Transmission Fluid options?

[Grumpy Bear]

1 hour ago, 2017Silverado22 said:

Do you have a link for the write up? Was it a newer model?

Not the information I though it was, Sorry. Jon changed the water stat and fan settings but that alone wont get you to 160 F. 

[Black02Silverado]

5 hours ago, 2017Silverado22 said:

Would the AMSOIL ATL be a better fluid than the Redline mentioned above? As far as locating it, I have every major parts store around. Autozone, O Riley’s, Advance, Napa. Assuming one of those guys carry it?

I have no experience with Redline ATF.  I have been using AMSOIL since 2000 and feel it is a high quality product.  I use it in everything I own. AMSOIL stands behind their product with their own warranty.  Their Signature Series ATF/ATL fluid is a full synthetic fluid which holds up well to heat and keeps the transmission cooler and cleaner inside.

[Z45]

I have used AMSOIL ATF in every GM vehicle I have owned since It improved the performance exponentially.   Its in my 2017 GMC Sierra Denali CC Ultimate 6.2L/8-sp. 

[Bayvalley]

On 2/4/2020 at 5:41 PM, 2017Silverado22 said:

Anyone have any recommendations for a better trans fluid than what comes from the factory? Is there anything else out there that is a better option? My 2017 Silverado has the downshift clunk when it downshift about 50% of the time. Never an up shift clunk, always down and usually when braking harder. What I’ve noticed is that it don’t do it until the trans gets above say 160 degrees. When I first jump in it, it shifts smooth as silk for the first 30 miles or so until the tranny gets hot. After that point, the downshift clunk 50% of the time begins. Never had tranny fluid messed with. 49k miles currently. Any advice appreciated.

Those model years have defective Torque converters for the 8/4 cylinder deactivation. GM is aware and has not found a solution. My 2015 GMC Sierra failed at 80,000 miles on a trip and we were stuck in South Carolina for a week having it replaced. The master transmission tech at the GMC repair center told me to expect it to go out again since GM's vendor for that torque converter has not designed a solution. GM issued a notice to all owners recommending replacing the transmission fluid every 40,000 miles. Unfortunately, this is a solution only delays the failure which benefits GM if owners can get past the 100,000 mile warranty period.