on my 96 I had a leak at the top corner of the rear window seal. There is a channel that runs down the top of the roof that rolls over the back and towards the rear window. This channel funneled the water right to that part of the seal and it ran into the cab ruining my carpet. What a joke! Have a truck that is older than me (25yrs) That has never had a leak one! I feel your frustration. Hope this helps!