Jim-I really appreciate the information that you provided. By the way, I have an automatic transmission on my 2000 honda accord. I found the 3/8" square socket hole that you mentioned. However, I guess when I had the transmission oil change performed at the dealership- they tightened soo tight that it's unable to budge. I've had 3 of my buddies go underneath and each of them could not loosen that nut. I tried using DW40 to try to loosen the drain nut and also waited till the car engine cooled. I could not unloosen it. Any suggestions???