Some 4kq related questions

[TM]

Hi listers,
A friend of mine just bought a VW Quantum Syncro last weekend.

Now I'm somewhat familiar with these cars- basically the same as
a 4kq.

Some questions:
Are there any differences in the drivetrain or engine from a 4kq?

Why does an '88 Quantum still have the pull-knob system for the
diff locks when the '85 4kq already went to the dial system?

What would cause the drivetrain (possibly the rear diff) to whine?

He's got some work to do:
Sticky clutch wants to stay down when depressed- possible bad clutch
slave cylinder?

Suspension is messed up- one tire has heavy uneven wear on the outside
shoulder.

Hydraulic fluid is low- does this car use the special G00 2000 or
does it take ATF? I assume it uses the special stuff. Wet return hose
as well as the pressurized hose to the rack, but the pump is dry.
Do these hoses go bad w/o the pump going? The pump is groaning rather
loudly, but that may be due to low PS fluid.

Car needs a tune up- cap, rotor, plugs and wires.

Thanks,
Taka