I have a 2006 Mustang GT with a manual transmission. The car shifts fine when cold, then gets more and more difficult until it will no longer shift. This is over the span of 20 minutes or so. I had a full clutch kit intalled approximately 5,000 miles ago and had the brake fluid replaced. That said, I figured it had to be the clutch master cylinder. Replaced that and vacuum bled it through the reservior- the clutch is quite firm, so I’m thinking it’s fully bled out.
Problem still occuring. Could it be the clutch again? Maybe a premature slave failure? I really only use this as a Sunday cruiser and don’t drive it hard at all.