I am just about ready to swap out my 7.5 open rear for a Trac-lok 8.8 rear. What gear lube should use? I have heard about Redline, but really dont know anything about how to select the best oil or how weight affects the performance. The car is a daily driver. It will have 2.73 gears for now, however later this year, I will be changing to 3.73 gears. I need to hold off on a gear swap until I increase the overall tire size, latter this year. It probably will not be doing any kind of drag racing, except a occasional launch onto the highway. I understand that I have to use an additive in the rear, since its a posi. What exactly is the posi lube stuff supposed to do that a quality lube wont? Thanks for info in advance.