Front differential fluid additive?

[RSG]

I am changing out the front differential fluid. Mobil 1 synthetic was $9/quart, whereas Royal Purple was $18-$20/quart at 2 different stores this weekend (both 75w90). So I bought the Mobil 1.

Do I need a friction additive like in the rear differential?

 

[atk]

No, unless you have a limited slip(posi) in the front diff....

 

[RSG]

Uh, ok. Do I!!?? Seriously, the owners manual doesn't even give a spec on the gear oil..

 

[commanderjjones]

Uh, ok. Do I!!?? Seriously, the owners manual doesn't even give a spec on the gear oil..

I've never seen a L/S in a factory front diff'.....don't think you can even order it that way (or I would've gotten one).

 

[DaveBen]

L/S in the front end makes for very hard steering when in four wheel drive. We used them on our Jeeps and I really liked it in the Rubicon, but not on the street. I would never have front L/S on any street vehicle. We drive on the street and not the Rubicon.

Dave

 

[atk]

Uh, ok. Do I!!?? Seriously, the owners manual doesn't even give a spec on the gear oil..

you probaly dfon`t have L/S diff, unless someone put an after market unit in....75w90 gear oil will be fine....