You may have damaged the front pump of the trans when you reinstalled the trans. It is a very common thing to happen if you aren't aware the converter must line up one way. Now forget fixing it. The 98-99 trannys were junk anyway. 2000 to 2002 were upgraded. If you cant find one let me know, I can find you one. I sell used auto parts. Call me Dave Brauning Automotion (804) 224-1200. Mon-Fri.