I've got a 2005 GTP without Tapshift and i've recently started having an issue that i'm guessing is the tranny. Every so often when i accelerate from a stop, if i accelerate hard, the car will move slightly and jump forward, then it will shift into second a few seconds later. I'm guessing its the first band, but i dont know these trannys 100% so any advice would be appreciated, thanks in advance everyone.