Car runs and moves when key is on and in drive, what could that be??

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Also , sometimes when going over little hills , on country roads , usually over 75-80 MPH , it will fee like it is going air-born and thump sometimes. Motor will only red-line when I put it in 1st gear (auto trans) manually and even then , it will only go up to 6500 rpms I can hold it there for miles , and it will not blow up ? What could be the problem???? Also the transmission ring gear has about a half inch of free-play (pulled cover off to inspect 2 years/100,000 miles ago) makes loud knock if it up-shifts while coasting. No matter what I do I cannot get it to fall apart??? What do you suggest??? Pass. side axle has been popping for about 65,000 miles , boot is broken , no grease , what should I do I can't pull it apart unless it breaks! HELP!!!