[Silentbob76]

I'm sure this is normal (GOD I HOPE THIS IS NORMAL) but twice I've driven on non highway mountain roads that were windy and not a real step grade but just bumpy as hell and both times the trany temp was kind of high. 1st time I was pulling a trailor with about 6-7K of hay and the temp got well abouve the 220* range and possibly hit 250* but I don't remember exactly, I was following another truck up so the going was slow and I pretty much had to climb the hills with no forward momentum to keep from running him over and the 2nd time with a empty truck different road but cruising at about 5-10 mph since it was so washed out and my temp got to about 200* but didn't go past that, when I got back on the paved road and got up to highway speeds the temp dropped back down to normal range of about 120* to 150*

is this normal, I've never had gauges to see what exact temps the truck was running so I wouldn't know if this was normal for these conditions.

Bad thing about gauges is unless you have some experience with them you never know if something is wrong unless the number are just way out of place

Robert

 

[MuscleHead]

I'm sure this is normal (GOD I HOPE THIS IS NORMAL) but twice I've driven on non highway mountain roads that were windy and not a real step grade but just bumpy as hell and both times the trany temp was kind of high. 1st time I was pulling a trailor with about 6-7K of hay and the temp got well abouve the 220* range and possibly hit 250* but I don't remember exactly, I was following another truck up so the going was slow and I pretty much had to climb the hills with no forward momentum to keep from running him over and the 2nd time with a empty truck different road but cruising at about 5-10 mph since it was so washed out and my temp got to about 200* but didn't go past that, when I got back on the paved road and got up to highway speeds the temp dropped back down to normal range of about 120* to 150*

is this normal, I've never had gauges to see what exact temps the truck was running so I wouldn't know if this was normal for these conditions.

Bad thing about gauges is unless you have some experience with them you never know if something is wrong unless the number are just way out of place

Robert

I wish i knew mine. This PMT does not show trans temp yet :thud:

 

[slagburn]

Sounds about right for what you were doing.

One of the hotshot guys on here mentioned that he hates driving in the city because the trans temp skyrockets - mine has almost hit 200 empty in stop and go while putting around in the city.

 

[Rockwerx]

It sounds like some roads I have been on as of late...very rough and steep so you have to go slow while towing a huge load. My Edge alert went off a few times indicating higher than normal transmission temperatures. I kept an eye on it and kept on driving and it would go down after we crested some hills.

If this had happened to me on the highway I would have geared down and hoped that the temps would drop. If they continued to climb with no places on the road for the temps to drop then I would slow down. This is what you do when opperating a semi and the pickup when towing is like a small version of a semi truck.

 

[sofakingbad]

im from ruidoso what roads you talking about

 

[sofakingbad]

if you are going slow up steep hill yes your temps will prob get that high... I invested in some gauges that make me a lot more comfortable when I am towin!!

 

[atc250r18]

I havn't seen 200 yet in any situation. I only pay attention when I'm towing and that's usualy up to 8k. I've done everything from bottom of the hill merging to passing the ARswhole in the prius. Sounds high to me.

 

[slagburn]

IMO the low speed high load situation is probably the hardest on the trans temp in terms of lack of cooling and maximum slip - high speed high load as long as the TC is locked up shouldn't be too bad.

The trans cooling seems to have been designed with highway speed pulling in mind; what concerns me the most about the original post is that if 250 was possibly measured in the pan I don't want to know what it was going out to the cooler. Unlike traditional designs there is no heat exchanging with engine coolant on this truck this keeps the temps down on the highway but doesn't help much when there is minimal airflow through the cooler.

I measure trans temp both in the pan and out to the cooler and find up to a 30 degree difference in readings (out to the cooler is higher) when putting around in the city on a warm day - on the highway locked up they read about the same.

This may partially explain some of the premature 68re failures that we've read about within the heavy RV community...

 

[js4024]

Sometimes too much info is a bad thing....

I am an anti "mod" kinda guy...been burned a few times from the peddler selling snake oil. Typically the trans temp will reflect the radiator temp. Its cooled using a trans oil cooler and water lines going to the transmission from the radiator.

Under normal conditions, if the truck gets hot, the oil, water, trans get hot. When put under stress things get hotter. The transmission has its own control module that will cause the TC to lock and unlock, clutches to slip, and shift patterns to change as needed for full service operation. Let the electronics you bought with the truck do what the DESIGNERS wanted it to do.

Were you using Tow/Haul? If so that changes the shift patterns. Try running it in a lower gear to keep the RPMS up, will pull air through the radiator and trans cooler faster, and probably will eliminate your concern...

 

[Silentbob76]

im from ruidoso what roads you talking about

k
Seven Cabins off of pine lodge about 20-miles before you get into capaitan and by boy scout mountain

and a ranch near Santa Fe is where it got in the mid 200*'s

 

[Powerfuldodge]

I'm having an issue with high tranny temps since I installed the new Tranny. I ordered a BD tranny cooler yesterday ,I'm just going to mount it under the bed of the truck I'll let you guys know how it works. Right now my temps are 195-200 on the highway and around 205 in town

 

[Quadman]

Last weekend i towed my 16,000 pound toy hauler in 110 heat up a 6 percent grade, and I was on it hard and my tranny got to 190 and my motor got to 215. That is what my edge said, I have a 2007.5 6.7

 

[ruidosododge]

when I tow my dump trailer full of rock with total weight of 10-14000 lbs of weight around town in 100 degree weather my tranny never gets about 200 and thats towing with the smarty on sw3 all day long... everyones trucks run a little different though...

 

[slagburn]

The 5.9 / 48re combo uses a water to oil cooling arrangement in addition to the air to oil cooler - the 6.7 / 68rfe only uses a air to oil cooler thus the numbers on a 5.9 / 48re can't be used as a good baseline for the 6.7 / 68rfe.

 

[milo12]

High transmission temps at low speed is one reason I want an electric fan. You can manually switch it on if you want extra cooling. I never tow or haul heavy but I do like taking my popup camper on mountain trails.

I am also considering an auxiliary cooler for the trans and oil. But that may be overkill. But then again, I doubt you can have too much cooling.