Any B-Body guys on the forum? Basically, the car is running an open diff with a 2.97 rear end ratio on it. In the 1/4 mile, it laid down a 15.0 @ 93MPH. The transmission i noticed tends to acts like a power glide. Holds first and second all the way almost through the 1/4 mile. Shifts into third a little before the traps, and the engine is just basically loafing its way at about 3000 RPMs. So what feasibly, would I be looking at with a 3.73 gearing and a posi trac? I talked to a few ford guys, and the told me not to expect anything more then maybe .2 tenths. However, I have a feeling that the car is more capable then that, and I wouldn't be surprised if the car dropped almost a whole second from gearing. BTW, the car is a 1995 Buick Roadmaster.