2016 68RFE Temp - Dodge Cummins Diesel Forum
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post #1 of 10 (permalink) Old 02-16-2020, 09:03 AM Thread Starter
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2016 68RFE Temp

I just bought my first diesel about 2 weeks ago (2016 ram 3500 crew cab/long bed). I had the dealer take it to a local shop (highly rated) to have it checked out as I live 400 miles away. They said everything looked good. On the way home, I was flipping through the gauges and saw that the trans temp was 204 degrees with no load driving through Illinois (flat) with outside temps at about 32.

I took it to my local transmission guy and he checked it out. He said the converter is locking up nicely right as it shifts into 3rd and other than a slightly rough 3/2 downshift (which he corrected by adding the latest CPU update), everything looked great, including the fluid. He said he couldnít really even recommend a fluid change. He said some of the newer transmissions are running warmer.

Everything Iím seeing on the forum suggests thatís too hot for normal driving. I bought the truck to pull my 9k camper. Honestly Iím a little nervous to do so now, even though with the 3.42 rear end, I have a towing capacity of 17,550.

Thought?

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post #2 of 10 (permalink) Old 02-16-2020, 09:39 AM
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Get one of these....Revmax makes one too...

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post #3 of 10 (permalink) Old 02-16-2020, 11:22 AM
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Cooler bypass is probably sticking. Is the truck stock and what is the mileage and service history for the trans?

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post #4 of 10 (permalink) Old 02-16-2020, 09:41 PM
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Was 204 the warmest it got then dropped?

The bypass mentioned is cheap insurance if there was a potential issue with yours.

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post #5 of 10 (permalink) Old 02-16-2020, 11:57 PM Thread Starter
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I was kind of suspecting the bypass valve but figured my trans guy would have suggested it. Might be looking for a new shop.
It has 158,500 and is all stock. Bought it at a dealership but they didnít get any service records from the previous owner. On my trip back to Wi from Ohio where I bought it, is when I noticed it at 204. It did come down to 199 and pretty much stayed there. Since Iíve had her back, on my hour ride to work, it gradually gets up to 190-195, a couple times to 199.
Thank you all.
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post #6 of 10 (permalink) Old 02-17-2020, 07:21 AM Thread Starter
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Dodge engineers added that bypass valve to preheat the fluid. Any reason to not stick with an OEM replacement?
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post #7 of 10 (permalink) Old 02-17-2020, 11:42 AM
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Quote:
Originally Posted by Eda262 View Post
Dodge engineers added that bypass valve to preheat the fluid. Any reason to not stick with an OEM replacement?
It is there for a couple of reasons...faster heat up, milage improvement, etc...

The max tow trucks have had coolant-to-trans fluid heat exchangers too. The fluid goes to the coolant exchanger first then on to the fluid-to-air cooler up front. The coolant has a higher heat capacity than air, so you try to take a big "chunk" of heat out before going to the air exchanger.

My 2012 doesn't have a TBV from the factory, it goes straight to the air-to-fluid cooler in the front of the truck.

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post #8 of 10 (permalink) Old 02-17-2020, 11:55 AM
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I am of the opinion, the cooler the better. On the very rare cold days here in DFW (20F), it either won't lockup the convertor or go into the higher gears until the fluid heats above 50F(?) if I recall correctly. I don't recall exactly what it did, just had higher RPMs on the freeway until the fluid warmed up some and it shifted or locked the convertor.

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post #9 of 10 (permalink) Old 02-19-2020, 12:53 AM
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I would start by changing the trans fluid. My trans runs warmer when the fluid gets around 100k on it.

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post #10 of 10 (permalink) Old 02-19-2020, 01:33 AM
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Normal operating temperature for the 68rfe transmission in my 2015 is 164įf. My suggestion would be to replace the bypass valve but if you have an infrared thermometer it is easy to check. Drive the truck just long enough to get the trans temp to stabilize then pull over and with the vehicle still running take temp readings from all 4 lines on the bypass valve. Both outflow should be the same temp and both return should be cooler. If the lines on the trans cooler side are both cooler than the lines on the transmission side then the bypass valve is stuck closed and must be replaced. Good luck with it.

Also, IMHO 100k miles between transmission fluid changes is excessive. YMMV

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