Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-18-2016, 07:56 PM   #15
Rivet Master
 
1996 25' Excella
Tillsonburg , Ontario
Join Date: Aug 2014
Posts: 694
240F (steady running temp) is enough to kill a tranny in 20,000 miles. Even high temps of under 200 will still shorten the transmission life. If you hit alarm levels for a short period then cool off you won't do much damage to the tranny but the oil will breakdown and then the tranny will suffer. Pull the dip stick and smell the oil if it smells burnt then change it. I have a 22000 BTU cooler on my Dakota 4.7 with 5 speed trans. I come off any highway run with the oil at under 120F. I've got 220,000 Km on it and the oil looks new when I change every 50,000 Km. Install as big a cooler as you can fit and you will save your transmission and your sanity. And change the oil now, it is already compromised!
JCW.
__________________

__________________
JCWDCW is offline   Reply With Quote
Old 07-18-2016, 08:17 PM   #16
Agent 86
 
J. Morgan's Avatar
 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 4,364
Images: 11
It seems consensus among many members here is to "trust the engineers",,,,,, except regarding transmission overheat.

#JustSayin...


My opinion is kind made known in the above statement. Which is,,,,, relatively short temp spikes as denoted in the lead post are not going to hurt much if any at all with modern synthetic trans fluid.

Don't freak out.


Gradiens super tenui glacie.
__________________

__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 07-18-2016, 09:25 PM   #17
4 Rivet Member
 
chaseav's Avatar
 
2015 25' FB International
Join Date: Nov 2014
Posts: 429
Avalanche with 5.3L (with tow package and trans cooler) regularly hit 220 range but never exceeded 230. Several thousand miles towing this way. Escalade with 6.2L has yet to exceed 195 degrees. OAT's in both cases above 90 up some pretty major hills. Slow down, let it shift into higher gear; sometimes mine ran better with lower trans temps in 3rd as opposed to 4th. Higher engine RPM's don't mean higher trans temp. Took me a while to understand that correlation. Oh, and the 6.2L gets 13.25mpg as opposed to the 5.3L's 9mpg. Go figure! The right TV makes all the difference.
__________________
chaseav is offline   Reply With Quote
Old 07-18-2016, 10:51 PM   #18
jcl
Rivet Master
 
Currently Looking...
Vancouver , British Columbia
Join Date: Oct 2012
Posts: 721
Quote:
Originally Posted by chaseav View Post
Higher engine RPM's don't mean higher trans temp. Took me a while to understand that correlation.
Agreed. Frequent shifts, and the torque converter not in lock up mean higher transmission temperatures. If a lower gear keeps the torque converter locked up, you are much better off.
__________________
jcl is offline   Reply With Quote
Old 07-18-2016, 11:07 PM   #19
4 Rivet Member
 
2017 26' Flying Cloud
Granbury , Texas
Join Date: Aug 2014
Posts: 281
I noticed pulling my Pendleton up mountain passes or just running the freeway the transmission temp was way lower if I manually shifted to 4th gear and left it there. I am using scan guage to monitor temps. The rpm's were a little higher but not screaming high and locking out 5th and 6th seemed to help a bunch temp wise. Never saw anything near your highs. This is on a 2016 Toyota Tundra with tow package. 38 gallon gas tank, built-in brake control and 4.56 rear factory drive. The Tundra is an amazing tow vehicle. I did add Timbrens to the rear axle to help prevent sag. Works great. And yes...your trans temp is too high.
__________________
cabinetmaker is offline   Reply With Quote
Old 07-19-2016, 04:36 AM   #20
CLOUDSPLITTER Phone home
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 10,802
Images: 1
Quote:
Originally Posted by J. Morgan View Post
It seems consensus among many members here is to "trust the engineers",,,,,, except regarding transmission overheat.

#JustSayin...


My opinion is kind made known in the above statement. Which is,,,,, relatively short temp spikes as denoted in the lead post are not going to hurt much if any at all with modern synthetic trans fluid.

Don't freak out.


Gradiens super tenui glacie.
^
X2

But what do I know....with only 40yrs in auto service.

Bob
__________________
"What you do speaks so loudly, no one can hear what you say"
M. Levy




So when is this..."old enough to know better" supposed to kick in?
ROBERT CROSS is offline   Reply With Quote
Old 07-19-2016, 07:11 AM   #21
Slide Out Society #001
 
GCinSC2's Avatar
 
2007 30' Classic S/O
Somewhere , South Carolina
Join Date: Apr 2010
Posts: 1,710
I'm in the minority and granted this ain't helping the OP but my 6 speed manual doesn't suffer from this problem. I pull that I-77 grade from NC to VA Fancy Gap yearly too. Fifth gear and enjoy the pull.

OP good advice to watch out for excessive trans temps.
__________________
S/OS #001
2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Carslile Actuator, Equal-i-zer, Dill TPMS. Campfire cook.
GCinSC2 is offline   Reply With Quote
Old 07-19-2016, 07:40 AM   #22
Rivet Master
 
Denis4x4's Avatar
 
2006 25' Safari FB SE
Currently Looking...
Durango , Colorado
Join Date: Feb 2006
Posts: 1,093
I had the same issue with a 2012 at 950 miles. Had to be flat bedded to the dealer. I insisted that the transmission pan be dropped, filter changed and fluid replaced. During that process, the techs discovered a kinked line to the cooler and replaced it. Never trusted the truck after that and took a beating when I traded it in.
__________________
If you don't go first class, your heirs will!
Denis4x4 is offline   Reply With Quote
Old 07-19-2016, 09:11 AM   #23
2 Rivet Member
 
2000 34' Limited
1985 25' Sovereign
LaGrange Highlands , Illinois
Join Date: Jun 2016
Posts: 58
I have been towing for forty some years. have had a trans go out with 213,000 miles on it and was happy at that millage, nothing last forever. Temp at 200-215 is not to bad but with a add on trans cooler U can keep the trans oil much cooler. The cooler the better it is. hot oil breaks down fast. Cool oil will last a long time and will not break down as soon as hot. Coolers R inexpensive and a good investment to save yr trans. As for power on Yr Denali, it has plenty of power for that trailer. Remember going up a steep hill can slow U down but going down U will go as "fast" as anyone else. Good luck
__________________
rmatkovich is offline   Reply With Quote
Old 07-19-2016, 09:23 AM   #24
CLOUDSPLITTER Phone home
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 10,802
Images: 1
Question

Quote:
Originally Posted by rmatkovich View Post
The cooler the better it is. hot oil breaks down fast. Cool oil will last a long time and will not break down as soon as hot. Coolers R inexpensive and a good investment to save yr trans. .....
False....it's much better to keep the temp in the recommended range .
In fact most quality coolers will have a cold weather bye-pass valve to insure quicker warm-up temps.

Bob
__________________
"What you do speaks so loudly, no one can hear what you say"
M. Levy




So when is this..."old enough to know better" supposed to kick in?
ROBERT CROSS is offline   Reply With Quote
Old 07-19-2016, 10:41 AM   #25
jcl
Rivet Master
 
Currently Looking...
Vancouver , British Columbia
Join Date: Oct 2012
Posts: 721
Quote:
Originally Posted by ROBERT CROSS View Post
False....it's much better to keep the temp in the recommended range .
In fact most quality coolers will have a cold weather bye-pass valve to insure quicker warm-up temps.

Bob
Agreed. My factory transmission cooler on the X5 utilized engine heat to warm the transmission fluid on cold starts, as the engine warmed up much faster than the transmission. The circuit was designed to reduce accelerated wear on cold start, and improve shifting performance.

Jeff
__________________
jcl is offline   Reply With Quote
Old 07-19-2016, 12:43 PM   #26
4 Rivet Member
 
1991 25' Excella
Stanfield , Oregon
Join Date: May 2016
Posts: 310
Quote:
Originally Posted by rmatkovich View Post
I have been towing for forty some years. have had a trans go out with 213,000 miles on it and was happy at that millage, nothing last forever. Temp at 200-215 is not to bad but with a add on trans cooler U can keep the trans oil much cooler. The cooler the better it is. hot oil breaks down fast. Cool oil will last a long time and will not break down as soon as hot. Coolers R inexpensive and a good investment to save yr trans. As for power on Yr Denali, it has plenty of power for that trailer. Remember going up a steep hill can slow U down but going down U will go as "fast" as anyone else. Good luck
You want your transmission fluid to run 180-200 degrees and synthetic fluids dont break down tell after 240 degress for an extended time. If your temps are lower that that your wasting efficiency
__________________
SpletKay06 is offline   Reply With Quote
Old 07-19-2016, 01:41 PM   #27
2 Rivet Member
 
abqdor's Avatar
 
2016 25' Flying Cloud
Albuquerque , New Mexico
Join Date: Aug 2015
Posts: 44
OK, here's where I am to date having started this thread. Lots and lots of opinions here about transmission temperature. I have also done the following:
  • Emailed "socialmedia@gm.com (about tranny temp range and at what temperature the alert light goes on....no answer yet)
  • Had transmission fluid checked for discoloration or odor (no issues found)
  • Talked to GMC service tech who showed me that an auxilary cooler would be hard to squeeze in
  • Talked to Airstream service mechanic who felt that ambient temperature and steepness of hill was definitely the contributing factor
  • Spoke in person to another Airstream owner who was towing a 30 ft. Airstream with an '05 Yukon XL and felt my Denali was plenty for a 25' FB
  • Talked to a reputable transmission shop who said they could find a way to put an auxilary cooler in, but said I probably wouldn't see much of an improvement over the factory set up that was already in the Denali tow package

Two simple things I've learned that I didn't do, but should have:

1). Turn off the air conditioner when temps go up. Go so far as to turn on the heater to distribute engine heat which will bring engine temperature down, which will bring radiator temperature down, which will help bring transmission temperature down.

2). High transmission temperature is acceptable for short periods of time. When it gets that hot, stop and idle the engine. Do not turn the engine off thinking you will cool things down faster. The synthetics can generally handle these high temps for short periods.

I'm sure there will be some different opinions, but I feel pretty good about the advice I've been given and am thankful for all the input.
__________________
'13 GMC Yukon Denali 6.2L V8
abqdor is offline   Reply With Quote
Old 07-19-2016, 09:28 PM   #28
4 Rivet Member
 
chaseav's Avatar
 
2015 25' FB International
Join Date: Nov 2014
Posts: 429
I commented having not read the OP. What I wrote still seems relevant but I'd like to add this. My TV is a 2015 Escalade with 6.2L engine. It's essentially the same vehicle as yours but I wasted a bunch of money on higher trim grade. That engine is massive and it whips around my 25FB. Up steep hills through VA and WV and I monitored the trans temp the whole time. Tons of power, no weird shifting and I swear the temp never crossed 200.

My feeling is that something is up with your transmission or something is really making it over work. Maybe the transmission in your year model was insufficient for that big of an engine? Drive it till it drops, or make the upgrade. In my humble opinion, non-factory mods installed by people who haven't done dozens of them before seldom bring positive results.
__________________

__________________
chaseav is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Transmission Temp too high? Silver Threads Tow Vehicles 19 05-10-2007 12:04 PM
2 way or 3 way Refrigerator? New or Old? prairieschooner Refrigerators 10 09-13-2006 09:45 AM
What is 2 way vs 3 way fridge? Astrodokk Refrigerators 12 06-01-2005 03:33 PM
1977 20ft Argosy Transmission Temp? fabofabo Airstream Motorhome Forums 10 09-09-2004 07:17 AM
Recs for Transmission Oil Temp Guages docbluedevil Mechanics Corner - Engines, Transmission & More... 6 10-31-2003 05:31 AM


Virginia Campgrounds

Reviews provided by



Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:36 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.