none of the es2010l ends I came across came with a jam nut, the es2234r does however..
Maybe I should add this to a different thread for future reference, and help, but check this out!!
i am a part time autozoner and full time student.. depending on what it is, a few of our "house" brand duralast parts are actually made by different companies... Well me being the investigative autozoner that I am I discovered that Duralast es2010l and es2010r from autozone are actually moog parts! es2010l-$27.99, es2010R-$20.99. After ordering es2010l for myself (I wanted moog parts, but its easier for me to do crap from my own job) and opening the box, I thought my tie rod had been incorrectly packaged coming in a duralast box, because moog was stamped on the tie rod boot, and the tie rod was STOUT!! I then ordered myself es2010R today and recieved it, Duralast box, however no Moog stamped on the tie rod boot, but this tie rod end is Also STOUT! Flip it over, look at back side, FEDERAL Mogul on backside of tie rod. The maker of moog parts.. these are indeed moog parts for half the price..