Rattling Noise Also Wierd Noise From Transmission. on 2003 Nissan Altima

Week ago i have change the Inner and outer tie rod, driver front strut, passenger front and rear transmission mount but rattling noise still there even on small bumbs also just on service road, Mechanic told doing all this should make the noise go away, now i'm facing another noise when ever i start my car there's some kind loud noise i can hear from desk board sounds like transmission but when i open the hood i don't hear that noise, i ask the mechanic he told me sound like Timing Guide could be bad, it's goes away when i drive long period of time but when i restart the car it's come back. Any Suggestion.

Asked by for the 2003 Nissan Altima
It could be many things, unfortunately and without hearing the noise first hand or being able to do some basic diagnostic tests or be able to drive the car, its hard to say what the source of the noise may be. The exhaust flex pipe under the engine has problems with the heat shield rusting away, the catalytic converters fail and rattle. It's impossible to say what the noise is without hearing it first hand.