only_sham

Whats up Fellas
i bought a 2000 mustang gt manual trans with a 98000 miles on it.and the past owner puts some performance parts in it such as BBK pulles,BBK cold air induction,aluminum driveshaft. but the problem is that the car got too much problems needed to be fixed. and here is the parts i replaced so far IAC,fuel filter,factory rubber pipe and air filter,fuel injectors rubber rings,spark plugs,cleaned the MAF Sensor.the car runs great and idles great too but i got one last problem..when i drive the car in the city(cruising mode) and after i reaches 1500 RPM the engine starts to make a very loud noise like a knocking noise or tapping noise but when i floor the pedal (WOT) i hear nothing and the noise disappear.only in cruiseing mode and its starts on 1500 till 6000 RPM and no signs of detonation no oil burning or white smoke or high temp.PLEASE HELPPPPPPPPPP

Here is a video link if this helps
YouTube - mustang knocking noise

mojo46

I have much the same sounding noise in my '00 stang GT. In my case I believe its the pilot bearing. It can be seperated from a bad trans input shaft bearing by parking the car, in gear, clutch disengaged, raise rpms and snap throttle shut. The noise appears as rpms decrease thru a certain range. Since its in gear the input shaft is not turning therefor can't be the input shaft bearing. Literally the input shaft nose is flopping around inside the crank.
Haven't pulled the trans yet, I'm going to park it for the rest of the winter.