Thump when shifting
I have a 1994 Trans Am LT1 engine with 4L60E automatic transmission. A while back I was taking a turn from a stop at a decent acceleration and wham! all the sudden it felt like I went over a speed bump. I had my sister look at it and determined it was a bad transmission mount. So, I replaced it and shortly after it happened again. Sister checked again and same problem. I upgraded to the aftermarket (polyurathane I think) transmission mount and still does it. I am now somewhat savvy with my car now and checked and it is fine and installed correctly, however, whenever I add any gas whatsoever passed a easy shift it feels like I went over a speed bump and feels like it's coming from the shifter area. Is there anything that would cause this other than transmission mount? Like torque converter or something? Or is my transmission just screwed and need a rebuild? Any help would be appreciated.