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Old 11-02-2017, 11:04 PM   #15
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For what it's worth I shoot my differential with my IR gun every couple stops and it's always at about 165 degrees no matter what the ambient air temperature is.
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Old 11-02-2017, 11:37 PM   #16
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Quote:
Originally Posted by Arch Hoagland View Post
For what it's worth I shoot my differential with my IR gun every couple stops and it's always at about 165 degrees no matter what the ambient air temperature is.

Our coaches are simular. How many plugs do you have on your differential?
I have a drain plug plus two fill plugs. Im trying to find out which plug to pull to check the level.
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Old 11-03-2017, 07:22 AM   #17
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Our coaches are simular. How many plugs do you have on your differential?
I have a drain plug plus two fill plugs. Im trying to find out which plug to pull to check the level.
I am pretty sure your assessment they filled to the wrong hole is correct. I believe the lower one is correct. I think there are two, so if the axle is flipped over in a different application, there is oil level plug for that application!
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Old 11-03-2017, 08:18 AM   #18
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I am pretty sure your assessment they filled to the wrong hole is correct. I believe the lower one is correct. I think there are two, so if the axle is flipped over in a different application, there is oil level plug for that application!
I agree with this; seems to make sense based on the labeling. If you notice, the "FILL" designation is upside down on the upper plug. Use whichever plug reads correctly (right side up). That would be the lower one.
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Old 11-03-2017, 09:48 AM   #19
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I think you might be right. A picture is worth a thousand words.... My housing is much different - the fill plug is located on the axle housing - not on the third member or differential housing. I think the style I have is what most of us are thinking of when we talk about the number of plugs and location. I don't have any photos of mine handy - but here is a page out of the service manual that shows what I mean.
Its hard to tell from your photos - but as Mackwrench stated - the correct level will be about the height, or just slightly above the the bottom of the axle tube - so that lube flows out to the wheel bearings.
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Old 11-03-2017, 10:17 AM   #20
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If the problem is with something that was recently worked on ALWAYS go back and look at what was done. You will usually find the problem was poor maintenance. It is pretty obvious that speedco overfilled the differential.
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Old 11-03-2017, 01:03 PM   #21
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Our coaches are simular. How many plugs do you have on your differential?
I have a drain plug plus two fill plugs. Im trying to find out which plug to pull to check the level.
I have two plugs.

One at the very bottom...drain plug.

Another about a quarter of the way up from the bottom. That's all.
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Old 11-03-2017, 02:15 PM   #22
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I have two plugs.

One at the very bottom...drain plug.

Another about a quarter of the way up from the bottom. That's all.
I was hoping you had three :( thanks to the last few posts I am feeling confident that speedco filled it up to the second plug and this will be confirmed when I remove the top plug and see the fluid.

Thankyou to all the posters. You have helped me huge.
I will post my findings after I remove the plug this weekend.
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Old 11-03-2017, 02:31 PM   #23
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I agree with this; seems to make sense based on the labeling. If you notice, the "FILL" designation is upside down on the upper plug. Use whichever plug reads correctly (right side up). That would be the lower one.
Yes it is upside down.....good call! Thanks
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Old 11-03-2017, 05:42 PM   #24
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The lower plug on my Eaton is for temp sensor.
Just changed diff oil,called for 27 pints dead on at top plug
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Old 11-04-2017, 09:35 AM   #25
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The lower plug on my Eaton is for temp sensor.
Just changed diff oil,called for 27 pints dead on at top plug
But where is that top plug? Is it above the halfway point on the diff, or below?
The diagram that Kurt posted above shows two plugs, one for a sensor and one for fill, but they are both below the midway point. The two plugs on the OP's rig are not; one is below, one is above.
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Old 11-04-2017, 10:57 AM   #26
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Axle height on top plug
How do the wheel bearings get lubed if not
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Old 11-04-2017, 03:34 PM   #27
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Quote:
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Axle height on top plug
How do the wheel bearings get lubed if not
Top (or above) of the axle? OP 's diff has two plugs, both marked FILL (one marked upside down). The diagram posted later does NOT match the OP's diff (I'm assuming it more closely resembles yours?). The OP's lower one appears to be high enough to lube the axle/wheel bearings; the upper one is at a level that would be at the very top of the axle at least; too high, IMO.
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Old 11-05-2017, 08:35 AM   #28
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Here's a better pic to display the two fill plugs proximity to the axle. I dont know how to rotate the pic but you can see the axle to tell which way is up.
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