I have a 2003 toyota tundra sr5 trd off road package v8. I am currently trying to sell it, the only problem is many people only want a 4wd. But i dont know if my truck is 2wd or 4wd. How do i check this to make sure? . the gearshift only says P R N D 2 1 . i couldnt find a switch for 4wd either...