Ogre

I've got a 96 GT convertible with a 4R70W auto transmission. Did a Mark VIII swap with a 97 4V. The only other thing I've done was add long tube headers and custom exhaust system when I did the engine swap.

So my question is what is the best way to tune this combo? Does anyone make a tuner or tunes for this swap? Or will I just have to take it to a place that will dyno it and write a custom tune?

Thanks!