My friend has a 1995 Ford F250 4x4 with a 5 speed manual, 7.5L gas engine. We just replaced the clutch disc, clutch cover, clutch release bearing, pilot bearing, slave cylinder, and clutch master cylinder. The truck was driving fine before the change but the release bearing was squealing and the clutch started started to slip so we decided decided to put in new everything. Only now, the truck won't go Into gear. We've bled the line and everything so it's not that(unless all the new parts aren't tolerating any bit of air at all). Now, if we jack up the rear end so the wheels are off the ground, it goes into gear and shifts through them and the tires spin. With the tires on the ground it won't go into gear at all. We already pulled the transmission back off to check the parts were installed properly and everything looks good. I think maybe the bearing isn't putting enough pressure on the plate to release the clutch or the slave cylinder isn't strong enough but I'd like some more opinions. Advice is appreciated, thank you.