oil
You need 2.75 american pints or 1.3 liters.
I used 80w-90 gear oil designed for GL4 and GL5 applications. The differential is GL-5. Some people use 75w-90 for cooler climates. My oil was good for tranny ,too, but yours might not be as the tranny needs GL-4 oil.
(you could heat new oil with hot water so it flows easier)

(Note: if you have lsd, you need 1.5 liters)

Tools

-$10 fluid pump
-4 ft of 3/8 inch (inside diameter)clear tubing $4
-carb cleaner( to clean plug and surrounding area)
-1/2 inch ratchet wrench(you are sticking the .5 inch male adapter into the plug as it is an inny)(its actually .51 inches or 13mm so people tend to strip-maybe wrap thin cloth around socket)
-a long handle for ratchet for more leverage(if needed) or hammer
-container to collect old fluid
-high temp silicone for plugs

Procedure

Pretty easy. You dont need to jack car up as there is lots of room in back.
Some people try to gravity fill from the wheel well but I think the pump is much better idea. You can use pump for tranny oil change too.

1. Drive car around in gear to get the oil heated so it drains.
2. Park car in flat area. important
3.Loosen the fill plug first to make sure you can get it out to refill. You can access this from behind the driver side rear tire with 4 inch extention
4. Remove drain plug and drain fluid.
5. Replace drain plug.(after cleaning and silicone)
6. Stick clear tubing securely in fill hole.
7. Pump oil into fill hole until it starts to spill out of hole. (Try to use a clear container to pump from and measure out the 1.3 liters ahead of time. The spill method, however, is probably fine)
8.Replace fill plug.
9.Torque plugs to spec.

Torque specs : differential drain and fill plug: 29-43 ft lb

Pics of Differential courtesy Moulton712.Looking from back of vehicle towards front.

[/QUOTE]

Pics of my 1991 differential(I have HICAS and LSD so my drain plug is on the bottom) Click to enlarge.

filler plug

pump set-up(im going to use a clear plastic milk jug next time so i see what is happening)

$10 pump

Links

tech pages article on differential fluid change
http://www.nicoclub.com/articles.php?id=114085

changing differential with pics
http://forums.nicoclub.com/zerothread/217546

Tranny fluid change
http://forums.nicoclub.com/zer...87414

http://forums.nicoclub.com/zer...87414

Do you have LSD

You can tell by where the drain plug is. LSD has drain plug on bottom while normal differential has it on side.

DIFFERENTIAL CARRIER:
normal-(R200) 2-3/4 pints 1.3 liters
LSD-(R200V) 3-1/8 pints 1.5 liters

Modified by vancouverbc at 8:47 PM 12/30/2009

Modified by vancouverbc at 8:50 PM 12/30/2009

thank you.

I'm not so sure on that one. On my S14 the filler and drain is in the same place, I damn sure don't have VLSD.