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Old 12-28-2010, 07:11 PM   #1
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Differential Oil Max Temperature

Anyone happen to know what a standard operating temperature should be for the gear oil in a rear Dana 44? I googled around online and haven't found anything specific except in racing applications and I don't think I'm turning out any quick lap times in my JK

I'm considering putting in a temp sensor in my rear diff for when I tow my boat during the summer but I don't know what the average safe maximum temperature would even be for gear oil, synthetic or dino.

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Old 12-28-2010, 07:33 PM   #2
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Did you notice the paint coming off of your diff. cover?
I don't have any infor for you but I did notice my paint came off and wondered whether it was due to temperature. I too pull a small trailer!
So far I haven't had any other problems with the stock Dana 44 with 4:10's. Hope that continues

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Old 12-28-2010, 07:36 PM   #3
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I am by no means an expert on towing or even the jeep thing, yet. But, is diff temp really a concern? I have never heard of it before or even thought a means of knowing was an option. Could be wrong, and would love to be educated since I plan on buying a boat.
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Old 12-28-2010, 07:36 PM   #4
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I don't think the paint is an issue. I have 54,000 on my JK now and I don't think there's any paint left on the entire axle. It's pretty normal for the axle and dif covers to look like crap after a few years unless you have an aftermarket dif cover.
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Old 12-28-2010, 07:41 PM   #5
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I tow through a lot of hills where I live in 100+ temps during the summer. Im towing approx 3400lbs and it really works the JK pretty hard even with 4.88 gears. If the rear gear oil gets too hot it will start to break down and begin providing reduced wear protection.

Mag-Hytec offers a pretty kewl add on diff cover that has a spot for a temp sending unit ==> Mag-Hytec This also has a plug in the bottom so I can drain the gear oil without pulling the cover and a dipstick on top to check the fluid level or to see if the fluid is scorched. The cover is also deeper and allows for 4 quarts of gear oil vs the 2 quarts with the stock cover. These are made of aluminum too and are designed to reduce the heat of the oil.

I found a temp sending unit/gauge combo online ==> Auto Meter Z-Series Series 2" Differential Temperature Gauge, 100-250`F, Single Sweep Electric 2636 just don't know what temperature is considered hot for gear oil. In auto transmissions 215F is pretty hot depending on the application and if you see temps like these often the ATF should be changed out more frequently. I'm just not sure about the gear oil though.
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Old 12-28-2010, 07:49 PM   #6
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Looking for something similar to this chart for auto trans temperatures Transmission temperature/failure chart.
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Old 12-28-2010, 07:56 PM   #7
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Well, 215° F for an auto/engine is standard op temp, the JK auto generally sees 300/350° F without aux cooler-and higher under continued load !!

The JK is rated at 2000lb towing max with 4,10 gears and the JKU-3500lbs max with 4.10 gears, I'm afraid you're outta the loop with 4.88 gears-and

The "flash" point of ATF-4 is 374° F for the auto !

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Old 12-28-2010, 08:04 PM   #8
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The original question is what is considered hot for gear oil, lets say 75w-140. Thanks once again for your insight as with a previous post. I don't have an auto JK so I have no idea what is hot for ATF in one of those. It was an example presented based on other vehicles I"ve owned and recommended oil flushes from the oil manufacturers themselves based on mileage and average operating temperature over the life of the oil. I've never killed an auto tranmission in any of my vehicles so to each his own on what you want to do.

http://www.roscommonequipmentcenter....notes/nn15.pdf
Read step 22 ==> http://project-jk.com/jeep-jk-write-...ission-service

I do however truly appreciate the folks on here who actually try to educate and offer help. Your signature doesn't match your replies.
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Old 12-28-2010, 09:23 PM   #9
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Don't worry, be happy !


Quote:
Originally Posted by Sierra8 View Post
The original question is what is considered hot for gear oil, lets say 75w-140. Thanks once again for your insight as with a previous post. I don't have an auto JK so I have no idea what is hot for ATF in one of those. It was an example presented based on other vehicles I"ve owned and recommended oil flushes from the oil manufacturers themselves based on mileage and average operating temperature over the life of the oil. I've never killed an auto tranmission in any of my vehicles so to each his own on what you want to do.

http://www.roscommonequipmentcenter....notes/nn15.pdf
Read step 22 ==> Project-JK.com - Jeep JK Wrangler Resource » Jeep JK Wrangler 42RLE Automatic Transmission Service

I do however truly appreciate the folks on here who actually try to educate and offer help. Your signature doesn't match your replies.
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Old 12-28-2010, 09:44 PM   #10
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75W-90 is the proper weight for the oil in the JK differentials.
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Old 12-28-2010, 09:49 PM   #11
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Yea Dag, but this is a different situation, but


Quote:
Originally Posted by daggo66 View Post
75W-90 is the proper weight for the oil in the JK differentials.
This guy already shut me out so, he'll figureitout !!

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Old 12-28-2010, 09:53 PM   #12
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For trailer towing, use MOPAR
Synthetic Gear & Axle Lubricant (SAE 75W-140) or equivalent. Models
equipped with Trac-Lok™ require an additive.

Owners manual.

Figured it out. Shutting you out has been easy. You're just wrong that's all.Trans temp at 374F. Awesome.
http://autos.yahoo.com/maintain/repa...ques123_0.html

Don't worry be happy...and wrong.

I take it this means no one that has responded knows a critical temperature for gear oil?
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Old 12-28-2010, 10:18 PM   #13
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I have read a lot of things in many different Jeep forums. I have never, ever heard anyone being concerned about the temperature of the oil in their differential.
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Old 12-28-2010, 10:24 PM   #14
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There is no reason why anyone makes dif covers that are aluminum and finned to remove heat from the oil or add additional fluid capacity. They make gauges to monitor temp for no reason. Some race cars have coolers for differentials for no reason. Because you've never seen a post it must not be a concern. The world must also be flat relative to what you've seen.

I take it being wrong about the gear oil in the 44 for towing applications caused some disturbance?

http://www.sciencedirect.com/science...8&searchtype=a

I take it this means no one that has responded knows a critical temperature for gear oil?
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Old 12-28-2010, 10:35 PM   #15
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Quote:
Originally Posted by Sierra8 View Post
I take it this means no one that has responded knows a critical temperature for gear oil?
Probably because its really not important...at all. If your differential is getting hot enough to cause the gear oil to break down that fast, something is very wrong. Follow the 'extreme duty' (or whatever they call it) maintenance schedule in your owner's manual and you'll be fine.

I've never known any stock vehicle to come with a differential temperature sensor (from diesel towing rigs to Ferrari track cars)...and I've never seen nor heard of any cars used for any kind of racing to use them either. I guarantee they're put under a lot more stress than your Jeep pulling what little it can (which is mostly limited by wheelbase and brakes...not drive train).

Max temp for Lucas 80W-90 gear oil is 450 degrees...probably the same for most gear oils.
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Old 12-28-2010, 10:38 PM   #16
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With your ASKING ATTITUDE, I'm sure that someone here is going to--


Quote:
Originally Posted by Sierra8 View Post
There is no reason why anyone makes dif covers that are aluminum and finned to remove heat from the oil or add additional fluid capacity. They make gauges to monitor temp for no reason. Some race cars have coolers for differentials for no reason. Because you've never seen a post it must not be a concern. The world must also be flat relative to what you've seen.

I take it being wrong about the gear oil in the 44 for towing applications caused some disturbance?

ScienceDirect - Tribology International : Influence of oil temperature on gear failures

I take it this means no one that has responded knows a critical temperature for gear oil?
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Old 12-28-2010, 10:46 PM   #17
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Non existent diff cooler on a 370z ==> Nissan 370Z Review; Drivetrain > 370z.com > 370z.com - Magazine

I've seen some 5th wheels that tow large campers on F450s run the rear diff covers for heat reduction and added fluid capacity. There is no spoon.

At least there was an answer to the unimportant gear oil temperature question.


If you haven't heard of something or don't understand it doesn't exist and should be ignored.

EOL...last reply.
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Old 12-28-2010, 10:48 PM   #18
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Quote:
Originally Posted by Sierra8 View Post
There is no reason why anyone makes dif covers that are aluminum and finned to remove heat from the oil or add additional fluid capacity. They make gauges to monitor temp for no reason. Some race cars have coolers for differentials for no reason. Because you've never seen a post it must not be a concern. The world must also be flat relative to what you've seen.

I take it being wrong about the gear oil in the 44 for towing applications caused some disturbance?

ScienceDirect - Tribology International : Influence of oil temperature on gear failures

I take it this means no one that has responded knows a critical temperature for gear oil?
Yeah, I missed that you were talking about towing. However that doesn't upset me in the least. Since you're obviously a genius, why don't you just find your own answer. If you are so superior, why bother asking?

They make a lot of things that are totally useless simply because some jackass will buy it. TORNADO Air Management Systems :: More Power! More Mileage!
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Old 12-28-2010, 10:51 PM   #19
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This thread is nearing the end of it's life span. End the attitudes now!
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Old 12-28-2010, 10:52 PM   #20
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Did anyone else see that "blip" on the sonar screen ??

Musta been unimportant--

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Old 12-28-2010, 10:55 PM   #21
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Funs over.

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