Every once and a while my 95 makes what I used to think was a clunk but it did it today and it sounded more like a backfire through the TB. Sounded the same as when my k5 backfires through the carb I felt. It happened on the shift from first to second and this is when I ever hear it. I'm worried its coming from my trans(I have autos so much). The truck seemed liek it picked up pretty good, better than usual, then right after I had that thought it shifted and I heard it. Anyone have ideas?