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Transmission temp help! #5437647 05/24/20 04:18 PM
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zx6rsi Offline OP
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My question is in regards to the transmission over heat light on my 2010 dodge ram. My trans temp got up to 275 and the light came on while towing, we turned tow haul mode on. ( it was accidentally left off) and everything was good and appears to be no adverse effects to the tranny. My mechanic told me as long as I pulled over when the light came on to let it cool its fine because thats the way dodge designed the warning system. Yet some people say once the lights on its done permanent damage already. Which is it? After driving all the way back home towing the same load tranny was fine. (Between 190-210 deg) depending on hilly or flat terrain. As well as driving with no load shifting just as good as it ever did. I checked the tranny fluid on the dip stick it doesn't smell burnt in any way and looks brand new. No sign of brownng or nothing. Whats everyones opinions? Like I said once the temp light came on I pulled over within 30 seconds and let it cool.

Last edited by zx6rsi; 05/24/20 04:20 PM.
Re: Transmission temp help! [Re: zx6rsi] #5437651 05/24/20 04:22 PM
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CT8 Offline
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How does the trans oil look if you wipe the dipstick on a white paper towel? Today's oils aren't the oils of the 1960's and 1970's


2015 F150 2.7
2018 F350 6.2
Re: Transmission temp help! [Re: zx6rsi] #5437652 05/24/20 04:22 PM
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dave1251 Offline
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It's a warning system for a reason. Meaning take immediate action or damage will be done. You took immediate action thus no immediate damage was done. If you want a 3rd opinion take it to another mechanic and you could service the transmission but I would not worry.


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Re: Transmission temp help! [Re: zx6rsi] #5437654 05/24/20 04:23 PM
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skyactiv Offline
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it's possible you reduced the lifespan of the transmission and there is no way to tell. I would add a transmission cooler.


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Re: Transmission temp help! [Re: zx6rsi] #5437662 05/24/20 04:33 PM
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joekingcorvette Offline
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I would do a the $275.00 transmission fluid exchange. I did it to my 2014 Ford F-150. It doesn't have a dipstick. I towed my heavy Lund Tyee GrandSport
150 miles each way yesterday and ran 80 mph all the way. The highest the tranny temp got to was 208. I have the manual option where I can lock it in any gear and it has 6 forward gears. I keep it locked in 5th gear all the way while going into the wind. With the wind on my back I can keep in in 6th gear most of the time except for a few hills on the way. I definitely would change that fluid. I ran my Corvette today on a 100 mile trip and it only got to 195 degrees tops. For about $275 or less I would do a flush and new filter.


2005 Chevrolet Corvette
2014 Ford F-150 4x4 supercrew
2014 Jeep Grand Cherokee Limited (wifes)
2012 Honda Civic 4 door (my daily driver)
2007 Lund Tyee Grand Sport Mercury 115HP 9.8HP
Re: Transmission temp help! [Re: zx6rsi] #5437668 05/24/20 04:42 PM
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zx6rsi Offline OP
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Here is the tranny fluid off dip stick

Well I'm not able to get the pic to upload but it's red/pink no browning.

Some people say I may have done damage bit I don't know why dodge would design the system to go off at a temp that damage can occur? Seems pretty stupid to me.

(4.1 MB, 3 downloads)
Last edited by zx6rsi; 05/24/20 04:45 PM.
Re: Transmission temp help! [Re: zx6rsi] #5437672 05/24/20 04:45 PM
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Chris142 Offline
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You took 50000 miles off of it's life. http://www.txchange.com/heatchrt.htm


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Re: Transmission temp help! [Re: zx6rsi] #5437674 05/24/20 04:48 PM
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MasterSolenoid Offline
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Originally Posted by zx6rsi
"Yet some people say once the lights on its done permanent damage already".

welcome
Then what would be the purpose of the Dash Light ?
Looks to me like you took the correct action.

Last edited by MasterSolenoid; 05/24/20 04:50 PM.

2002 Ford Ranger / bought new
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3.0 Liter Engine
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Re: Transmission temp help! [Re: zx6rsi] #5437712 05/24/20 05:29 PM
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The_Nuke Offline
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The transmission life span you can expect is the same as it was before.

The transmission fluid life span may have taken a hit, but only a small one, if any at all IMHO.


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 3.07 (215mm)
Re: Transmission temp help! [Re: zx6rsi] #5437713 05/24/20 05:31 PM
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Rand Offline
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why did it overheat? not like tow haul mode magically makes another fan blow.


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: Transmission temp help! [Re: zx6rsi] #5437717 05/24/20 05:33 PM
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ABN_CBT_ENGR Offline
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If this is a 1 off occurrence then you are probably fine mechanically but I would recommend a fluid change.

I would investigate how and why it ran that hot to begin with

Re: Transmission temp help! [Re: Rand] #5437722 05/24/20 05:35 PM
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zx6rsi Offline OP
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From what I heard the trans was trying to shift as if it wasn't towing a load and it was also using 6th gear while going up hills. Tow haul makes the transmission hold gears longer and not work so hard trying to find the perfect gear

Last edited by zx6rsi; 05/24/20 05:44 PM.
Re: Transmission temp help! [Re: Chris142] #5437725 05/24/20 05:36 PM
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ripcord Offline
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Originally Posted by Chris142
You took 50000 miles off of it's life. http://www.txchange.com/heatchrt.htm

I'm not confident that chart is completely accurate any more with today's semi and full synthetic fluids. Modern fluids are more oxidatively stable than the old Dexron/Mercon was. Also, if you notice it says "average" temperatures. The OP has not been running at 275f constantly, just for that one trip. It's not likely he took 50K off the transmission's lifespan.

That said, I like to change transmission fluid more often than the factory recommends because why not? I think the OP's truck probably calls for 60K transmission service intervals. Might be a good time to do a drain and fill, even if for no other reason than peace of mind.

Re: Transmission temp help! [Re: Rand] #5437738 05/24/20 05:52 PM
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ripcord Offline
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Originally Posted by Rand
why did it overheat? not like tow haul mode magically makes another fan blow.

Towing mode changes the transmissions shifting and torque converter lockup strategies to reduce the number of heat generating shifts and torque converter lock/unlock cycles. I'm not that familiar with the Chrysler truck transmissions, but it probably also increases coast clutch or similar mechanisms to increase the ability of the engine to slow the vehicle while coasting down hill, too.

Also, a 2010 Ram probably has an electric ECM controlled cooling fan so it is pretty likely that towing mode does indeed increase the duty cycle of the fan for increased cooling.

Re: Transmission temp help! [Re: Chris142] #5437808 05/24/20 06:55 PM
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gfh77665 Offline
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Originally Posted by Chris142
You took 50000 miles off of it's life. http://www.txchange.com/heatchrt.htm


That chart is garbage.

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