I have a www.bieberfever.com stage 3 aod with lentech valve bodie, hardened input shaft, electronic overdrive delete switch, 2500 stall converter and it will support close to 400 rwhp. Never been to the track but I have no problems on the street. Manual shifting is much more fun and then in traffic you have drive and the overdrive switch for the freeway. It is much more fun then the stocker.