okay i know i already posted this before but i labeled the subject wrong so here it is again. when shifting from 2hi to 4hi, are you supposed to be gassing it (as long as your under 25 mph) or just letting the car move with the built up force. also i get a rattling noise coming from the drive shift lever. i know i unlocked the 'hubs', because i did here the clicking noise when i drove in reverse. is the rattling normal or is somethin wrong?