I just regeared my truck with 4.56's and now my Attitude monitor shows I'm doing 90 mph and around 70-75 mph. What tire size should I set the display at to get close to true mph? I am running 40" Toyo M/T's any help would be greatly appreciated. BTW I now have my ABS light on I have heard the Hypertech will remove this is this true or not? I will do a search as I sure my question has already been answered, thanks for your help!

you should set it at about 2600cm to get the correct speed

Thanks I will have to try that tonight when I get home, everyone agree?