--- product_id: 611226387 title: "Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket" price: "340.57 DT" currency: TND in_stock: true reviews_count: 13 url: https://www.desertcart.tn/products/611226387-superior-6l80-6l90-8l90-sure-cool-system-upgrade-stl010-bypass store_origin: TN region: Tunisia --- # 20% cooler operation Immediate cooler fill Built-in safety bypass Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket **Price:** 340.57 DT **Availability:** ✅ In Stock ## Summary > ❄️ Keep your transmission chill while others overheat! ## Quick Answers - **What is this?** Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket - **How much does it cost?** 340.57 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/611226387-superior-6l80-6l90-8l90-sure-cool-system-upgrade-stl010-bypass) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug-and-Play Upgrade:** Includes bypass gasket for seamless installation and instant reliability. - • **Instant Fluid Accuracy:** Check fluid levels immediately—no warm-up wait, no guesswork. - • **Stay Cool Under Pressure:** Slash operating temps by up to 20% for peak transmission performance. - • **Overheat? Not on Your Watch:** Built-in safety bypass reduces risk of costly transmission overheating. - • **Boost Transmission Longevity:** Lower temps mean extended ATF life and fewer maintenance headaches. ## Overview The WIT WHATEVER IT TAKES Superior Sure Cool System Upgrade STL010 is a precision-engineered transmission cooler upgrade compatible with 6L80, 6L90, and 8L90 models. Featuring a built-in safety bypass and immediate cooler fill, it reduces operating temperatures by up to 20%, extends ATF life, and allows instant fluid level checks without warm-up. This upgrade includes a bypass gasket for easy installation, making it a must-have for professionals seeking reliable, high-performance transmission maintenance. ## Description Buy WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket: Transmissions & Parts - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Do this to save your transmission - This thing is great. My valve died so my transmission overheated heavily and as soon as I swapped this in it has never overheated. Went from running at 200+ to never being above 185. My 2018 gmc 1500 6L80 has never been happier and neither have I. This product saves you thousands on repairs and takes 5 mins to install. Only this you need to be aware of is it requires you taking a little c clip snap ring out which you need a set of snap ring pliers for to make it easy. Ran to AutoZone and grabbed them for 10 bucks. I got away with using picks and assorted tools from my garage to get it out but you probably will give up and need the pliers to put it back in. Great product Review: A must need product if your transmission is getting hot - 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. ## Features - Built in safety bypass Immediate cooler fill. - Immediate accurate fluid level check without warm-up cycle - Reduced average operating temperatures by as much as 20% - Reduced risk of overheat while under load, Increased ATF life. - Includes Bypass Gasket ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CV6RDK5V | | Best Sellers Rank | #5,262 in Automotive ( See Top 100 in Automotive ) #32 in Automotive Replacement Transmissions & Parts | | Brand | WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC | | Customer Reviews | 4.7 4.7 out of 5 stars (578) | | Date First Available | February 7, 2024 | | Item Weight | 4.6 ounces | | Item model number | STL010 | | Manufacturer | Superior | | Manufacturer Part Number | STL010 | | Model | COOLER FLOW BYPASS | | Product Dimensions | 4 x 4 x 1 inches | ## Images ![Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket - Image 1](https://m.media-amazon.com/images/I/61jMu20b8ZL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Do this to save your transmission *by C***. on July 20, 2026* This thing is great. My valve died so my transmission overheated heavily and as soon as I swapped this in it has never overheated. Went from running at 200+ to never being above 185. My 2018 gmc 1500 6L80 has never been happier and neither have I. This product saves you thousands on repairs and takes 5 mins to install. Only this you need to be aware of is it requires you taking a little c clip snap ring out which you need a set of snap ring pliers for to make it easy. Ran to AutoZone and grabbed them for 10 bucks. I got away with using picks and assorted tools from my garage to get it out but you probably will give up and need the pliers to put it back in. Great product ### ⭐⭐⭐⭐⭐ A must need product if your transmission is getting hot *by D***R on May 11, 2026* 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. ### ⭐⭐⭐⭐⭐ If your keeping your silverado you need this *by A***L on August 26, 2026* So far so good! Went from 200+ temps in regular traffic to not over 175, great for preserving the life of the silverado transmission. Couple min to install, snap ring pliers from harbor freight $5, and a 13 socket is all you need. PS , helps to install the line rings into place on the bypass before installing back on the truck so the lines just pop back in when you insert them ## Frequently Bought Together - WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket - atp automotive B-239 Automatic Transmission Filter Kit for GM Optional 6L80 Heavy-Duty 6-Speed Transmission - ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid - 1 gal --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/611226387-superior-6l80-6l90-8l90-sure-cool-system-upgrade-stl010-bypass](https://www.desertcart.tn/products/611226387-superior-6l80-6l90-8l90-sure-cool-system-upgrade-stl010-bypass) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-10-12*