disengagement issues??
 

so bear with me here is a little back history to my 2012 ram 3500. I started having problems a few month ago getting it in and out of gear; originally reverse, first and second gears. It then progressed to all of the gears and finally would not go into gear at all without it turned off. When the truck was turned off all of the gears worked flawlessly. I talked to many shops and every single one of the immediately said CLUTCH. which didn't seem right to me cause I could put the truck in second gear while it was off and it would start pulling/moving as soon as i turned the key over. Also i have not noticed any sign of slippage while driving. So i went ahead and put a new pre-bled master/slave assembly in the truck and everything thing worked perfect; for a week now it is giving me the same problems of not wanting to go in and out of first, second and reverse. i checked the fluid levels on master it seemed correct hard to tell exact level.

would appreciate any advise you guys could offer.

It would help if you add details about the truck. Standard I presume? When a standard doesn't go into gear good, it's the clutch holding. I'd look at the clutch maser cylinder for fluid/ functionality, and also the cylinder it is pushing to disengage the clutch. Pretty much works the same as the brakes but only movers the clutch.