---
product_id: 625792236
title: "Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket"
brand: "wit whatever it takes transmission parts, inc"
price: "VT27465"
currency: VUV
in_stock: true
reviews_count: 5
category: "Wit Whatever It Takes Transmission Parts, Inc"
url: https://www.desertcart.vu/products/625792236-superior-6l80-6l90-8l90-sure-cool-system-upgrade-stl010-bypass
store_origin: VU
region: Vanuatu
---

# Fits 6L80/90 & 8L80/90 transmissions Reduces operating temps by 20% Built-in safety bypass valve Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket

**Brand:** wit whatever it takes transmission parts, inc
**Price:** VT27465
**Availability:** ✅ In Stock

## Summary

> ❄️ Keep your ride cool, calm, and unstoppable with WIT’s Sure Cool System!

## Quick Answers

- **What is this?** Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket by wit whatever it takes transmission parts, inc
- **How much does it cost?** VT27465 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/625792236-superior-6l80-6l90-8l90-sure-cool-system-upgrade-stl010-bypass)

## Best For

- wit whatever it takes transmission parts, inc enthusiasts

## Why This Product

- Trusted wit whatever it takes transmission parts, inc brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-Inclusive Upgrade:** Includes premium bypass gasket for a complete, reliable cooling system overhaul.
- • **Instant Fluid Accuracy:** Check fluid levels immediately without waiting for warm-up cycles—precision meets convenience.
- • **Stay Cool Under Pressure:** Slash transmission temps by up to 20% for peak performance on every drive.
- • **Plug & Play Compatibility:** Seamlessly fits all 2014+ 6L80/90E and 2016+ 8L80/90E models—upgrade without hassle.
- • **Extended Transmission Life:** Reduce overheating risk and boost ATF longevity for fewer maintenance headaches.

## Overview

The WIT WHATEVER IT TAKES Superior Sure Cool System Upgrade (STL010) is a cutting-edge transmission cooling solution designed for 6L80/90E and 8L80/90E models. Featuring a patented bypass valve and included gasket, it reduces operating temperatures by up to 20%, enables immediate fluid level checks without warm-up, and extends transmission fluid life by minimizing overheating risks. Lightweight and easy to install, it’s the smart upgrade for millennial professionals who demand reliability and peak performance from their vehicles.

## Description

Includes Bypass Gasket Fits all 2014-up 6L80/90E AND NOW FITS 8L80/90E 2016-up Superior’s Cooler Flow bypass valve kit with TransLab’s patented and patent pending Flow~Control cooler bypass technologies allows full time cooler flow and lube to parts “so you’re not hot under the collar”…you’re SURE~COOL

Review: Excellent product. Did exactly what it was purchased for.
Review: 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.

## 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 | #46,201 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Transmission Gaskets |
| Brand | WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC |
| Customer Reviews | 4.8 4.8 out of 5 stars (394) |
| Date First Available | 6 March 2024 |
| Item Weight | 130 g |
| Item model number | STL010 |
| Manufacturer | WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC |
| Manufacturer Part Number | STL010 |
| Model | COOLER FLOW BYPASS |
| Product Dimensions | 10.16 x 10.16 x 2.54 cm; 130 g |

## 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

### ⭐⭐⭐⭐⭐ Review
*by C***V on 24 December 2025*

Excellent product. Did exactly what it was purchased for.

### ⭐⭐⭐⭐⭐ Review
*by A***A on 29 September 2025*

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.

### ⭐⭐⭐⭐⭐ Review
*by C***D on 20 July 2025*

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!

## 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

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**Shop now:** [https://www.desertcart.vu/products/625792236-superior-6l80-6l90-8l90-sure-cool-system-upgrade-stl010-bypass](https://www.desertcart.vu/products/625792236-superior-6l80-6l90-8l90-sure-cool-system-upgrade-stl010-bypass)

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-12*