I've heard more noise from the front in all mine.

Quoted from silverback

Are all All-Tracs noisy? My 89 is not too quiet, especially the rear.

Try replacing the rear differential fluid with 100% synthetic gear oil; it should require 1.2 Liters to fill it up to
the filler hole.

Be sure to open the filler hole (top hole) first,before you drain the lower hole, just in case the top opening doesn't budge, you won't drain out all your differential and then can't add any more.

When you say, the rear, I assume you are referring to the rear differential.
You can quiet that gear box by using a synthetic gear oil with lower viscosity but being synthetic it should be able to hold up to all that stress.

Quoted from silverback

Are all All-Tracs noisy? My 89 is not too quiet, especially the rear.

Are you referring to the rear differential?  If so, consider checking the fluid level of the rear differential oil; if necessary clean out the rear differential with some sort of metal cleaner made for cars, e.g. Auto-Rx http://www.auto-rx.com, then drain the used gear oil, refill with a quality synthetic like Amsoil or Royal Purple.  The rear diff should run cooler and quieter.

If they are like the tercel wagons. Get your rear bearings checked as they start to howl when they go.  I've actually witnessed the axles leave the car while you are going doen the road if you don't get them fixed before they get too bad.
My younger brother got caught skipping school when it happened to him.

Quoted from oneman

If they are like the tercel wagons. Get your rear bearings checked as they start to howl when they go.  I've actually witnessed the axles leave the car while you are going doen the road if you don't get them fixed before they get too bad.
My younger brother got caught skipping school when it happened to him.

Agreed.  A growling noise from the rear is often due to worn outer rear axel bearings. I had to replace both of mine around 200k miles. These are sealed and aren't lubricated by the rear diff oil so changing the rear diff oil won't have any affect on them. They cost me about $8 bucks apiece from RockAuto and aren't hard to replace at all.

Quoted from scdevon

Agreed.  A growling noise from the rear is often due to worn outer rear axel bearings. I had to replace both of mine around 200k miles. These are sealed and aren't lubricated by the rear diff oil so changing the rear diff oil won't have any affect on them. They cost me about $8 bucks apiece from RockAuto and aren't hard to replace at all.

Nice to know.  My rear isn't that noisy, but I will check them out.