To find the correct size, you should:
* Consult a Repair Manual: A factory service manual specific to your truck's year, make, and model will have the exact specifications.
* Check the Nut Itself: If you can safely access the nut without removing it completely, carefully look for markings stamped on the nut itself indicating its size.
* Visit a Parts Store: Take the nut to an auto parts store like AutoZone, NAPA, or Advance Auto Parts. They can identify the size using their tools and databases. (This is generally the easiest and safest method.)
Do not attempt to guess the size. Using the wrong size nut can lead to damage to the axle, wheel bearings, and other components, potentially causing serious accidents.
