Yea you're probably thinking you took a 10 year old 132K mile truck to the dealer? Let me explain. Since I bought my truck I've had a small vibration and thumping/grinding noise between 30 to 40ish MPH. First though it was the old cracked Michelin tires that came on the truck. After replacing the tires it got better, but a month or so later I needed 4wd to get out of my yard (at the time it was raining inches at a time... it was a mess). After that the problem came back with vengeance! I seriously thought the new tires were junk (they still are, but that's another subject). Did some digging and found a thread on the Tacoma forum that had a TSB for the issue that the needle bearing for where the drivers side front CV axle goes into goes bad. Testing procedure has you driving strait at the effected mileage and switch on 4wd, if the noise/grinding goes away replace the bearing. Yup, problem went away. There's a company that makes an upgraded part (bushing sleeve instead of a new needle bearing) and install kit, but honestly it was something I didn't want to get into. Talked to my local shop and they did not want to do it (pretty sure they just want to do gravy jobs nowadays...) so unfortunately for me it was off to a local dealer with TSB in hand printed out. They confirmed the issue and while they could have put a new needle bearing in, but they did not want to because the truck has a small lift. Dealer did not want to it fail a couple thousand miles later. They ordered the upgraded sleeve bushing and installed it. They charged a little over $100 for the part and 3 hours labor @ $120/hr. A little pricey, but the issue is now gone (hopefully for good) and drives/feels normal. I'm just glad someone there knew it was a known issue with the factory needle bearings. The first owner bought a differential drop kit, but never installed it. I have to wonder now if when he installed the leveling/lift kit the problem started. It was never installed as he said he had to get a different vehicle for the kids. I do not plan on installing this kit as it seems to be hit or miss with issues. Next issues at hand are the steering shaft joints and getting a solid rear driveshaft made, both aren't bad to fix though.