I have 1998 jeep wrangler with an automatic transmission. When in park it sounds as if it is grinding. Also makes a similar noise in neutral. But when in gear as far as drive or reverse it doesn't make any noises and seems to operate as should. I put it in neutral and wound it out and it really sounded terrible then. It sounds as though the transmission is trying to engage when in park or neutral. Any suggestions as to what could be the problem? It has adequate fluid in the transmission.