Well, I got my 3.73's installed on Wednesday and I ordered a Bamachips custom tune to take into account my mods and the 3.73's. For some reason, I think it's mainly my paranoia, but I'm not sure if the speedo is reading right. When I was coming home from work I was going 70mph(according to my speedo) and was still getting passed. Maybe people were in a hurry. But - would someone with an automatic and with 3.73's be able to tell me what RPM you hit 45mph and 60mph at? Maybe I'm just retarded and it is right - as I was following behind a few people that I "thought" were doing the speed limit. PLEASE HELP ME!