Did some research on the available speedo gears for the 80 to correct for bigger tires and or gears. I recently installed a Slee 31 gear tooth to correct for 285/75 BFG tires. My next upgrade I want to do is install 4.56 gears. I found a gear part number 33403-69245 that is a 33 tooth gear that I think will slow the speedo down enough to correct. I know the stock gear is a 32 tooth. Anyone else use this 33 tooth gear with a 4.56 and 285 series tire combo? Looks like it will be really close to accurate. I don't really want to use an electronic adaptor . I tried one of those on a Mustang awhile back and had nothing but problems with the unit.