After replacing slave cylinder I can't get pressure in clutch pedal

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The truck was turned off at gas station, went to turn back on and wouldn't go into gear while idiling. Had to start in first and float it home, replaced the slave cylinder and it started and went into gear, with drive shaft pulled. Put the drive shaft back on and blead the cylinder and won't go back into gear. It trys to grind if I put ot into reverse but any other gear it just wants to bog the motor.took slave cylinder back,and got a New one, same thing, no pressure on clutch pedal. But yet I can start it in first and float the,gears when I needed to get around, so it will shift at the right speed when not on neutral. I can not get any pressure,in clutch pedal for it to engage. Trying to avoid pulling transmission to put in New clutch kit, what else can it be,or can I do It hold fluid,never even. Got low First and second where always very iffy to down shift unless,i came to a slow speed, but no real prior issues.