6L80 6L90 8L90 Sure Cool System Upgrade STL010

Excellent. Not difficult to change and makes a HUGE difference in the transmission temperature of my truck especially on long mountain trips. I highly recommend it. Great value and well manufactured.

Works as stated, easy install. Replacing the existing GM thermostat internals that don’t seem to provide much flow even after they open. This part opens up the flow and dropped my temps from 197 to 153 average on a hot day. 2017 Silverado 5.3

Okay, I have an 8 speed transmission in a Chevy Silverado. This product has reduced my make temperature by more than 30 degrees. Greatly improved the first gear hard down shift issue I am experiencing. Installation was easier than changing the oil in a vehicle. Highly recommend this product

I was running 200-220F hot summer temps (Florida) when I bought my 2018 5.3L Suburban high-mileage used in 2021. I did see a reduction into typical 190s temps, maybe breaking 200 on hot days with a lot of shifting, after doing a fluid evac and replacement. But this device is the REAL DEAL that dropped my temps. I can't get the thing to go over 170F NO MATTER WHAT I DO.Now, because the fluid is running through the cooler CONSTANTLY, it only gets anywhere above 155F if I'm sitting in traffic on a hot day and moving slowly without much air reaching the trans cooler. But as soon as I'm back up to speed, especially highway speeds, the temps start dropping and it's not unusual to cruise at just below 150F on the highway with good air flow.I am 100% certain I have just saved, or at least prolonged, the life of my torque converter. If you have a 6L80 this is as important a thing as you can do for it, and it only takes half an hour with extremely basic tools. Most complicated thing you need is snap-ring pliers that squeeze together (not the one that expands).This is every bit as important with these trucks as an AFM disabler to preserve your lifters, and, frankly, this is a more certain fix than the AFM disabler offers. GM has acknowledged that 190-220F is way too hot for your torque converter in a TSB release, but their "fix" is another thermostat that can freeze shut. This fix allows flow even if everything inside the device fails - the default is open flow to the cooler and worst case, in very cold climate in winter, you might need an extra couple minutes of morning warmup. In most of the country, you just leave it so that it's always open - the check-ball lets it clear out any overpressure from one side or the other so there's no harm that can occur.Just a BRILLIANT solution!!!BTW, my PHOTO shows the HIGHEST TEMP I have been able to reach since installing, and driving in warm weather - average daytime outdoor temp here is 80F. To get it up to 169F as shown in photo I had to run it at high revs in 1st gear in stop-and-go city traffic on a blistering day. That's the max I can get it up to now, and it takes a lot of trying! As soon as I hit the highway, or just 45mph in the city, that temp backs down into the 150s quickly.

This works great with my 2020 Silverado with the 8 speed. Just took it on a beat run on the highway and temps didn’t exceed over 155 degrees from the normal 180 that it’s been running at during the summer. Shifts feel great and the transmission doesn’t feel like it’s being slammed into the next gear. If you got about an hour and a half to take off the cooler lines and a pair of snap ring pliers, definitely consider spending the $50 for this minor upgrade.

Perfect temp at 160 degrees after driving 1hr mixed between stop and go and highway .2018 chevy silverrado LTZ with 81,000 miles .. The installation is a breeze .I had it done in 45 mins .This product is highly recommended just buy it and get er done Cowboy country Texas ..My transmission was showing me an emoji smiling on my radio display ..

Why did you pick this product vs others?:installed on my 2014 Silverado transmission temps are waaaaaay better not 199 running around 157 to 167

Easy install, ease of mind on temps/ there is free ways to do this (flipping the pin) but I wanted a good product with good reviews so I didn’t have to worry about it. Took 20 mins max to install. Temps were hitting 200+, now I’ve only seen it hit 150. Also went ahead and changed my fluid since the old was burnt.