Hard time shifting. replaced clutch slave cylinder. still shifts hard. plenty of clutch fluid.

Sometimes the slave cylinder takes a little extra bleeding to remove the air in it & until it's all gone, the clutch won't open completely, causing the problem you are describing.

If the shifting can be done between all of the gears while the engine isn't running on level ground then the forks should be ok & not bent inside the transmission and you should be able to get the car to shift properly.

I've done several of these and found that if you start by making sure the Clutch Master cylinder is full, and remember when you add fluid, try to add without aerating the fluid. Pouring down the side of a funnel is better than pouring straight into the container as fluid picks up air during the splash. Hopefully doing it this way will prevent small new air bubbles from getting back into the lines when bleeding.

Next, after having one person pump the clutch pedal quickly 3 or 4 times & continuing to hold the pedal to the floor until you've completed this phase, instead of just releasing the pressure through the bleeder valve, also push on the clutch fork/rod to go ahead & force the fluid completely out of the slave cylinder, tighten the bleeder and have the assistant slowly pump the pedal to bring the slave cylinder back into contact to where it was before you pushed it to drain it. Refill & bleed as usual a couple of times. If you don't have a good clutch pedal now with good release, you need to check the Clutch Master Cyliinder since once the bleeding is done, this is a completely automatically adjusting system. good luck