I assume that the gear oil leak (from a probable front trans seal problem) has contaminated the clutch friction surfaces and is causing the chatter.
Time to take the vehicle back to whomever attempted the clutch change-out.
'99 Grand Vitara JLX, 2.5L V-6, 4WD, 5 spd std, '00 "Limited" leather interior.
'53 Chevy 3100 Pick-up w/327 SB, TH400 trans w/78' Nova rear end.
'03 Honda Odyssey (Momma's ride)
'72 Chevy Nova. One owner, SB, A/C, power disc/drum & steering.