Jeep Wrangler Forum banner
  • Hey everyone! Enter your ride HERE to be a part of JUNE's Ride of the Month Challenge!

Status
Not open for further replies.
1 - 20 of 21 Posts

·
Registered
Joined
·
147 Posts
Discussion Starter · #1 ·
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.
 

·
Registered
Joined
·
228 Posts
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
 

·
Registered
Joined
·
519 Posts
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.
 

·
Registered
Joined
·
147 Posts
Discussion Starter · #4 ·
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.
 

·
Registered
Joined
·
147 Posts
Discussion Starter · #5 ·
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.
 

·
Registered
Joined
·
9,914 Posts
:) 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 !

:rofl::rofl: JIMBO
 

·
Registered
Joined
·
147 Posts
Discussion Starter · #8 ·
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.com/news_notes/nn15.pdf
Read step 22 ==> http://project-jk.com/jeep-jk-write-ups/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.
 

·
Registered
Joined
·
9,914 Posts
:) Don't worry, be happy !


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.com/news_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.
:rofl::rofl: JIMBO
 

·
The Bad Guy
Joined
·
23,234 Posts
75W-90 is the proper weight for the oil in the JK differentials.
 

·
Registered
Joined
·
147 Posts
Discussion Starter · #12 ·
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/repairqa/transmission/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?
 

·
The Bad Guy
Joined
·
23,234 Posts
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.
 

·
Registered
Joined
·
147 Posts
Discussion Starter · #14 ·
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/scienc...f1583a3d6b35e5562a69916c24d636b8&searchtype=a

I take it this means no one that has responded knows a critical temperature for gear oil?
 

·
Registered
Joined
·
790 Posts
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.
 

·
Registered
Joined
·
9,914 Posts
:rolleyes: With your ASKING ATTITUDE, I'm sure that someone here is going to--


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?
Give you exactly, what you deserve-

:punk::punk: JIMBO
 

·
Registered
Joined
·
147 Posts
Discussion Starter · #17 ·
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.
 

·
The Bad Guy
Joined
·
23,234 Posts
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!
 

·
Registered
Joined
·
9,914 Posts
:firedevil: Did anyone else see that "blip" on the sonar screen ??

Musta been unimportant--

:rofl::rofl: JIMBO
 
1 - 20 of 21 Posts
Status
Not open for further replies.
Top