Hello my name is Dave.
It sounds like you most likely have a worn clutch, the hydraulic system needing bled would not directly cause the clutch to slip, it would have to be some sort of mechanical issue not allowing the throw-out bearing to completely disengage and therefore wearing the clutch disk prematurely. One thing to check is if you have any play at the top of the clutch pedal travel, if you don't that would lead me to believe that something has happened not allowing the slave cylinder to fully release the throw-out bearing.
Unfortunately the only thing I can think of that could possibly cause your clutch to slip that wouldn't involve removing the transmission would be the clutch pedal itself not allowing the throw-out bearing to fully disengage from the pressure plate. If you have some play when the clutch pedal it at the top of it's travel then you are left with the only option being to remove the transmission to repair the problem since you have to remove it to even to replace the slave cylinder. I have attached a diagram on the clutch pedal system, if your pedal is holding the slave cylinder from releasing when you when you remove the linkage from your pedal (1) it will not line back up without pushing it in.
If you have to remove it I would highly recommend replacing everything including the slave cylinder and having the flywheel surfaced at a machine shop. I have been finding a lot of my parts at surprisingly good prices and quality on Amazon so I would look there for good deals on what you need.
Please keep us up to date on your progress and thank you for using 2CarPros!
Thursday, December 17th, 2020 AT 4:45 AM