Trying to figure out the best route to go with for filling up my rear now that it's done. I have an 8.8 with a 31 spline traction lock and 410 gears. I'm not sure if I should go with the 75w90 or the 80w140. Car is about 50/50 street/strip. I've had people tell me both ways. I figure I'll see what you all say here. Thanks!