* Hydraulic Clutch System: The hydraulics are responsible for disengaging the clutch, allowing you to shift. Problems in this system directly impact your ability to shift gears. A failing master cylinder, slave cylinder, or a leak in the lines would all cause a hard clutch and difficult shifting.
* Clutch Wear: A worn-out clutch disc, pressure plate, or throwout bearing can also cause this issue. As these components wear, they lose their ability to fully disengage, resulting in difficulty shifting.
* Transmission Issues (Less Likely): While transmission problems *can* cause shifting issues, they usually manifest as grinding, popping, or difficulty shifting into *specific* gears, rather than a general difficulty across the board. The sudden onset of the problem also points away from a gradual transmission failure.
Before assuming transmission problems, check the following:
1. Clutch Fluid Level: Check the clutch master cylinder reservoir. Low fluid indicates a leak somewhere in the hydraulic system.
2. Clutch Pedal Feel: Does the clutch pedal feel spongy, hard, or does it go all the way to the floor? This can help pinpoint the problem area in the hydraulic system.
3. Clutch Cable (If applicable): While you stated it's a hydraulic clutch, double-check that there's no cable involved in the clutch operation. A cable could be broken or frayed. (Less likely given your description, but worth a quick visual check.)
4. Slave Cylinder: This is a common point of failure in hydraulic clutch systems. A leaking or malfunctioning slave cylinder will make shifting very difficult or impossible.
If you find low fluid or a spongy/low pedal: You likely have a leak in your hydraulic system (master cylinder, slave cylinder, hose). This is a relatively inexpensive fix compared to a transmission overhaul.
If the pedal is hard and fluid level is okay: This could still point to issues with the slave cylinder or internal clutch components.
In short: Start with the clutch hydraulic system. If you're not comfortable working on it yourself, take it to a mechanic specializing in older vehicles. Diagnosing a clutch problem is much cheaper and easier than assuming a transmission issue.
