My son has late 90's 220 and rear diff drain plug was loose and leaking. I drained fluid (very milky...water) and need to replace it. Does anyone know how much of what to put in? Thanks

 

Might have to find someone with a repair manual or the owner's manual for that one.

 

are you asking how much oil to put back in?

I think its marked on the case, right near the filler

 

I have a 96 220 on to of the case is a plastic bolt remove it and in the middle there is a little 10 mm bolt facing the left tire remove it and start filling. When the gear oil starts coming out of it put it back in and it full enough. I use 80/90 gear oil and when starts coming out I stop with that and put a little Lucas oil treatment after that.