Sure Cool System Upgrade STL010 w/ Bypass Gasket

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!

worked great. easy install and brought my temp down drastically

If you pull a trailer, have a constant load, live in a warmer climate, or just want your transmission to last longer, I recommend this device. Especially for the price. Very easy installation for the driveway DIYer. I installed on a 2015 GMC Sierra 5.3l with a 6l80 NEW transmission that I had to replace at ~84kmi. Normal temp on stock valve opens at 194*F. This modification keeps the temps well below that and circulates the fluid all times. One thing to note, the little bracket that holds the cooler lines to it is ONE WAY. It looks symmetrical at first glance but is very slightly offset. The holes will not line up if not the right way. I have driven across the country and it has kept temps below 160 while moving. I also have a constant weight as I am a full time overlander. I haven’t tested in the extreme summer temps yet but no matter what, it will keep the transmission running cooler.

hands down works really well. Easy install! Dropped my Trans temp +20deg on average. From 190deg f down to 165deg f daily driving. Instructions were really clear. Great kit.

Works fine on new transmissions. Easy to install after yiu disassemble the original oem thermocouples cartridge use air pressure and ice to open original before installation.

Cold days you’ll get a check engine light for transmission temp out of range. Too cold for too long.

2015 Silverado 5.3 the tranmission was staying at 196 degrees. After the install of this part the temperature stays are 145 degrees. Instructions inside the box where very helpful. Only took 15 mins from start to finish.

Worked great and not to bad to install. Helped lower the transmission temp.