I just bought a 98 discovery and I think the tranny might be messed up. When it goes from 1st to 2nd it has a little boomerang and it is only in 1st for a second then 2nd it shifts good into 3rd but in high gear is seems to lug around in 3rd and then shift down into 4th like its bogged down. Is this just how these trucks are or do I have a problem? Will a full fluid and filter change fix this? Anyone had a similar issue?