Success lowering trans temp with @chaulk04 mod

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JamesCrowe

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What's considered too hot for the 1500 8HP50 etc?
220°F was "acceptable" at the top of the range for the 6R80.
Not towing my Ram was running 81-82°C which is low 180s in weather around the freezing mark on the highway.
 

Sherman Bird

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What's considered too hot for the 1500 8HP50 etc?
220°F was "acceptable" at the top of the range for the 6R80.
Not towing my Ram was running 81-82°C which is low 180s in weather around the freezing mark on the highway.
Why on Earth would anyone want or accept 220 degrees of ATF temperature? Or, consider it "Acceptable"?
At that blistering temperature, the additives are rapidly deteriorating, the polymer base of the fluid (this gives the fluid dual weight properties) is declining, and the friction coefficiency necessary to this fluid is compromised. This leads to a burned up transmission in the short run.

Keep in mind what the long end game is for the manufacturer. That is to keep the consumer perpetually in debt over a depreciating liability.

This is accomplished largely through media, social proof, and the unspoken insinuation that, eventually, one will be free of financial burden regarding their vehicle(s).

Many is the time that I've had repair customers emote their frustration at car repair/ maintenance costs.
Many is the time that I witness customers choose to get rid of a relatively young car because it needs 3 or 4 grand in repair work, only to spend north of 30 grand NOT to spend a few grand.

An ounce of Prevention is worth a pound of Cure. Hmm... who said that? All 4 of my grandparents did. They all lived in the Great Depression and WW2. Old wisdom which applies in every aspect of our current modern lives!

Blow raspberries at those long game playing Auto manufacturers! Put as many advantages as you possibly can (within reason) to your benefit!

Keep your transmission cool! Add an auxiliary cooler. NEVER TOW IN OVERDRIVE!!!!!!! Use your Tow/Haul mode EVERY time you either load the vehicle to the hilt and/ or tow!

Peace! :)
 

JamesCrowe

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Cool.
I'm asking questions tho and didn't get an answer.
I follow the severe service schedule for my vehicles.
I'd like to know what is considered "too high" for the ZF 8HP50 since this truck has actual temp read outs and not a 4 position slow sweep gauge like my F150 did I am able to keep an eye on temps.

*Edit* what I'm asking here is there some sort of published numbers from the manufacturer to reference? If so, where can I find it.
 

RamDiver

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Cool.
I'm asking questions tho and didn't get an answer.
I follow the severe service schedule for my vehicles.
I'd like to know what is considered "too high" for the ZF 8HP50 since this truck has actual temp read outs and not a 4 position slow sweep gauge like my F150 did I am able to keep an eye on temps.

*Edit* what I'm asking here is there some sort of published numbers from the manufacturer to reference? If so, where can I find it.

The manufacturer tells us the change the motor oil at 10K km or 10K miles for the US.

They also tell us that the transmission fluid does not need to be changed.

I wouldn't trust anything they say on the topic and would advise you reconsider if you're prepared to follow their recommendations.

The bottom line is excessive heat will kill the additives in the tranny oil and should be avoided. Also, the tranny manufacturer (not FCA) has specified a fluid change between 130K & 150K kms, IIRC. AFAIK, many members choose to change at about 60K miles.

There are endless posts and threads discussing this topic on Ram Forum.

Try the search utility in the upper right side for more info.

.
 
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Sherman Bird

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The manufacturer tells us the change the motor oil at 10K km or 10K miles for the US.

They also tell us that the transmission fluid does not need to be changed.

I wouldn't trust anything they say on the topic and would advise you reconsider if you're prepared to follow their recommendations.

The bottom line is excessive heat will kill the additives in the tranny oil and should be avoided. Also, the tranny manufacturer (not FCA) has specified a fluid change between 130K & 150K kms, IIRC. AFAIK, many members choose to change at about 60K miles.

There are endless posts and threads discussing this topic on Ram Forum.

Try the search utility in the upper right side for more info.

.
Well put!
 

JamesCrowe

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Found a couple threads where others said trans temp stayed below 200°F and coolant got as high as 240°F.
Nobody jumped on to lecture them so I'll assume that's normal temps and carry on.
 

RamDiver

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Found a couple threads where others said trans temp stayed below 200°F and coolant got as high as 240°F.
Nobody jumped on to lecture them so I'll assume that's normal temps and carry on.


This thread has lots of interesting discussions on this topic and might assist you in determining exactly where your comfort level is with the tranny temps.

The thread is a bit long, 66 pages, but contains great info. I'd suggest reading every post in the first 2 pages, to construct a good foundation on the topic, and possibly skimming from there on.


.
 

Wild one

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Found a couple threads where others said trans temp stayed below 200°F and coolant got as high as 240°F.
Nobody jumped on to lecture them so I'll assume that's normal temps and carry on.
If you use the temps the 8 speed runs at in the Heavy Duty 3/4 ton trucks,i'd say the ideal temp is around 160/165.I've never seen anything from either ZF or Stellentis mentioning an ideal temperature,so all we have to go off,is what the HD trucks run the transmission at,not the 1500's which pre-heat the transmission fluid.Little tidbit for you,only the 1500's use the thermal management heater on the side of the 8 speed,the 5.7 and 6.4 cars and the HD trucks don't use the pre-heater.
Cruising around back roads at 50 mph on a summer evening,my wifes 1320 Challenger which has a factory high stall convertor and transmission brake in it's 8HP70 runs between 150 and 155,even at 80+ mph on a 90 degree day,it just barely gets to 170 on a 2.5 hour trip.
Also there does seem to be some descrepancy between the transmission thermostats in the 1500's,some trucks will run right around 180,while the next virtually identical truck will run at 190+ on transmission temps,which leads me to think the quality control on the transmissions thermostats,isn't all that great
 

18CrewDually

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You can make your own decisions based on how long you want the trans to last. You can either get the temp down or more frequent services. I'm happy my trans runs at 165°f.
If you're a person that trades it in before the warranty is up it probably doesn't matter to you. But I tend to keep vehicles for well past and upwards of 200k miles.

Screenshot_20231128_142029_Chrome.jpg
 
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