GL-5 is the weight.

Look here:

http://www.vehicross.info/modules.ph...warticle&id=20

It's on page 0B-7 of the shop manual (page 22 of the pdf file).

When you go to drain the rear differential, you may need to 'plunge' the drain with a piece of wire or a zip tie (I had to on the front so assume you may run into the same issue on the rear). This is to move any debris out of the way so that the fluid can flow out.