iguess this is another noob question.. sorry everyone.

Just want to know what is the exact difference between the TT-01 and the TT-01D in terms of the chassis..

and i guess a more important question is how these difference affect how well the car would drift or even whether these differences are necessary? and in the case if they are necessary? how can one go about converting a TT-01 to TT-01D spec?

thanks for all the help.