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Old 09-26-2012, 01:48 PM   #15
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Asheville , North Carolina
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It is all how you add it up

Originally Posted by thomp View Post
Face it you must get a honking big diesel as soon as possible!

Think of this way, we can't afford obamacare either, but we are "buying" it anyway... That buying in your budget is so quaint... You got to follow our leaders example!
As a 12 year cancer survivor who was just diagnosed again this June, I can not afford to not have the Patient Protection and Affordable Care Act. This most recent case would have bankrupted me if the insurance company were able to deny me coverage for pre- existing condition.

I guess it is a lot like spending $130 for a ScanGauge or installing an extra tranny cooler in an attempt to keep from having to spend thousands on a new transmission after running it to hot. Some times we have to invest money to protect from greater loss in the future.

I guess it is all about perspective

Jonathan Hettrick

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Old 09-26-2012, 02:01 PM   #16
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Hey Jon, I tow with a 3500 Ram diesel and my temp gauge does the same thing. Maybe happens a little later or only on a longer hill but the same thing happens. It's normal and so long as you keep an eye on it and it doesn't go too much higher you got nothing to worry about. You're still a long way from the " DANGER ZONE".

See ya on the road sometime.

Roger in NJ

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Winston Churchill 1948

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Old 09-26-2012, 02:16 PM   #17
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I'll second the vote for the ScanGauge II. I currently have mine set to display transmission temp, engine coolant temp, current horsepower and current MPG. I'm thinking of replacing the MPG with another register because it's depressing.

Depending on the year of your truck, some things may either be unavailable or may require a little tinkering with the ScanGauge setup. For my '07 F150 transmission temp I had to define the register to query, but the information on how to set that up was readily available. For my particular transmission, slip ratio and input torque aren't available... I'm OK with slip ratio, I can tell by feel and/or RPM whether the converter is locked up or not, but with a newer 6- or 8-speed transmission that wouldn't be nearly as definite. I'm sure those newer transmissions have more data available for the ScanGauge, though.

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Old 09-26-2012, 03:01 PM   #18
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Another option is to add somethin like Royal Purple Purple Ice. Its guaranteed to drop your coolant temps somethin like 10 degrees
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Old 09-26-2012, 03:22 PM   #19
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The Computer Will Protect the TV From You

Originally Posted by ElCamino Man View Post
Another option is to add somethin like Royal Purple Purple Ice. Its guaranteed to drop your coolant temps ...
That must be one of those "water wetter" snake oils; good luck with pursuing non-performance remediation.

Okay, that was snarky. What I meant to post first was that, with modern-day vehicles, the on-board computer monitors coolant and ATF temperatures. If one or both should get too warm, a message will be presented to you suggesting you slow down.

Should you choose to keep the petal to the metal, the computer will cut power to some of the engine's spark plugs which WILL slow you down.

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Old 09-26-2012, 03:59 PM   #20
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I "third" the recommendation for a ScanGuage II - real numbers and lots of options for configuring what it is you want to monitor.

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Old 09-26-2012, 04:52 PM   #21
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Power's not the be all and end all. For the benefit of the OP, we tugged our 2011, 28' International down from Canada to Florida and home via New Orleans last year and used our trusty 2011 3.5L V6 Toyota Sienna. It was high eighties to low nineties Fahrenheit all the way down and the engine temp gauge never once moved away from dead centre. On the trip along the I10 between Tallahassee and Mobile the outside temperature was showing high nineties and I did see a tiny movement north of normal but after a stop for lunch it went straight back down to normal again and stayed there. Sure, there are no real hills apart from the I75 in Tennessee but even so, the TV coped really well. We do have an additional transmission cooler.
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Old 09-26-2012, 05:46 PM   #22
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I use to watch mine, and the transmission temp gage too. But they have never, and I mean never moved. Going up hill in the rockies, heat of the desert, anywhere. They just sit where they normally do.

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Old 09-26-2012, 05:56 PM   #23
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Modern cooling systems are way better than they use to be. Overheating when towing was common decades ago. Transmissions can still overheat if additional cooling is not available. I would always prefer a manual transmission for overall reliability. The scanguage II is good insurance. You can see problems before they become real problems. You can see exact numbers not gages that are not calibrated in real units. It also doubles as a code scanner and you can move it from vehicle to vehicle.

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Old 09-26-2012, 05:58 PM   #24
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My experience with 2 former Jeeps with the 4.7 L V8 was the same as Chillpoints so I think this is normal for that motor. I always used the tow haul mode and kept the rpm at 3200 to 3400 on hills. I also used Mobil 1 synthetic. The HO version of the 4.7 got much better gas mileage than the regular version. My safari weighed in at 6000 lbs.
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Old 09-26-2012, 06:00 PM   #25
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No don't mess with cooler thermostats. That may have worked during the 70's but it can really mess up a computerized engine. Everything is based on that engine temperature.


Originally Posted by ElCamino Man View Post
I dont think youd see much difference in engine temps by putting in an aux tranny cooler. One thing you could do (as long as it doesnt mess with your computer) is put a cooler thermostat in. I noticed on my F-250 itd get hot if I just let it idle for too long. Replaced the thermostat and viola! Doesnt creep much. I also have an aux trans cooler on mine, but its to keep the tranny cool, not the engine.

And your gauge on your truck would be a dummy gauge. It shouldnt read much difference whether its actually getting hot or not. You could install either an aftermarket gauge, or like stated earlier, a ScanGauge. Then you can monitor EVERYTHING on your truck, including engine and tranny temps. Theyre not bad priced either. I think something like $130
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Old 09-27-2012, 08:20 AM   #26
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Hence the reason I said unless itll mess with your computer lol. I was gonna put a cooler thermostat in my 1992 F-250 but the guy behind the counter sad itd prolly be best to stick with the stock one. If itd mess with a 1992, im sure itd mess with a newer one
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Old 09-27-2012, 08:21 AM   #27
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We went through the same analysis as you did ... finally adding an extra guage (Aeroforce) to our jeep to specificallly monitor transmission temperature (hence, we use the jeep for very limited towing). Although the trans temp generally lags behind the coolant temp shown on the dash guage, your pic looks to be in the acceptable range for temps. As for your other concerns about climbing a lot of hills or long haul mountain driving - we did the same analysis there, too and ultimately decided upon something a bit larger than our 1/2 ton truck. We bit the bullet - so to speak - and opted to replace our 1/2 ton (paid for) with a 3/4 with diesel (still paying) simply for the torque ($$$, yes, I know) - it makes the mountainous driving where we live so much easier and pleasant ... no more string of cars behind us "antsy" to pass ... not to mention HD tires & brakes for safety, tow/haul mode, and compression brake for downhill. We really enjoyed our F150 1/2 ton with the 20' AS, but we agonized at every mountain pass and now - with the 3/4 - those passes effortlessly disappear behind the 3/4.

Where previously, the 1/2 T transmission was always hunting for the right gear (read that heating up) while ascending, the 3/4 transmission rarely even downshifts. There is usually a higher cost in purchase price as well as diesel fuel, however; only you can decide if the mountains will offset those increased costs. For us, it was a no brainer living in the middle of the Rocky mountains. Most TVs are a compromise between superior city vs highway/towing performance. Our 3/4 does not compromise its towing/hauling design for city driving and exacts the toll of higher operating costs with much lower mpg. Yes, we'd buy both the AS and the diesel Ram over again! That comes from an old phart on a penny-pinching verrrrrrry limited income.
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Old 09-27-2012, 08:39 AM   #28
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While having a transmission cooler in front of the radiator will transfer some heat back to the water in the radiator, the radiator has so much more surface area that the amount of heat gained will be dispersed out of the radiator. It's surprising how efficient the radiators are.

The big thing to remember if you add an auxiliary cooler is to make sure you remember that there is an internal transmission cooler that may be part of your engine radiator system. Make sure that the transmission oil output from that cooler is routed to the input of your new cooler. Doing it in reverse will actually reintroduce heat back into your transmission oil, thus voiding the benefit of the external cooler. Typically you can identify the output of the internal transmission cooler by touching the two metal pipes that typically are at the lower portion of the engine radiator. The cooler pipe will identify the output flow from the internal cooler.

My GMC van's factory trailer package includes an external transmission cooler and it is mounted in front of the engine radiator.

I've always either added or had external transmission oil coolers on every tow vehicle I have ever owned. Keeping the transmission changed at appropriate times, towing in the correct gear (follow the manufacturer's recommendations in your owners manual) and use of external coolers has kept me away from transmission issues in my years of towing.


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