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  #1  
Old 09-22-2010, 12:16 PM
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Warm Rear Differential?

Sould my rear differential be warm? Its not hot, but it is warm to the touch. I've never thought about, but mine seems to be warm when I come back from a drive. Just one of those dumb questions!
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Old 09-22-2010, 12:17 PM
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bill.pounds.1
Warm is good. Even a little hot to the touch is okay. Completely normal. This is why they use a synthetic multi-vis oil.
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Old 09-22-2010, 12:32 PM
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OK, good! Just wanted to check. It just needs to hold in there for a month or so when I get it re-geared and can put my mind at ease.
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Old 09-22-2010, 12:38 PM
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There will be heat in the diff as there are moving parts and friction and also slipping of clutches around corners and whatnot.
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Old 09-22-2010, 12:46 PM
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You'd be warm to if you got thrashed around like that lube does between all those gears!
The amount of moving parts in the drivetrain is amazing.
The older I get the more amazed I am these trucks don't just blow up in a ball of flames!
I have a headache now.
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Old 09-22-2010, 02:46 PM
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Quote:
Originally Posted by rickf92592 View Post
You'd be warm to if you got thrashed around like that lube does between all those gears!
The amount of moving parts in the drivetrain is amazing.
The older I get the more amazed I am these trucks don't just blow up in a ball of flames!
I have a headache now.
I'm with you. I pulled apart a 5.0 Mustang motor a few years ago just for fun and I was amezed with the 1000s of pieces that make a car or truck run/move/not blow up.
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Old 09-22-2010, 03:09 PM
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yeah warm is ok. smoking is not ok like mine started doing. if youre worried about it check the level of fluid. just pull out the plug and start putting fluid into it till fluid starts coming out of the hole.
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Old 09-22-2010, 03:11 PM
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^^^

What he said. What kind of usage is the truck getting? Heavy towing all the time? What?
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Old 09-22-2010, 05:36 PM
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Already checked the fluid and it was perfect. Right to the top. Right now it is just getting regular daily driving, MAYBE upto 20 miles a day tops. In the spring it will be hauling my 7K pound race car trailer about 120 miles roundtrip once a week.
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Old 09-22-2010, 05:40 PM
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bill.pounds.1
If you have any concern, now would be a great time to change the fluid and install the Ford aluminum cover.
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Old 09-22-2010, 05:46 PM
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I might be doing that. I'll have to see how quick I can save my gear swap money. hopefully in the next two weeks it'll have some new gears (and a DP Tuner and gauges!).
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Old 09-22-2010, 06:10 PM
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Being a data loving techno-geek, I stuck a temperature sensor in there. Modern differentials use hypoid gears, which have a "sliding" interaction, which shears the oil and generates heat.

Normal driving, minimal load: Rarely more than 50 degrees over ambient.

Towing: Usually 50 to 100 degrees over ambient

Grinding up long grades (20+ minutes) with heavy loads: I've seen 150 over ambient. 255 on a 105 degree day.... That's pretty stinkin' hot, and I don't recommend the touch test!

This is with Mag-Hytek cover and Redline 75W140 synthetic.
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Old 09-22-2010, 07:07 PM
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rear ends get really hot sprint cup cars have an pump cooler and fan to cool the oil
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Old 09-22-2010, 08:55 PM
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I might have to put a gauge on mine some day. That would be a cool feature to have.
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Old 09-22-2010, 09:05 PM
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Quote:
Originally Posted by cdrmotorsports View Post
I might have to put a gauge on mine some day. That would be a cool feature to have.
I have a feeling the wheels in your sig don't help either. A Mag-Hytec cover or Ford Aluminum would be good for you. The Mag-Hytec actually has extended capacity along with a dipstick, a top fill port, and a bottom drain plug.
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Old 09-22-2010, 09:05 PM
 
 
 
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