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Thread: Rear Differential Fluid Change.
06-10-2013, 01:56 AM #1
Rear Differential Fluid Change.
Changed the fluid in the rear differential. The amount of fluid that I removed was ~2.25 quarts, and the fluid I put back in was ~3.25 quarts. I put fluid in until it ran out the fill plug. I wonder why the difference?
Used Mobil 1 75W-90 gear oil.
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06-10-2013, 07:14 AM #2
since you drained out A QT less then you must have a leak. check the fluid every oil change for level and fluid color.
06-10-2013, 08:34 AM #3
Could be as simple as the position of the asymmetrical center section...turn it one way and it will displace more volume than if its turned 90*. Depending on its position when it was last filled...
A leak on a differential should show up pretty readily. Even an ounce will make a complete mess underneath a truck; let alone a quart.
06-10-2013, 12:42 PM #4
06-10-2013, 12:51 PM #5
I want to say mine was "low" by my standards when I brought it home...it was around a 1/2 inch (or more) below the fill hole. I'm thinking they probably fill them by volume (automated, so to speak), and not by level...I fill this one to where the fluid runs out the fill hole.
06-10-2013, 12:52 PM #6
After reading a BUNCH of posts on other forums I gather the capacity of that particular diff is ~2.5 quarts. Many have said that the proper fill level is 0.5" below the fill plug.
I filled the diff up until it came running out of the fill plug and waited for it to stop running out. Is this improper, I don't know, I've always filled gearboxes up until the fluid came running out of the fill plug.
06-10-2013, 12:56 PM #7
I have a 10.5", and I want to remember the 10.5" is "level with the fill hole"; but I do know it depends on the differential.
06-10-2013, 01:05 PM #8
06-10-2013, 01:15 PM #9
The only Dana I know that GM used in a rear application was the Dana 60 in some of the 3/4 ton vans a while back. Until they switched to IFS, they used the D44 (later replaced by the Corp 10-bolt) and D60 for the front axle.
This 10.5 is what i know as a "Corporate 14-bolt", and its design has been in use by GM since the late 60s/early 70s.
06-10-2013, 01:44 PM #10
Before this thread gets too far off topic:
I would like the opinion of some of the forum members as do they think that filling G80 8.6" differential on a 2013 SIlverado up to the fill plug is bad, good, does not matter?
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