[supramacist]

Brakes: toyota oem rebuild kits for the front and back via your dealership.

Drivetrain: Niether one of those are inexpensive to replace dude.

Carrier bearings are priced sky high. A drive shaft could cost you a grand.
U-joints. I like to use spicer, but I haven't changed mine out yet either.

The good news is that with ramps and jack stands you can do all of the work yourself. Easily within a weekend.

I'm not totally sure what you have but you sound like this could be it and it just happens in autos such as vans and 3/4 ton trucks from the drive train hauling that weight. In your case it's probably there from years of negligence.

If I had to venture a guess. I would say the carrier bearing is close to $250/$300. And the other 2 u joints are going to run anywhere from $75 / $125.

If you have never ''wrestled'' u-joints before. You had better study up.
They can be a real pita unless someone knows the trick.

I have long since forgotten it, without some hands on.

I hope this helps, man.