Bought the ‘99 4Runner with 320k miles, so I knew it was going to need some work. After a ToyTec/SuperFlex lift w/ 5100’s, I started to get a lot of stability issues. New SPC UCA, new poly bushings (upper & lower on front, rear, & panhard bar), new steering gear bushings, used 2002 Tacoma steering gear, new CV’s, you name it and I replaced it.

I was also getting a vibration almost like a wheel out of balance and was starting to get a bearing noise. Suspected the front wheel bearing, so I replaced them. The stability problems were gone, but still had the vibration and noise.

Noise started around 25-30mph, vibration started to be noticeable around 60mph and was pronounced at 80. Heaving braking caused a vibration like a warped rotor, but since I had new pad & rotors (Tundra 199 upgrade) I figured it wasn’t that.

I read this thread, checked the Driver CV, and sure enough had a lot of play at the diff.

The video made sense with what I was experiencing, so I ordered the parts & puller and replaced the bearing with the bushing.

I’d say easy as that, but it was a bit of work!