99Warbird

My car has a 3200 stall and 410 gear. This is the first car i have had with a stall in it and was wondering if it causes any vibration in the car. I get this vibration around 2500 rpmn but i give it some gas and once i get passed 2900 rpm it goes away. i was just wondering if this might be caused by the stall, feels like its coming from underneath the car, not the engine. Or could it be something else and if so what should I be looking for.