So i took my rear diff cover because it has no drain plug and i wanted to see what it looked like in there anyway. I didnt figure the oil would look good but at least it was still oil in stead of gunk. But it was green yellow and black. Still little greasy tho whats can i clean it out with. I have a gal of purple power degreaser i can wash it out with. Also wondering whatoil i should use. I read that 80w90 is what i should use. It has 3 55 gears and is limited slip. I know if i dont get the synthetic i need the friction additive. What is that called. And i do tow a little bit

 

You answered every single one of your own questions! Lol

 

Ahh, the wonderful smell of old *** nasty diff oil.

My garage smelled like that stuff for 2 weeks after I swapped out the diff oil in my old 93 F150 and pretty sure it hadn't been done in at least a decade or so.

 

Haha wonderful

Ya the oil didnt smell to bad actualy. Idk if its original or not i think it might be worse if it was and there wasnt any gasket left either.

 

How much oil do you need ? Im planning on doing mine this weekend

 

I think 3 qts but not sure

 

use 80w90, and you still have to use limited slip additive whether you use conventional oil or synthetic. just buy a bottle they are just a few OZ's put the whole bottle in.

 

Whats it called and from other posts have said you dont gotta ad it if you use synthetic

 

It's called friction modifier.

 

Ok