Need help guys. My 2000 trooper transmission is down. It is 4x4 with 220k. It started by jumping out of gear occasionally, if you let of the gas it would re- engage and be fine. Then it got worse, now it is slow to engage, then it will not shift from first to second, if feels like it's going into neutral. Changed fluid(that's a pain) but no improvement. My question is... is my transmission **** or are there other possible causes?