tranny temp?

bobby5 · May 10, 2005

Whats your guys tranny temps not pulling anything and engine at full operating temperature?

jamashke · May 10, 2005

Before my tranny flush it would not move above 110 unless I was pulling up hill in 100 degree weather. Now there is something strange as my 01 and now my 04 did the same thing on both.

AFTER the flush my temps are going up to 150 emtpy and 200+ towing. Any rational behind that one? (the fluids are good, correct type, and "clean")

sxmax · May 10, 2005

Me too. Before my tranny flush and filter change it never moved. Now it sits about 150 just normal freeway driving...

Shaners · May 10, 2005

Both the 4L80E in my old 6.0L 2500HD and the Ally in my new truck would run about 140-150* when fully warmed up in nice weather.

jamashke · May 11, 2005

Anyone else have the issue of no tranny temp gauge movement and then after the flush it comes to life?

bdeboer · May 11, 2005

Anyone else have the issue of no tranny temp gauge movement and then after the flush it comes to life?

<{POST_SNAPBACK}>

I am seeing similar to your above temperatures, about 165 no trailer and just over 200 with a trailer on. Had the transmission flushed at 51000, and now have 58000 miles.

mmmikkke · May 11, 2005

Mine stays between 130 and 140 degrees driving country roads, 55 mph, a few stops now and then, 55 degrees ambient temperature.

ctfan · May 12, 2005

Mine stays at about 150 empty and unloaded. The truck has 63000 miles on it.

William

KurtMcMouth · May 12, 2005

I have an interesting twist on the topic. Mine stays at 150-160 on the highway and then goes to 190+ in stop and go traffic. I'm suspecting mine has a cooler issue.

weissmj · May 13, 2005

It may not be a tranny cooler problem (although the stock unit with the tow package is weak to say the least). It may be related to the airflow of the fan.

The Tranny cooler is about 3 inches away from the AC Coil. When Idling and towing, you've got quite a bit of heat to dissipate. The fan will cool the engine and AC because the shroud is fairly efficient and moving the air through them, and out from the fan; However, giving the distance from the Trans cooler and the AC, the airflow is substantially lower around the Trans cooler.

As a test, I had a high volume fan from an old computer and put it behind the Trans cooler, turned it on, hooked up the trailer and was in bumper to bumper traffic going up a moderate incline. The trans never got hotter than 185. When I disconnect the fan and returned back home it was well over 195 and climbing before I realized the problem wasn't the fan, but the distance.

Try that test, you'll be very surprised.

For me it was either purchasing a different aftermarket Trans cooler with an electric fan or purchasing a fan kit for the truck.

I opted for the Fan Kit for the truck.

Superman TNT · May 13, 2005

What is considered too hot? Where should it be? I've got an 8.1L w/ Ally.

KurtMcMouth · May 13, 2005

It may not be a tranny cooler problem (although the stock unit with the tow package is weak to say the least). It may be related to the airflow of the fan.

The Tranny cooler is about 3 inches away from the AC Coil. When Idling and towing, you've got quite a bit of heat to dissipate. The fan will cool the engine and AC because the shroud is fairly efficient and moving the air through them, and out from the fan; However, giving the distance from the Trans cooler and the AC, the airflow is substantially lower around the Trans cooler.

As a test, I had a high volume fan from an old computer and put it behind the Trans cooler, turned it on, hooked up the trailer and was in bumper to bumper traffic going up a moderate incline. The trans never got hotter than 185. When I disconnect the fan and returned back home it was well over 195 and climbing before I realized the problem wasn't the fan, but the distance.

Try that test, you'll be very surprised.

For me it was either purchasing a different aftermarket Trans cooler with an electric fan or purchasing a fan kit for the truck.

I opted for the Fan Kit for the truck.

<{POST_SNAPBACK}>

Hey, this is good feedback. This may very well be the case, especially since this all seemed to start right around the time when I lowered the truck. Perhaps I upset the balance of the system and it's not cooling as efficiently. I'll give this a shot. Thanks for the info!

KurtMcMouth · May 13, 2005

BTW, where'd you get a fan kit? Is it something that is focused on cooling the tranny cooler or a replacement fan for the engine or what?

AmericanMuscle · May 14, 2005

It's normal for the tranny to get hotter in stop and go traffic. Mine normally will get to 190* when I'm driving around town on a hot day (unloaded). In the same weather, my tranny temp will sit around 160-170* on the highway.

When I tow a heavy load, I normally don't see an increase in tranny temps. I think thats because the engine is usually not idling, which keeps the tranny fluid moving through the trans cooler.

The other day I was towing a heavy enclosed trailer when it was about 85* outside over large hills, and my tranny temp never broke 185*.

My 2004 was the exact same way.