What should Diff Temp be

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May 25, 2009 | 12:38 PM

#16

dt444e

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Joined: Nov 2004

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Just a reminder, assure you have the sending unit sealed good or you could have upscale readings during wet travel.

May 25, 2009 | 12:46 PM

#17

ernesteugene

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From: Fulltime RVer

Quote:

Originally Posted by Kwikkordead

Yeah, that IS hot.
About 100 degrees hotter than I would have guessed.

When I went fulltime RVing in 1999 I walked the RV parks and looked under a lot of pickups towing heavy 5ers and every one of them had blistered and peeling paint on their stock diff covers!

My Mag Hytec cover had a temp sensor fitting and I used that to piggy back to the single oil temp gauge that I used for the tranny and engine oil so I took a lot of diff temp data over the years. One surprise was that my diff got "hotter" going down a long mountain grade using my US Gear exhaust brake than it did towing up the grade!!! I think the "ring and pinion" gears generate a lot more "friction heat" when they're used to provide "reverse TQ"!

May 25, 2009 | 02:06 PM

#18

Ziggy.

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Joined: Feb 2009

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From: Blaine, TN

Quote:

Originally Posted by ernesteugene

Thats very interesting, I never thought of that. I wonder if it would be because the teeth would be running on the opposite side compared to "forward TQ".

Just a thought, but interesting non the less.

May 25, 2009 | 03:16 PM

#19

Izzy351

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Joined: Feb 2007

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From: Dallas-Ft. Worth

So what kind of temps did you see, Gene? I'm curious, but not enough to put in another sender...

May 26, 2009 | 03:57 PM

#20

ernesteugene

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Joined: Jun 2006

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From: Fulltime RVer

Quote:

Originally Posted by Izzy351

So what kind of temps did you see, Gene? I'm curious, but not enough to put in another sender...

You can use a "paste on" strip which turns different colors as a function of the maximum temperature it sees and use that as a "one time" measurement of diff temp.

The maximum I saw was 250 F but I had one of these... Ford #12-10.25 & 10.5 [Ford #12-10.25 & 10.5] - $260.00 : Mag-Hytec ...which holds 6 quarts and has deep cooling fins on the cover.

Towing flat at 65 mph with an AAT=80 F I saw about 180 F.