What is the Best Temperature for Transmission Fluid on a 2010 Chevy Avalanche

Updated 10/21/2026 | Published 08/02/2013

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Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class IV - Efficient

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Question:

What is the re commended transmission temp suppose to be in a 2010 Chevy avalanche while pulling a tralier with 3 ATVs on it about 3000 pounds

asked by: Regina W

Expert Reply:

Regardless of whether you are towing anything or not you will want the transmission temperature to be between 160 to 200 degrees F. Towing a trailer or carrying more weight in the truck will increase the temperature. Since transmission fluid cannot be over cooled I do recommend adding one to your 2010 Chevy Avalanche. Keeping the temperature as cool as possible will extend the life of the transmission.

You can use cooler # D13504 that you have referenced. To avoid having to cut and flare lines I also recommend the hose fitting # D13035.

I have included a link to our FAQ article on transmission coolers and a link to a video showing a typical installation for you.

expert reply by: Michael H

Elias

10/21/2026

For an error I put one quart of motor oil in the transmission on my Chevy avalanche what do you think can affect

Lazer S.

10/21/2026

@Elias DO NOT drive anywhere with motor oil in your transmission!!!! I honestly wouldn't even start it at this point. This will cause the trans to slip, mess up shifts, and potentially cause catastrophic transmission failure. GM transmissions are already a weak point and with this being in there, you kind of magnified that. I usually say not to do this as it really isn't good for the trans, but you are going to need to flush it out and replace all the fluid with ATF. I would honestly have a trusted mechanic shop do this and I would have the vehicle towed there.