96-98 svt tranny swap

Look into www.dandperformance.com They offer two types of 6 speeds. They have different ratios in the trans. Call them and see if they can answer your question on the 1/4 mile conerns you have.

I don't have one, but I have constantly heard that you may have to shift into 5th depending on the gear in the rear end and the ratios in the trans. They weigh more than a T45, the shifter sits further back so floor mods may be neccessary and you must move back the crossmember and shorten the driveshaft.