17 ram 6.4 hd trans overheating

[Mattera350]

truck has a 2.5” lift on 18x10 25mm m0970 wheels wrapped in 35” tires straight pipe exhaust trans been running 169 on 70* days started to slip checked fluid it was a quart low how? Not sure where it went added a quarter next days 92* out and trans light comes on at 182 over heating pulled over at the next gas station 1/4 mile up the road trans went up to 230* let the truck sit off for an hour started it back up trans still at 200* this is also the Same truck that’s been though 4 gas tanks n 5 fuel pumps... and counting dealers can’t figure the issues out but refuse to replace it under Lemmon law

 

[HammerHead]

truck has a 2.5” lift on 18x10 25mm m0970 wheels wrapped in 35” tires straight pipe exhaust trans been running 169 on 70* days started to slip checked fluid it was a quart low how? Not sure where it went added a quarter next days 92* out and trans light comes on at 182 over heating pulled over at the next gas station 1/4 mile up the road trans went up to 230* let the truck sit off for an hour started it back up trans still at 200* this is also the Same truck that’s been though 4 gas tanks n 5 fuel pumps... and counting dealers can’t figure the issues out but refuse to replace it under Lemmon law

We're you towing?

 

[Iron Outlaw]

How many miles are on it? That's crazy having that many problems. Might have fried it when it was low on fluid.

 

[R.D.J.]

In my opinion, trans temp would have to be verified with scan tool/thermometer/thermal imagery (which is likely to be accurate). Once that is done, perhaps the correlation of your poor MPG, and trans overheating could be attributed to a failing torque converter.

FYI a thermal imaging camera is useful for finding blockages in cooling systems, be it oil, trans fluid, or coolant.

 

[Firebird]

That's hot! Mine has never gone above 170 degrees, and I'm in hot Florida

 

[wgreggking]

Mine stays at 168 not towing, 172-174 while towing 4K trailer in 105 degree plus outside air, up steep grades in Az. Somthing's wrong.

 

[HammerHead]

Mine stays at 168 not towing, 172-174 while towing 4K trailer in 105 degree plus outside air, up steep grades in Az. Somthing's wrong.

Me too, right at 168 on the nose empty.

 

[PatinAZ]

I'm surprised they aren't blaming it on lift/tires.

 

[ripping r]

You guys run cooler than me. I see 185 not towing. Have not towed yet.

 

[Megazor]

Dang it, I need to stop reading some of this issue threads. I've notice the last few weeks my transmission temp has been running between 186 and 190 while driving in mixed traffic. Truck has no lift and 35 inch tires. Today the transmission reached 205 degrees while I was stuck in a traffic jam for an hour. Every now and then I have also heard a high pitch whine while in first and second, which I'm pretty sure is coming from the transmission. Doesn't make the sound in park or neutral. Today when I heard the noise I put the truck into tow/haul mode and the sound went away and my transmission temperature dropped 10 degrees.

My truck has had transmission problems from the start. I've had the shift solenoid replaced twice under warranty at 2500 and 25000 miles. Guess its going back to the shop soon.

Anyone have any troubleshooting advice before I take it in? I have little trust for my dealership after my last couple visits. Last trip I asked them to flush the brake fluid and the service tech only vacuumed out the reservoir. Took several hours to get them to complete the job correctly.

 

[pcschwenke]

My 2016 6.4 with 4:10 gears never has a trans temperature above 172F. This includes towing a 9200lb trailer.

 

[SouthTexan]

Does the 66RFE have a trans cooler thermal bypass valve(thermostat) like the 68RFE? If so, this may be the culprit for some of you. There have been a few people in the Cummins forums with bypass valves that were not operating correctly and they were seeing temps like this. Most of them just removed it since it is mainly their to get the trans fluid up to temp quicker in colder weather and nothing more.

 

[River19]

Same temps here, 168 normally and maybe 174 when hot and towing etc.

 

[busterbrown]

Trans temp for me stays under 170* when towing a 7K lb travel trailer. Never seen it go over 175* even in the Smoky mountains.

 

[ripping r]

Does the 66RFE have a trans cooler thermal bypass valve(thermostat) like the 68RFE? If so, this may be the culprit for some of you. There have been a few people in the Cummins forums with bypass valves that were not operating correctly and they were seeing temps like this. Most of them just removed it since it is mainly their to get the trans fluid up to temp quicker in colder weather and nothing more.

I would lile to know . this auto was the one thing i dont care for. Loved my manual in my 06. But thought afrer all these years they would have an auto that did not suck. Guess i was wrong .My truck is just at 2000 miles and has run these temps from day one.

 

[Megazor]

Grabbed a quick picture after dropping the kids off at school. These were the temps after 20 minutes on the highway no trailer or load.

SouthTexan, thanks for the suggestion. I'll ask about the bypass when I get the truck in.

Mattera350, any updates on your truck?

 

[Mattera350]

Does the 66RFE have a trans cooler thermal bypass valve(thermostat) like the 68RFE? If so, this may be the culprit for some of you. There have been a few people in the Cummins forums with bypass valves that were not operating correctly and they were seeing temps like this. Most of them just removed it since it is mainly their to get the trans fluid up to temp quicker in colder weather and nothing more.

Same temps here, 168 normally and maybe 174 when hot and towing etc.

Trans temp for me stays under 170* when towing a 7K lb travel trailer. Never seen it go over 175* even in the Smoky mountains.

I would lile to know . this auto was the one thing i dont care for. Loved my manual in my 06. But thought afrer all these years they would have an auto that did not suck. Guess i was wrong .My truck is just at 2000 miles and has run tjsse temps from a day one.

Grabbed a quick picture after dropping the kids off at school. These were the temps after 20 minutes on the highway no trailer or load.

SouthTexan, thanks for the suggestion. I'll ask about the bypass when I get the truck in.

Mattera350, any updates on your truck?

View attachment 137350

Truck went to the dealer (trans got stuck in first) at 242* trans temp 89* outside verified temps with a scan tool n heat gun rechecked trans fluid after new filter n fluid change once again low on fluid right after the dealer serviced it. While towing I see temps 250+* will be back to the dealer this week I’m going to assume the trans is fried at this point. For a new truck n all this issues thinking about sending the truck for a stage 3 trans and aux cooler to try and keep the temps around 160*

 

[Mattera350]

They blamed my fuel pump and evape vent lines on the lift but covered it after I argued a suspension lift will not hurt fuel lines as I’m lifting the suspension the only lines for potoenial issues would be break lines. Long story short multiple trips and attempts to fix it that issues finally taken care of now Dealing with this trans the truck does tow 12-13k when first bought it had no issues with trans temps about 4 months into owning it the the trans would not go into park. The radio freezes were I have to disconnect my battery to have it work again. Filed with fca for Lemmon law as I just hit 24k miles and all these issues I’d expect to see on a older truck not a 17

How many miles are on it? That's crazy having that many problems. Might have fried it when it was low on fluid.

That's hot! Mine has never gone above 170 degrees, and I'm in hot Florida

I'm surprised they aren't blaming it on lift/tires.

 

[Mattera350]

Grabbed a quick picture after dropping the kids off at school. These were the temps after 20 minutes on the highway no trailer or load.

SouthTexan, thanks for the suggestion. I'll ask about the bypass when I get the truck in.

Mattera350, any updates on your truck?

View attachment 137350

Truck will be back to the dealer this week as it is stuck in 1st after they serviced the trans and low on fluid again maybe an internal leak as there is no spots under the truck.

 

[Megazor]

Truck will be back to the dealer this week as it is stuck in 1st after they serviced the trans and low on fluid again maybe an internal leak as there is no spots under the truck.

Sorry to hear that. I hope it is quickly resolved for you.