Rear diff temps???
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Postmaster
Joined: Jul 2006
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From: Bend, OR
Rear diff temps???
Weird...
Since I had the rear end rebuilt I have not changed the fluid. Should have but just didn't have the time or gumption to do it. Finally did it a few weeks ago before heading down to Las Vegas...
Before changing the fluid I would regularly see temps in the 180-200* range. They would stop there but I have seen temps as high as 230*...
I changed the fluid and installed Shaffers fluid. Now given its winter, and even here in Vegas its only in the 70's, but I have yet to see the temp move above 100*.
I'm going to pull the wires to the sensor and dip a new sensor in hot water to make sure the gauge is getting the communication, and if that works I will replace the sensor, but is it possible that the temps would drop that much with a good quality fluid?
Were talking 100* drop or better?
Since I had the rear end rebuilt I have not changed the fluid. Should have but just didn't have the time or gumption to do it. Finally did it a few weeks ago before heading down to Las Vegas...
Before changing the fluid I would regularly see temps in the 180-200* range. They would stop there but I have seen temps as high as 230*...
I changed the fluid and installed Shaffers fluid. Now given its winter, and even here in Vegas its only in the 70's, but I have yet to see the temp move above 100*.
I'm going to pull the wires to the sensor and dip a new sensor in hot water to make sure the gauge is getting the communication, and if that works I will replace the sensor, but is it possible that the temps would drop that much with a good quality fluid?
Were talking 100* drop or better?
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
Joe,
I don't have diff temp gauges on any of my trucks but I have shot the temps with an IR gun after driving down the highway. My wifes's F250 with 3.73 gears had an external housing temp of 140 degrees with OEM fluid. My F250 with 3.73 gears and Royal Purple was about 136 degrees and my F450 with 4.56 and Schaeffers oil was about 138 degrees. (No towing involved)
Seems like the temps are about the same for the various brands.
I don't have diff temp gauges on any of my trucks but I have shot the temps with an IR gun after driving down the highway. My wifes's F250 with 3.73 gears had an external housing temp of 140 degrees with OEM fluid. My F250 with 3.73 gears and Royal Purple was about 136 degrees and my F450 with 4.56 and Schaeffers oil was about 138 degrees. (No towing involved)
Seems like the temps are about the same for the various brands.
Last edited by Shake-N-Bake; Feb 1, 2012 at 10:22 AM. Reason: spelling
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
I'm sure your Diff oil made a difference but not 100 degree's. My neighbor went from ford fuild to amoil and it made a big difference when towing up hills with his 38 foot toy hauler. What it did was drop the temp down quicker when you toped the hill. Where the ford oil would stay hot for a much longer period of time. Don't remember his temps but he has guages on everything.
Chet
Chet
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Joined: May 2004
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From: Central Coast of CA
Since the rear was rebuilt, could the newly rebuilt diff be set up with a more efficient backlash, thereby creating less friction induced heat?
Maybe coupled with the fresh oil.......I dunno....throwing pasta against the wall here.
Stewart
Maybe coupled with the fresh oil.......I dunno....throwing pasta against the wall here.
Stewart
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Elder User
Joined: Feb 2006
Posts: 765
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From: Eastern Ohio
I've never seen temp's on a 10.5, but I've watched axle temp's on heavy trucks for over a million miles. The temp's your seeing now seem about normal.
I would shoot the cover with an IR gun or use a meat thermometer through the fill plug to confirm the gauge, after seeing that big of a change, though.
I would shoot the cover with an IR gun or use a meat thermometer through the fill plug to confirm the gauge, after seeing that big of a change, though.
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Cargo Master
Joined: May 2010
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From: Snohomish, WA
I put in Amsoil a few years ago. Using a temp gun I see around 130-160 (empty/towing). I would think it probably has something to do with the lash of the gears. Obviously the fluid is quality too.
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Postmaster
Joined: Jul 2006
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From: Bend, OR
To be clear the rear end was rebuilt 2+ years ago, not just last week... I have not changed the fluid in those two years.
I did change it 3 weeks ago and that is when I noticed these temp differences.
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From: Central Coast of CA
Stewart
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Postmaster
Joined: Jul 2006
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From: Bend, OR
Come to think of it... I also updated my gauges at the same time...
Hummmm need to check and see if I have a spare rear diff gauge, could be an issue that the gauge was not programed properly.
Hummmm need to check and see if I have a spare rear diff gauge, could be an issue that the gauge was not programed properly.
Posting Guru
Joined: Feb 2010
Posts: 1,411
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From: Opelika, AL
i see the same temps if gun...
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