so after you let the clutch back up and the new gear is engaged and you hit the gas , I hear and feel a "thunk" type noise. what is this? the clutch or the tranny? what fixes it? a tranny mount, different clutch??? feels loose and sloppy.

 

i also got this same problem anyone know what this is its a loud thunk sounds after shifting into a gear mine only does it some times not always

 

It is the slop in the engine/tranny mounts. It is your engine/tranny flopping around.

Check out the TTR Upper mount and STOP mounts, it will reduce this slop greatly!