Rear Differential Fluid ?

About to do my rear differential fluid change, and the only thing non synthetic I could find was the valvoline 75-90, I would of course use the additive for the limited slip (08 prerunner sport), just wanted to make sure or see if anyone experienced chirp with this combo, apparently the dealer dosent sell gear oil (economy in a drum is used in service department). Thanks guys.

 

That's what I'm running right now.

 

Just did mine last week and used the that very same oil. I did pick up the LSD additive from the dealer when i was there and its just a Ford LSD additive . works great

 

Great, yep the dealer gave me the ford stuff too, lol. Once it stops raining here I'll get to it. Thanks guys!