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another mark
Dodge Dakota
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5/26/2004
18:01:31
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 Subject: What is normal temp of trans fluid?
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Message:
I just installed a gauge for monitoring trans temp fluid before it hits the cooler and wondering if anyone knows the normal temp range of this stuff?
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matt
Dodge Dakota
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5/26/2004
18:43:51
| RE: What is normal temp of trans fluid?
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Ya might ask a dealership... I'm thinking it should be between operating temp, (whatever your thermostat is) and 240... you might ad on auxiliary tranny cooler, I added one, and it actually dropped the operating temp of my engine a bit too, great insurance for the tranny too. All automatics tend to have their lifetime and durability improved thru heat disipitation.
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.boB
Dodge Dakota
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5/26/2004
19:34:58
| RE: What is normal temp of trans fluid?
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160-180* is just about right. Anything over 200* and you're starting to get in trouble.
I pasted this from another site, and I think it's a pretty good GUIDE. But don't think that it's carved in stone, because there are some other variables involved. For instance, hauling a big trailer up a hill vs. coasting empty down a hill.
The approximate life expectancy at various temperatures is as follows:
175F 100,000 miles
195F 50,000 miles
212F 25,000 miles
235F 12,000 miles
255F 6,250 miles
275F 3,000 miles
295F 1,500 miles
315F 750 miles
335F 325 miles
375F 80 miles
390F 40 miles
415F Less than 30 minutes"
I copied this from the same site:
It's listed in Workhorse's manual for the 4L80E transmission, heres the direct Quote:
TRANSMISSION FLUIDS
Automatic transmission fluid can provide up to 100,000 miles of service before oxidation occurs under normal operating temperatures of about 175 degrees F. Above normal operating temperatures, the oxidation rate doubles (useful life of the fluid is cut in half) with each 20 degree increase in temperature. (See the following chart) "the chart is the one you listed, I'll not repeat it here."
Following the chart it states:
Note: The above chart is based on the assumption that oil temperature remains constant to the miles indicated. Temperatures that appear for short periods, such as climbing hills, etc., would need to be averaged against normal operating temperatures to determine actual life expectancy.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/13829702/gotomsg/13829748.cfm
This is also interesting: http://k0swi.microlnk.com/REVIEW/AUTO/LUBES/ENVIRO/AUTOMATIC%20TRANSMISSION%20COOLER%20FACTS_.htm
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Mudlizard
Dodge Dakota
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5/26/2004
19:47:08
| RE: What is normal temp of trans fluid?
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Message:
I have a tranny temp gauge hooked to the Mopar pan I put on. I also have a Derale tranny cooler and it never goes over 150. I agree with .bob, if you see it go over 200......not good. keep it cool as you can.
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another mark
Dodge Dakota
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5/26/2004
22:47:27
| RE: What is normal temp of trans fluid?
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Thanks guys. I had a T manifold installed and the tranny shop must have hooked it up to the return line instead of the feed. Damnit. The gauge gets to about 125 at idle only.
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matt
Dodge Dakota
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5/27/2004
19:06:53
| RE: What is normal temp of trans fluid?
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thanks for correcting me... I knew it was close to operating temp of the engine.....
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Buck Harley
GenI
 
5/27/2004
20:39:35
|  RE: What is normal temp of trans fluid?
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If it does not go over 140* this a plus as heat kills a Auto Trany. Make sure your add on cooler is inline between the Rad. and the Trany. "Return line"
Buck
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another mark
Dodge Dakota
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5/27/2004
20:45:03
| RE: What is normal temp of trans fluid?
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I'm using the factory cooler built into the radiator. I do not have any add on coolers.
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