Just put a new clutch in my 98 blazer I have bench bled the system to start that gave me pedal but not as good as it should be, then I had my dad pump the pedal while I was underneath at the bleeder and that method lost what little pressure I had... I then bench bled the master cylinder and gravity bled the slave got a decent pedal but not as good as a new clutch should be, plus it still grinds in reverse anyone have any ideas????

 

You probably have an air bubble in the slave cylinder. I'm not sure how yours is mounted. However, the last time I had to get one bled, I pulled the slave cylinder and pressed the piston back in. This backs the fluid up and any air bubbles will bubble up. Be sure to draw some of the fluid out of the master so you don't blow brake fluid (it eats paint) all over your chassis.

 

try googling it. sometimes theres weird procedures you have to do in order to bleed clutches. we did a ranger before and you have to lift the front end like 3 feet into the air in order to bleed the system

 

try and get your hands on a vac bleeder
I have one for doing bike and snowmobile stuff and always have success
If you get one , make sure to put some teflon (plumbers) tape on the threads of the bleeder screw
I would also recommend doing it with the front end slightly raised assuming that puts the bleeder screw higher than on level ground