Rear Differential Help???

I am changing the oil in my rear differential, is regular 75-90 gear oil alright with the lsd additive?

 

Thanks!

 

I have another quick question. How full should the rear diff. be? I filled mine to the bottom of the fill hole and it didn't hardly hold the full three quarts.

 

only put it what your diff.. requires...no more.......

 

thats right.

 

The manual says 3 quarts, but mine wouldnt hold it, maybe because i added the lsd additive.

 

bingo

 

So i should be alright just filling it till it starts to run out the fill hole?

 

yes

 

Thanks guys, yall are a big help!

 

i quit when it started to trickle out, waited for it to settle, then topped it off and replaced the fill plug

 

Do I need lsd additive/friction modifier for my 2010 Sport? I think that is only for a mechanical lsd.