2013 GMC Sierra Transmission Temp?

[Tbos]

I have a 4.8 V-8 with a 4 speed auto transmission with tow haul mode. I have the towing package that includes a cooler. When I tow even in the fall weather the temps rise to about 170f. I'm towing a lightweight TT and combined gross weight is right about 10k which is the limit for the TV. In the Summer the temp went up to about 200. The fluid still looks and smells OK. Only have 12k miles on the truck. Engine temp runs at 212 all the time. What should my transmission temp read? When should I be concerned? Thanks.

[gepaine]

In the case of my GMC product, a 2007 Cadillac Escalade, transmission temp runs anywhere from 175 to 215 depending on the steepness of the grade, the length of the grade, and on the outside temp. I have seen 242 on one rare occasion. According to the service manager at the dealership, a warning light will come on "around" 250 (he "thought"), and if it rises much above 250, the engine will shut down. Bottom line: The service manager said I shouldn't be concerned.

I also heard someone say that he thought GM trucks "ran hot".

[JRTJH]

There is a lot of pertinent and good information in this thread:

http://keystonerv.org/forums/showthread.php?t=17767&highlight=transmission+temperature

(The SEARCH button is your "friend")

[ImTravis]

I have a 4.8 V-8 with a 4 speed auto transmission with tow haul mode. I have the towing package that includes a cooler. When I tow even in the fall weather the temps rise to about 170f. I'm towing a lightweight TT and combined gross weight is right about 10k which is the limit for the TV. In the Summer the temp went up to about 200. The fluid still looks and smells OK. Only have 12k miles on the truck. Engine temp runs at 212 all the time. What should my transmission temp read? When should I be concerned? Thanks.

I have a 2014 Silverado with 6-speed auto, and the tranny temp usually runs around 196 when warmed up.. with/without the trailer behind me. I was worried when it once bumped up to 203 for about 5 minutes, then dropped back down, and I've noticed it usually happens during heavy traffic (lots of stop and go), so haven't been concerned.

[Fishhawk]

FWIW

My GMC mechanic told me not to worry about trannie temps under 250

I've never seen my trannie temp get over 200
Maybe it does and I just dont know

I check the temp guage regularly throughout a trip
Especially on very hot days and driving in hilly country

[tirnanah]

I have a 2009 GMC Sierra 1500, and my tranny temp runs between 170 and 190 towing around 9500 lbs. I've only spiked it once and that was trying to push it backwards up a small hill next to my house (it's a steep rise beside my house and it was soggy wet that day :) ). The only temp that tends to spike on the truck is my oil temperature.

I have a edge monitor (not tuner!) that was worth it's price and then some for monitoring what's going on with the truck. I highly recommend it.

Thanks,
Doug

[Desert185]

FWIW

My GMC mechanic told me not to worry about trannie temps under 250

I've never seen my trannie temp get over 200
Maybe it does and I just dont know

I check the temp guage regularly throughout a trip
Especially on very hot days and driving in hilly country

Due to the radiator cooler configuration, turning the AC off can make a difference on a hot day if the tranny has a tendency to overheat. You probably know that, but I thought it was worth mentioning. One reason I like my NV5600 stick (with FAST coolers).

[Hansel]

I used my brother Chevy 2500HD with the Duramax, and when towing too Myrtle Beach this past summer the transmission temp never went over 192*. Outside temps where normal summer temps in the mid too low 90's, but I have a Ford F-250 Powerstroke and from a former transmission tech that work for Ford broke down the temps like this.

0-220* you are fine
220-230* good for 30 minutes of towing
230-250* only a few minute's
250*+ pull over a idle too cool down