1983 Toyota Pickup Clutch

I have an 83 yota, with an 85 22RE and a new G-Series custom tranny. Put it in about 3000 miles ago, I replaced the whole clutch assembly and the slave and master cylinders, shifted and ran great for about 2800 miles then it started to not want to go into first or second gear. Cant get into reverse without grinding have to pump clutch to get into gear sometimes and some times its like the clutch is just slipping! What can it be?