WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket

Easy to install, works very well. Mtransmission stays much cooler and shifts better under heavy load.

I received my product and installed it the next day. Very simple to install. Instructions are easy to follow and so simple. Great fit, great value for the money and no leakage at all. Once installed my temperatures dropped by 40 degrees. I was running at 205 degrees, I am not running between 150 and 167 degrees. This is amazing. I am not having any durability issues at the moment. I recommend this product to anyone who is having a transmission heating issues or overheating issues.

fit my 2017 GMC Sierra with the 6‑speed exactly as it should. Everything lined up properly and installation was straightforward. It also does what it’s supposed to do as my transmission fluid temps are noticeably lower after installing it. This version includes the gasket, which isn’t strictly required, but it really should be replaced when removing and reinstalling the system. Buying it as part of the kit is cheaper than sourcing the gasket separately. Solid setup and well worth it.

Works as described and instructions included. This replaces the thermostat in the factory housing for a GM 6L80. Lowered my trans temps substantially. You will need basic tools and snap ring pliers.

Must have, the change in temperature was immediate after install, extremely easy to install, transmission feels smoother, instructions are very clear but if you feel more comfortable there's videos on this aswell, worth every penny.

Works great. Highly recommended. Easy to replace

Easy to use and do it use self!

Pulling a 6000# trailer with my 1500, tends to make the transmission fluid run hot, especially with a stock transmission cooler thermostat that doesn’t open until 194°. Was recommended this product to lower the temp and make my new transmission last for years. Watched several videos and people were saying it takes 10-30 minutes for this install. I’m currently in a cast, and considered it a challenge! It did take me closer to the 30 min mark, but was super easy to do, even 1 handed. Temps dropped 40-50° at highway speeds and 20-40° for city driving (in 94° summer heat). Will see how well it works this weekend while pulling our camper. Fantastic product, just wish I would have known about it years ago - could have saved my factory transmission and $5k to replace it!

Easy to install. Does what it says. Max running temp 71°C uphills with a heavy right foot. Previously 91°C

Excelente producto ya se le instaló a mi camioneta y funciona de maravilla muchas gracias por tener este tipo de refacciones

Easy to install by yourself Transmission temperature used to be at 130 C in a 30 minute mountain pass in 20 C weather. Now its 100 C in the same mountain pass and 30 C weather. Also, transmission temperature will go back to 85 C after 20 minutes of normal driving.

Excellent product. Did exactly what it was purchased for.

Bueno se lo instale a una silverado 2019 con transmision 6L80 pero veo que no es mucha la diferencia en la temperatura