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Old 12-22-2014, 09:39 PM   #101
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Originally Posted by bdornbush View Post
I guess my 2014 Jeep Grand Cherokee has a built-in trans temp gauge...
Does anyone have knowledge about how to look at trans temps while towing?
On one extreme, you can plumb in a sensor and wire it to a gauge. On the other extreme, the Dodge/Chysler/Jeep specific XGauge code list suggests that a ScanGauge plugged into the OBD port may be able to show transmission temperature - easy, if the code works for your vehicle.
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Old 12-23-2014, 05:52 AM   #102
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frontal area, trans temps

In my Jeep I take a quick look at the engine info once in a while when working the vehicle and expect and find each item near the midpoint of the gauge.
When I had a couple of smaller motorhomes with the Ford V-10 the stock gauges gave very little info so I used the scan gauge, a good tool.
Jack
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Old 12-23-2014, 10:02 AM   #103
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Originally Posted by Nindy View Post
Interesting. So much to think about. I will be towing my 17B with a 2014 Jeep Grand Cherokee Diesel in mid-March. Will make a not-so-direct fun trip from Chilliwack to Missouri, taking whatever route suits the weather at the time. I will give a report on how we do! The Jeep should be a beast pulling the trailer. I already get 30 mpg on the highway and 26-27 combined.
Could you please share the max tongue weight and the specific payload (value shown on the inside of the driver door) for your Jeep Grand Cherokee Diesel? The Jeep GC diesel looks very interesting to me if my Toyota Tacoma is not up to pulling the Escape 21.
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Old 12-23-2014, 10:04 AM   #104
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Originally Posted by padlin View Post
My temp seems to run about 100 over ambient once it warms up. Found this chart a few years back.
I recently installed an Ultraguage in my Toyota Tacoma to specifically monitor the transmission temp. I found out that the transmission warning light on the Tacoma does not illuminate until 300 deg. F.
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Old 12-23-2014, 11:35 AM   #105
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On my 06 GMC truck I had a questionable tranny, slip on hills and such. While towing up and down hills the Scangauge would show 100 degree swings while the needle indicator on the dash wouldn't even budge.
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Old 12-23-2014, 11:50 AM   #106
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Originally Posted by ATHiker View Post
I recently installed an Ultraguage in my Toyota Tacoma to specifically monitor the transmission temp. I found out that the transmission warning light on the Tacoma does not illuminate until 300 deg. F.
I recently asked my local Toyota dealer about exchanging the transmission fluid in my 2013 Tacoma for synthetic transmission fluid. I was told that it already had synthetic fluid; it came from the factory that way. That would explain the 300 deg F. trip for the warning light. I haven't researched this any, though.
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Old 12-23-2014, 01:47 PM   #107
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Am suddenly reminded of the term "idiot lights". Hope you never see that light for trans come on because it may be too late.
Automatic Transmission Temperature Chart - See how fast high heat can ruin your transmission.

The effect is also cumulative.**Short term exposure to high heat levels (or even prolonged**exposure to moderate heat)***can break down the oil to the point where even very short episodes of overheating will lead to failure.
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Old 12-23-2014, 02:22 PM   #108
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Great chart, going to print a copy and keep it in the glove box! I use a ScanGauge on my Tacoma, and have never gone above 225, and then only briefly. The Tundra has a built in tranny temp gauge, and it's needle has never moved above Normal, but I still plan on using a Scan Gauge there as well, eventually.
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Old 12-23-2014, 02:22 PM   #109
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Originally Posted by azjack View Post
In my Jeep I take a quick look at the engine info once in a while when working the vehicle and expect and find each item near the midpoint of the gauge.
That's typically how gauge calibration is done, although not always. I've heard of instrument panels with the gauges oriented so normal is horizontal for all needles - or vertical for all needles - except road and engine speed, both of which have no "normal". Unfortunately, in most vehicles styling and marketing seem to have been more important to the instrument design process than function.

A good example of non-functional instrument design, and a pet peeve of mine, is speedometers which go up to double the speed the vehicle will ever be driven, so the marking are jammed in twice as tight as they need to be and can't be read accurately or quickly.

Quote:
Originally Posted by azjack View Post
When I had a couple of smaller motorhomes with the Ford V-10 the stock gauges gave very little info so I used the scan gauge, a good tool.
The scan tools typically display digital values, which are precise but difficult to read at a glance. The gauges in my motorhome can't be read very precisely, but they show meaningful information at a glance. The gauges have probably changed over the years, but mine has coolant temperature, oil pressure, and transmission temperature (plus engine speed and of course road speed and fuel level) - pretty close to what I would ideally want to see to ensure that the drivetrain isn't overloaded, but oil temperature would be a good addition.
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Old 12-23-2014, 02:23 PM   #110
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Originally Posted by ATHiker View Post
I recently installed an Ultraguage in my Toyota Tacoma to specifically monitor the transmission temp. I found out that the transmission warning light on the Tacoma does not illuminate until 300 deg. F.
I thought everyone had a Scan Gauge and I was the only one with an Ultragauge

Mine's a couple of years old and I don't think it reads transmission temperature on my Ford Ranger. Did you have to put in any specific codes to make it useable on your Tacoma?

Ron
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