Just got my car back today after 3 weeks of back and forth with the dealer getting warranty work done. Have a new transmission, clutch, flywheel, pressure plate, throwoff bearing, and some other things. Since I got it back, everything seems great with the transmission, except for this chattering noise I hear when starting off without enough throttle (slowly driving into the garage, and starting from a stop). The dealer told me that I just need to gas it more when I am starting, but it didn't seem like it was quite this loud before I got all the work done.

Is this something normal? My car is the only manual mustang I've driven, so I have nothing to compare the noise to. Clutch has about 200 miles on it, tranny has about 40