I have a 94 J30 and the transmission is rough shifting from 1st to second. It also feels like it is shifting back and fourth from 3rd to 4th gear on the highway for no reason sometimes. I had the fluid flushed and new filters put in and two weeks later the fluid smelled and it was dirty. The mech. said that there was metal in the tranny and it was going to have more problems. Can anyone tell me if they think it needs to be replaced? If so how much? Thanks