2020 GMC Sierra Transmission temp

[Clint Swonke]

Traded in my 2017 GMC Sierra for a 2020. Both have the 8 speed transmission 5.3 engine. I have noticed the trans temp on the 2020 is much hotter? The whole time I had my 2017 the trans temp never went over 185 pulling a trailer on 100' Texas days. The 2020 is running at 185 not pulling anything when its 80' outside..this normal for the new models?

[steve841]

Pretty much the same here ...  dont believe there's any issue.

 

I've never seen it go above 200 even towing for a distance.

[jnissen]

Ditto here. 190-200 loaded then drops to 180-190 unloaded. I’m running the 3.0L Duramax and that motor runs hot on purpose (210) so I figured that’s actually a good trans temp. Used to tow with a Honda Odyssey and that would easily get to 230+ degrees with the crappy OEM type of cooler. I installed A TruCool cooler on that van and it kept fluid under 200 then.

[MG386]

Different tranny, but just for comparison, my AT4 6.2/10speed, hottest I've ever seen it was going up a 7% grade pulling a 6k lb camper going 70mph at 112 outside temperature.
Engine temp got very high, but tranny never went over 185

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[ullose272]

Normal operating temp is around 200, its fine

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