New clutch with intermittent driveline vibration

So just installed an lc engineering clutch in my 07 tacoma 2.7 5 speed 4x4, new carrier bearing new u joints all that. experiencing a driveline vibration through the whole truck. checked everywhere in the driveline with no issues i can see, all in phase etc. but in low rpm (about 2k) in 4th gear especially from 40-44 mph there’s an obvious vibration. sometimes in low rpm in 3rd and 5th i feel it as well. if i shift a little bit more aggressively (25-3500rpm) the vibration is non existent. anybody else had this issue, or any ideas?