Try a sawzall right through the middle of the nut and stud.

Or a cut-off wheel in an angle/die grinder. If you do not have one you can rent one for a couple bucks. You can put a cut-off wheel on your drill too. That would easily cut through the whole mess and your cotter pin will no longer be part of the truck. Leaving part of a nut and a very short stud.


2000 Ext Cab SR5 4WD 2.7L 5-speed.