If you did your research, you already know that this bearing comes preassembled and ready to go. The cheap crap ones you see for much less require special equipment and extra steps, which is great for professionals. However, if you are basic do it yourself-er, trying to save some money... this is a great choice. My experience level is beginner. I have changed brake pads, performed basic maintenance, but for the most part I learn from YouTube videos. If I am describing you, this is probably the product you want.I installed on a 2008 Toyota Tacoma Pre-Runner, 2-wheel drive (rear), Double Cab.Why did I choose amazon over other slightly cheaper vendors like RockAuto? Easy... two day shipping, and a great return policy. I diagnosed the problem for my truck based on sound alone. 1. It sounded like an airplane taking off 2. It went away when turning right 3. It didn't go away when I threw it in neutral 4. It sounded like it was coming from one side of the vehicleBecause the sound went away when turning right, all of the chatter on the internet said it was the right front tire, and the rationale was that the weight shifted off the right to the left side.I also checked each side for "play" which there was none.And finally internet advice said to change both at the same time, or if you change one side and it doesn't work, swap the other side.All of this advice is good, most of the time. The noise sounded louder from the left front tire... but the internet advice on taking a right turn said right. I changed the right front wheel bearing, it didn't work, and I used the old wheel bearing I took off the right, and installed it on the left, and it worked great. So here is the advice:1. Sounds like an airplane taking off.2. It doesn't stop in neutral.3. The noise changes pitch based on speed.4. You turn one direction and it stops (most of the time, and the rule one which direction you turn isn't always right for choosing which side is bad).5. You jack it up, and check for play left and right, up and down... and it wiggles (some of the time, mine had none).6. You may or may not have uneven tread wear.7. You may or may not have worse gas mileage.8. You may or may not have problems turning sharply (as opposed to dull).My advice is to order bearings that can be returned, are assembled and ready to go, and change our both of them. If you are on a right budget, change the side where the noise is the loudest (ignore the rule about the noise stopping turning one direaction. Finally, do your research and then trust your instinct. If your truck is at 140,000 miles, never required any maintenance besides tires, brakes, and a battery... and the YouTube videos describe your problem... get all the right parts and tools, do it safely, and get a part with a return policy. You may save you Self a bunch of money, learn something, and enjoy your time out of the house. If it didn't work, return it in good conditIon, and all you lose was a little time, but at least you didn't lose a lot of money or get ripped off at the stealership.