Thanks for all the info. I called around yesterday to a few guys that sell performace parts for the A518 to find out what if any parts are interchangeable. I was told by SMR transmission that they are seeing up to a second and a half when changing from the A518 to the 727. The guy I talked to said it was because of the extra weight and the extra drag from the overdrive. I don't see how you would see that much change. I probably will just look into the gear vendors anyways.