Greg:
You really need to check out the last page of
this thread. One guy made a really durable looking hold down tool. If you don't want to make your own, get one from
Baum Tools; I believe they have them. When I did mine, there was no sign of Loctite from the factory. The dealer said it's torqued to 450 ft-lbs at the factory (mine is an ML). A 1/2 inch Ingersoll impact wrench did
not budge the bolt. You need a good hold down tool and a 5 foot cheater bar (4 feet is too short, really). Your Auto Zone socket will hold up just fine. I would reassemble with Loctite, however. The dealer said his guys torque it down to 250 ft-lbs and add a tug--like you and me, his guys don't have torque wrenches that can measure 450.
Do a search; most of your questions have already been answered on the above mentioned thread. Good luck!