blt2ski
Kirkland, Wa
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Cummins12V98 wrote:
Must have been very impressed to save that pic!
Or he forgot it was a simple gasket that failed, like many do at times before the REST of the unit fails!
Marty
92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
2014 Chevy 1500 Dual cab 4x4
92 Red-e-haul 12K equipment trailer
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cummins2014
Utah
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Grit dog wrote:At cummins2014, I hadn’t either, but I’m not a gauge watcher. I’d rather be jammin tunes, on the phone and/or sippin a couple road sodas on my long time coming well earned infrequent vacations.
But that thermostat/cooler bypass thingy as I understand it either works great or it doesn’t work at all. If I towed more or worked my personal truck harder I woulda replaced it 3 years ago when I bought the truck.
(I also didn’t realize how stupid simple it was to remove and replace. I did it along with a trans service but by itself, it’s a 0 beer job (can’t drink laying on your back with trans juice dripping all over lol), so call it a 30 minute job including refilling a few lost units of trans blood).
What I understand about the bypass is that it does nothing for cooling , just insures the fluid is flowing .
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Grit dog
Black Diamond, WA
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^You mean if the thermostat is closed, it bypasses the cooler, resulting in very little cooling? That is correct.
So yes it has everything to do with cooling. Closed/bypass = no cooling. Open to the trans cooler = normal cooling.
Fwiw the OE part does a GREAT job at warming the transmission quickly.
Not long after the engine is up to full operating temp from a cold start, the trans fluid is holding right at 170 ish.
With no bypass and full cooling flow all the time, you can drive an hour and the trans hasn’t even come close to 170. Just drove to work in the Ram today. An hour later, trans was at 135deg.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold
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Bionic Man
USA
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Grit dog wrote:Bionic Man wrote:My 68RFE regularly saw temps above 200*. 220* was pretty common for me. Must be that Amsoil fluid that keeps yours so cool.
Towing what, where?
My 5er. I70 in Colorado.
2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010
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Bionic Man
USA
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blt2ski wrote:Cummins12V98 wrote:
Must have been very impressed to save that pic!
Or he forgot it was a simple gasket that failed, like many do at times before the REST of the unit fails!
Marty
Isn’t that a phot or the pan on his 68RFE? Back when he considered that a great transmission?
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cummins2014
Utah
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Grit dog wrote:^You mean if the thermostat is closed, it bypasses the cooler, resulting in very little cooling? That is correct.
So yes it has everything to do with cooling. Closed/bypass = no cooling. Open to the trans cooler = normal cooling.
Fwiw the OE part does a GREAT job at warming the transmission quickly.
Not long after the engine is up to full operating temp from a cold start, the trans fluid is holding right at 170 ish.
With no bypass and full cooling flow all the time, you can drive an hour and the trans hasn’t even come close to 170. Just drove to work in the Ram today. An hour later, trans was at 135deg.
What I have heard is the trans fluid bypass delete does nothing for better cooing ,just insures the fluid is flowing ,and just takes longer to reach whatever the trans runs at ,in my case 172 . If the trans is going to run 180-190 towing heavy in hot weather that delete will not help .
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Grit dog
Black Diamond, WA
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^100% correct. It’s the risk of while towing heavy (or otherwise), having it stick closed and heat the trans oil up to frying pan temperatures in very short order.
It’s pretty easy to discern if the temps are moderately higher than the thermostat set point as you and others have described, vs unexpected temp increase with no plausible reason.
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Bionic Man
USA
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I don’t know what the threshold for temps that will damage gaskets/fluids/transmission is, but it certainly is FAR north of 200*. The only vehicle I’ve driven that kept temps well below 200* is my 2023 RAM/Aisin.
All others saw 200 regularly. My 2022 Grand Cherokee was at 196 yesterday in the city and my 2019 Expedition was at 205 this afternoon. I can probably show a 230 photo next week after pulling my boat through the Colorado mountains.
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4x4ord
Alberta
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My '22 Super Duty was at 201 today (68 outside temp); towing nothing; driving 50 mph down a country road. The engine temp was at 185. One question I have is: Where is the temperature sensor? Could it be Ford measures 205 degrees leaving the transmission and Ram measures 160 degrees leaving the cooler?
* This post was
edited 08/10/23 03:58pm by 4x4ord *
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Grit dog
Black Diamond, WA
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^Good point. But bottom line, the fishing expedition about trans temps when it’s as designed is laughable.
Kinda like saying you gonna put a 160deg thermostat in the cooling system of your new Eff 2 Fiddy like when you tried keepin that old 1977 AMC Pacer cool in traffic back when Reagan was president!
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