Rear End Oil Capacity?

[391dman]

I'm gonna try out changing the oil and putting in some additive in my rear end cause im tired of the one leggers. Anyone know what the oil capacity on the 10.5's are??

[Cory S]

bump i need to kmow this also

[wingnut]

im told its 6.9 pints, BUT...

i put the 08 cover on and couldnt get anymore than 3 quarts in

[wsigo]

Also, the more additive you put in there, the more the clutches will slip. Are you sure you have a limited slip diff? There is a tag on one of the rear cover bolts with some codes. Say you have a 3.73 ratio, the tag will read 3L.73 or something like that. The "L" means limited slip. If there isn't an L than you have an open differential, thus requiring NO additive. I had rear end service at Ford and they put additive in and charged me $25 for it- even though mine is open.

[391dman]

Already checked the tags and the axle code on my door jam, its got limited slip. Just been reading that Ford puts way too much additive in the rear ends so I was gonna try out a little less additive.

[wingnut]

yep...some suggest putting in 1/2 of the recomended amount and listen for chatter.

if it does add an ounce at a time until the chatter goes away.

[391dman]

I was talking about how much gear oil to put in. I'm gonna start with 2 oz of additive and add if needed.

[wingnut]

Originally Posted by 391dman

I was talking about how much gear oil to put in. I'm gonna start with 2 oz of additive and add if needed.

yep...post #3...6.9 pints

[J.R.]

just looked at my rear cover tags, it says 75w140 synthetic, and the other tag # starts with a "L" so I'm assuming limited slip. Is this the weight oil you'll are using, and synthetic???

[PolarBear]

Yes that is the correct weight and yes use synthetic. Did mine in December with Royal Purple.