Can somebody help me out. I have a AODE and I want to put in a shift kit and 3:73's. What are the best shift kits out there? Also I drive about 10 miles of highway driving every day. Are 3:73 a good option? And last the speed limits on the highway are 75 so I do about 80-85. What RPM do you think I will be running at that fast? Thanks for all the help.