Transmission issues

ok so I have a issue all of a sudden its very hard to shift into any gear. I went to work drove fine leaving work I did a 3 point turn and when I got to the end of the jobsite I couldn't seem to get in gears. I thought what the hell. All the way home there was a lot of resistance getting into any of the gears. ok so to help rule out some issues, fluid is about 30k miles old with lucas synthetic gl4 gl5. Clutch is a lce and about 60k old and throwout bearing has been replaced after that again at about 40k ago because I thought the typical 4cyl noise was the throw out. Wrong. I'm pretty sure it isn't syncros because its all gears. Also with engine off theres no issues just sitting still shifting into gears. Any thoughts? Thanks

 

Possibly a bad clutch master cylinder.

 

Maybe so it seems intermittent. I checked all the easy stuff a little while ago pulled out the shifter arm and checked bushings fluid levels are where they should be without discoloration and took a little play out of the clutch pedal. Took it for a little stop and go and worked like it did before. Never great but acceptable kinda the whole motto with this truck i believe.

 

When its acts up, and you fight it into a gear, keep the clutch pedal pushed in and let off the brake. If the truck creeps forward then either something is out of adjustment or the clutch isn't dissenguaging all the way(possible bad clutch cylinder).