Thread: 98 gtp jumping in and out of od!

Just picked up this gtp on a good deal.Here is the issue.Took it for a test drive.3rd takes a little long to shift.4th hopes in and out.So i did a filter and trans fluid change.The oil was very dark almost like engine oil.took it out for a drive problems was gone.just a little slow in shifting 3rd tho.A day later same issues are back. For got to mention it slips nows.