Ok, I have to replace the rearend because its a 7.5. I'm getting an 8.8, and I'm installing axles, and Auburn, but what gears should I get? Its a supercharged 342 so it makes plenty of power. I like the idea of having a crazy high topspeed, but I'm also going to be drag racing alot. I dont think I need a lot of gear due to the current engine setup. I'm thinking of getting 3.23's. Alot of you may think that is high, but again I want to be able to run with all the fast cars on the highway, and the Tremecs have a pretty good first gear to help pull off the line. My overdrive is .68, so that with high gears could give me a top speed over 150mph.