Towing question/driving in general

[Zed 71]

I ran a Long Tru-Cool 30k on my tahoe and it was more than enough even with a higher stall converter, towing 6k with it and temps never broke 140-ish. Alot of people opt for the larger 40k model, but to me it is way overkill on an otherwise stock truck/suv.

InTruck, do you know what the acceptable tranny temps are? I have the OE tranny cooler and while towing seen temps up to 210.

 

[Zed 71]

Just found this on the interwebs...

"I was also concerned at one pointhowever and contacted GM with the question. There answer was: Good Morning! Thank you for giving me the time to do some research on your concern with the transmission temperature. I have consulted one of our dealers and am happy to inform you that I have the information you’ve requested. The normal operating temperature is between 160°F to 200°F (71°C to 93°C). For towing, the normal operating temperature is between 235°F (113°C) to 260°F (127°C). "

Towing temp seems high to me. I will try to confirm.

 

[TowGMC]

I was told by a GM engineer that one of the features of the Tow/haul mode is opening the trans cooler at an earlier temp. I never tow in D, I use Manual and leave the trans in 5th so it doesn't hunt all the time. It's the constant shifting that builds up the heat. This past weekend pulling my 6500 lb trailer home from MidOhio raceway into a 25mph headwind at 70mph my Denali never upshifted out of 4th. But in spite of the 65 degree air temps I never say more than 200 for trans temp. But I have seen 225 on hot summer days towing. If I don't trade for a Duramax I may install a second trans cooler from TransCool.

 

[Big Buttons]

Installing this= no more heat issues...



Tru-Cool 40K