07musclemustang

well you DONT check the factory oil because you "break the seal" and can void the warranty on the rear. If the factory rear gears fail its covered under warranty

gman73

It's wasn't the factory oil. I had 4.10s installed about 6 months ago and the installer, although did a good job on the install, didn't use a quality gear oil.

SaddleUp

Off subject kinda...but I have had so many people looking at my gears lately I bet I have had at least three gear oil changes since the gears were installed.....talk about "super lubed".....

gman73

I was reading your thread about your gear issue. Was it ever resolved or do you need to buy new gears?

SaddleUp

I guess you could say it has "partially" been resolved....the dealer is ordering new gears--which I have to pay for--, but is installing them for no charge. I am also supposed to get a 12K warranty on these new gears.....so we shall see.

Blue07GT

Thats just pointless to change the fluid that early. I had my gear changed at 6k with mobil 1 fluid, and i wont change it agian for atleast 30-40k.

I aslo do 4k mile oil changes to, and use Valvoline synpower and Motorcraft filters.

gman73

I wanted a better quality gear oil then what I had in it. Besides I had over 10K miles on these gears. These guys have been doing gears and axles for over 20 yrs, so I do trust their judgment. The gear oil should be good for another 30-40K.