the engagement to disengagement is very high in the pedal travel. I'm thinking I don't want to remove that assist spring to try a diaphragm clutch. With my luck I'd want to go back to stock and fight to get that spring back in. I was hoping by now the diaphragm clutches for these cars were made to work with the original assist spring installed.
My neighbor had a 1965 Fastback that has been in his family since new. It no longer runs and drives and is ready for a full restoration. But he always tries to compare items to my 1969. It's like apples and oranges. They are completely different beasts. So what works and fits fine in a 1965 or 1966 doesn't necessarily work or fit fine in a 1969.