tonight i tried shifting into reverse and the lights came on and everything but the gear wouldnt go in!!!! every once in awhile it would grab and move me back a couple feet. when i got home i took a quick look underneath and there was sum black **** squirted on sum of the cat. conv. and sum around it. and if i saw right one of the rubber exhaust hangers looks cut. the auto trans. dip stick said i need to at one pint. Is that the whole problem?? i hope it is. thanx for n e help