4runners have a tachometer which has a red line that you should not go beyond. We need the year and engine (4, 6, or 8 cylinder) to help with anything more specific. I assume you have an '08 from your sig but it's just a guess.:shrug:so last night i decided to go mudding and i got stuck. i couldnt get out in 4hi so i put in 4lo. i had the truck rev up to 5k in 4lo and i was wondering if this would do any damage?