I am thinking of converting my stock TF 1500 to the T9 5 speed transmission and changing the rear to a 4.55. I have heard that doing this is not a wise idea. That it is better to do one or the other but not both. Apparently the new gear ratios in both the trans and the rear leave the car unable to get out its own way (there is not enough torque in the engine). Has anyone done both conversions? if so do you find the car's acceleration better or worse than stock? If anyone is wondering why I want to do this --- it is because I want to have both good acceleration and lower RPM's in the higher speeds (around 45 to 60 MPH). Now if there is a better solution to my objective I'd like to hear that too. I am open to all opinions. Thanks