I changed the oil on the rear diff (to Mobil 1 Syn. 75w-90) and it has a funky drain plug that grabs the inside of the hole and then it sandwiches together when you tighten it. I went onto myisuzuparts.com and found that it is actually a metal drain plug that is 16 x 12.5 but does not designate a thread pitch. Has anyone had to replace one and knows the thread pitch? If so, is it a local hardware/bolt store or Merlin? I do not know why the previous owner had this other weird drain plug on and it looks like the threads on the rear diff housing are OK. Thanks for any feedback!
Larry
99 A. Silver