I'm impressed, Nisha J! You know more than than I do, shame on me.
I personally think 2D1N would be too rush. I've been to Taman Negara few years back and I spent 3D2N there, but even that I felt it was not sufficient.
Information you might be interested!
Daily departure from Hotel Malaya, Chinatown at 8am. Cost RM30
The bus makes one stop in Mentakab Mobil petrol station for about 10 minutes and then straight to Jerantut town.
2 choices, bus to Taman Negara (1 & 1/2 hours) or long boat ride from Kuala Tembelling Jetty (3 hours)