does antone know how to rest the speedo when i put the 36s on in knock my speedo off abot 15 mph do i need to take it to a shop or can me and my dad do(we should have the things to do it we put my lift on and changed motor from a 302 to a 351 and put mods on ourself and we have a pretty good size farm operation) please help geting tired of lookin at gps