Rear left wheels vibrating?

Sounds like the switch .

Needs a good washing under the axle area. Sounds like the mud dried and causing friction

I bought my 99 SR5 last march and battled the axle seals 3 times before I figured it out on the forth time. The FSM has the wrong measurement for the placement of the inner retainer. Also the retainer works better if you orient the bevel outboard instead of inboard. I have a write in www.tr4.org
http://www.toyota-4runner.org/3rd-gen-t4rs/114743-possible-solution-leaking-axle-seals.html

Hope this helps. It\'s hard to get right.

There is nothing to adjust on the rear because it is a solid axle, most dealers and alignment shops do a 4wheel alignment anyway and they don't charge less for a two wheel alignment. A 4wheel alignment also reveals any possible bent suspension components or frame misalignment..

if its rear drum brakes, you probably have a sticking wheel cylinder. or a brake adjuster that's adjusted too tight. If its four wheel disc brakes it's probably the emergency brake cable/ tension mechanism not releasing.

You need to remove the rear wheels and the rotor/drums. You will find your problem in the parking brake shoes. You will need to replace these.

fix same problem myself...these's' only 1 inner seal (differential output seal only-about 10$ each) that needs to be replace and new brake shoes (20$ part)..assumed u have rear drums and it leaked diff fluid on the brake shoes..but, i also replaced the brake cylinder (15$ part)-u have to disconnect brake cylinder to remove axle..look on internet for procedures..http://www.yotatech.com/f128/replacing-rear-axle-seals-3rd-gen-4runner-76339/..hope this helps..all dealers are ripoffs-worked at toyota for a year

solenoid on the gbox needs to be checked out.

just fixed one myself. replace rear output shaft seal on transfer case.

jack & support vehicle. remove rear axle cover drain fluid, removeleft rear tire drum/rotor brakes, remove bolt in axle housing that holds the 3/4 inch pin in place pull pin , push left axle shaft inwards and remove c clip from inside axle case,slide out axle shaft,remove seal,remove bearing and install in revers