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01-16-2018, 09:25 AM
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#1
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Junior Member
Join Date: Feb 2016
Posts: 29
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Transmission temperature
Several months ago I read on this forum about transmission temperatures. Now I can’t find it to reread it. I’m trying to find out what transmission temperature is to hot. I have one steep grade mountain north west of Chattanooga I have to top every year to and from Florida. I watch my tranny temp climb. No alarm goes off but I alway stop at the top for an hour before descending. How hot is to hot?
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01-16-2018, 09:31 AM
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#2
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Insert witty title here
Join Date: Apr 2016
Location: About 30 miles west of Beantown.
Posts: 4,034
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Depends on the transmission. I've got an Allison and anything below 230 degrees is fine.
__________________
2021 Transcend Xplor 247BH
Husky WDH with Sway Control
2021 Chevy Silverado 2500HD LT 6.6L V8 Duramax
Forever in my memory. Forever in my heart.
Laurie J. Wood 3/22/67 - 8/23/19
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01-16-2018, 09:45 AM
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#3
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Senior Member
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,484
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My Ram usually runs cooler than that but has gotten a bit hotter towing in hills in the hot summer. My gauge, and Ram mechanic, says that is within spec. My previous Ram was designed to run cooler. Posting your truck and tranny may help you get better answers.
__________________
Cedar Creek Lake, Texas
2019 Keystone Loredo 290SRL
2019 Ram 2500 4x4 Cummins crew cab
Andersen hitch
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01-16-2018, 09:45 AM
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#4
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Junior Member
Join Date: Feb 2016
Posts: 29
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I have a 2009 Chevy 2500 Hd 6.0 with a 6 sp. has a tranny cooler
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01-16-2018, 09:48 AM
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#5
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,143
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Transmission temps are discussed daily on truck forums.
My 2017 F-250 sees temps around 225-230º regularly, towing or not.
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2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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01-16-2018, 09:56 AM
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#6
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Junior Member
Join Date: Feb 2016
Posts: 29
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Sorry should also add I’m pulling a 8500 lb 5er. I tried to search the forum for the past thread that was very helpful but can’t find it.
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01-16-2018, 09:56 AM
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#7
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Senior Member
Join Date: Apr 2015
Location: N.E. Fl.
Posts: 110
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Spousal unit had a transmission business a few years ago, he likes 160-180f. says 200+ decreases fluid life exponentially and he promotes draining fluid annually and then topping off, he's not a fan of flushing (sic) Hope ya'll don't mind a blond spouting off with second hand info...
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01-16-2018, 10:25 AM
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#8
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Senior Member
Join Date: Oct 2010
Location: Chesapeake, Va
Posts: 938
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Here's one.
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Jason and Billie
2018 F-250, 6.2L
2011 Prime Time Crusader 320RLT
"PT Crew Member Since 11/2010"
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01-16-2018, 10:28 AM
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#9
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Senior Member
Join Date: Oct 2010
Location: Chesapeake, Va
Posts: 938
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Another
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Jason and Billie
2018 F-250, 6.2L
2011 Prime Time Crusader 320RLT
"PT Crew Member Since 11/2010"
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01-16-2018, 11:01 AM
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#10
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Senior Member
Join Date: Feb 2015
Location: Oswego il
Posts: 2,430
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Quote:
Originally Posted by popeye305
I have a 2009 Chevy 2500 Hd 6.0 with a 6 sp. has a tranny cooler
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I tow heavy and I always have. I have been as high as the Eisenhower Tunnel out west and have towed on I40 over Black Mountain in NC in the east. My transmission temps never go over 200F. I have a transmission temp gauge and watch this when towing to ensure that I do not go over 200F when towing. One of the items I have installed on my truck was a Mag-Hytec deep dish oil pan with the temp probe in the transmission oil pan. This is a AL fin pan that will hold anywhere from 2 to 4 QTs of oil depending on the transmission make. The Al will help to dissipate heat from the oil along with your oil cooler. The extra oil will insure better fluid retention of debris suspended in the oil until they can be filtered out.
I would look into installing this on your truck with a actual probe in the pan oil with a transmission temp gauge to read the oil temps in the pan. Just my humble opinion!
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Jim W.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67, TDR 145K+miles
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01-16-2018, 11:20 AM
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#11
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Senior Member
Join Date: Jul 2014
Location: Nanaimo
Posts: 487
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I had my transmission bullet-proofed 3 years ago and my tranny guy told me the cooler the better, didn't discuss temps, but he recommended I run a semi synthetic transmission oil.
So I installed a Tru-Cool Max transmission cooler and it brought temps down by 30~35 degrees.
Easy install and well made cooler...I installed it in series with the stock cooler.
During a summer trip through the hills while pulling my 5er the highest transmission temperature I saw was 180... normal temps not hauling 150's.
Islander
__________________
'07 WildCat 30 RLBS ~ West Coast Edition ~ Trail Air - Tri Glide Pin Box 2000 F350 Lariat DRW 4x4 7.3 Diesel 89k miles Edge programmer, 4" SS exhaust turbo/back, Tru-Cool Max Trans Cooler, Bilstein Shocks Vancouver Island, B.C., Canada
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01-16-2018, 11:24 AM
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#12
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Senior Member
Join Date: Oct 2017
Posts: 176
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^^^ What he said up there. I added the Mag Hytec pan which increased my fluid by 6 quarts which keeps it cooler.
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01-16-2018, 11:36 AM
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#13
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Senior Member
Join Date: Jul 2017
Location: California
Posts: 7,616
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Pans are not nearly as good as the cooler that sits in front of the radiator. Also, putting a temp probe in the pan is not the best place to be measuring trans temps as the fluid has already cooled by the time it got there. Need to measure the temps where they are the hottest.
Some of those temp charts are old and don't accurately describe today's fluids. One of those shown before is over 20 years old. Dexron6 and Dexron3 have completely different break down temps.
I put in a Tru-Cool in my truck. Max temps I ever see anymore are 190. Going down the highway it depends on the air temp but maybe gets to 150 on flats. Before, I was getting close to 230.
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01-16-2018, 11:53 AM
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#14
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Senior Member
Join Date: Oct 2015
Posts: 364
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Pulling home on Sunday mine was at 110 after about 30 minutes at 60 mph.
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2017 Rockwood MiniLite 2506S
2022 F250 7.3/4.30
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01-16-2018, 10:08 PM
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#15
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Member
Join Date: Dec 2016
Posts: 81
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I have a similar truck. 6.0 six speed with the 3.73 gears. Normal operating temp is around 100 degrees over ambient temp. So if it's 75 degrees out you should see around 175. I don't think. You want to get over 230 on the temp but I would check your manual. May say in it. Had a duramax. They are the same way. Run it and if you see the temp Guage creeping over 200 take it easy to let it cool. These trucks were engineered for this.
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2006 Chevrolet 2500 Duramax with some added power / 2017 Salem Hemisphere 29BHHL
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01-17-2018, 08:00 AM
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#16
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Junior Member
Join Date: Jan 2018
Posts: 2
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Ram 1500 8 speed AT tranny has a thermostat that doesn't open fully until 190°f. Synthetic fluid non serviceable no dipstick. Modern trannys run much hotter than previous generation.
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01-17-2018, 09:02 AM
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#17
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Senior Member
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,484
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Quote:
Originally Posted by CedarCreekWoody
My Ram usually runs cooler than that but has gotten a bit hotter towing in hills in the hot summer. My gauge, and Ram mechanic, says that is within spec. My previous Ram was designed to run cooler. Posting your truck and tranny may help you get better answers.
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Edit: I must have had a memory lapse. I was thinking of coolant temperature. My tranny almost always ran 190 or below, only exceeding 200 a couple of times towing in 100 degree heat in Utah.
__________________
Cedar Creek Lake, Texas
2019 Keystone Loredo 290SRL
2019 Ram 2500 4x4 Cummins crew cab
Andersen hitch
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01-17-2018, 09:05 AM
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#18
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Senior Member
Join Date: Oct 2016
Location: New Jersey
Posts: 239
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My 2012 F150 has a stock xmission cooler and the thermostat for that cooler doesn't open until 190 degrees. Until it does the xmission oil temp should be close to engine coolant as there is a built in xmission cooler/heater element in the radiator.
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2017 Rockwood 2304DS Ultralite
2012 F-150 4X4 XLT 5.0 V8
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01-17-2018, 09:40 AM
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#19
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Grammar Pedant
Join Date: Aug 2017
Location: Frederick, CO
Posts: 1,580
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The transmission fluid itself needs to be considered. Even if you argued that your specific transmission likes 250 degrees (which nobody actually stated), the fluid does not. It's in the 225-230 range that the fluid begins to break down.
So, even if your transmission doesn't care about a journey through the mountains at 230+ F, you probably ought to flush your fluid when you get back home.
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Every time you use an apostrophe to make a word plural, a puppy dies.
TV: 2019 F-350 Lariat 4WD CCSB 6.7 PSD 3.55, 3,591 lb payload
Former RV: 2018 Rockwood Mini Lite 2504S
Former RV: 2007 Fleetwood/Coleman Utah
Former TV: 2005 F-150 King Ranch 4WD SCrew 5.4L Tow Package
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01-17-2018, 09:44 AM
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#20
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Senior Member
Join Date: Oct 2016
Location: New Jersey
Posts: 239
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Quote:
Originally Posted by 67L48
The transmission fluid itself needs to be considered. Even if you argued that your specific transmission likes 250 degrees (which nobody actually stated), the fluid does not. It's in the 225-230 range that the fluid begins to break down.
So, even if your transmission doesn't care about a journey through the mountains at 230+ F, you probably ought to flush your fluid when you get back home.
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2X.
__________________
2017 Rockwood 2304DS Ultralite
2012 F-150 4X4 XLT 5.0 V8
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