Thats what i just did. Before i changed anything i turned on old Tx and measured all the control surfaces and noted them down on paper. What each was when in trim. and at max. Then changed over. had all new 2.4G TX and Rx. Every thing needed reprogrammed. Exp, end points. etc etc but when done rechecked the control surfaces to sub tim and they all flew great just a click here or thier of four planes.
Rich