Product review (5 stars): If you pick the right seller, you can get a real OEM.
If your LG washing machine starts making strange sounds like grinding during the drain cycles, DON'T WAIT. Get a new pump today and keep it because the washer is soon (within two weeks in our case) going to poop out and give you the "OE" code. When that happens, you'll have the pump on hand instead of having to wait days for it to arrive.

Be careful of the seller or you run the risk of getting a non OEM part. While the price varies, I paid about $9 more and picked Amazon itself as the seller versus any of the other "fulfilled by Amazon" orders which are a grab bag of vendors. Mine appears to be a true LG OEM part.

The best repair guide can be found on YouTube under the title "Washing Machine Repair - Replacing the Drain Pump (LG Part # 4681EA2001T)." That's the video I followed and it took about an hour total. The hardest part is replacing the rubber drain collar around the door. Once you get that, it's game on.

A few tips:
Save all the screws and put them back into the same hole you removed them from. For instance, when you take the front off, put the loose screw back a just a few turns into its hole. There's about a dozen screws, all different, and all hard to tell apart once they're jumbled up.

Make sure you clean all the parts you've removed. The washer gets a lot of scale, funk, fumunda cheese, etc. in all the internals. It's nasty. That soap tray...hot mess to clean it out especially in the far back.

The attached pictures are the box my part came in.