Don't plug that bypass! STOP DELETING BYPASSES. Use Superior's SURE~COOL® STL010™ system TODAY!

Patented Protection US11725891B2 BEWARE OF counterfeits and fakes. STOP! Don't plug that bypass! Use this instead...
And ***beware of offshore counterfeits*** DEMAND SUPERIORS patented and patent-pending Sure~Cool STL010™, or STL020™ TBV Cooler~Flow Bypass safety systems.

Superior's Sure~Cool® STL010™ keeps the factory bypass working to your advantage, LIKE THE FACTORY INTENDED, Let Superior Transmission Parts, Inc. Show YOU...WHY YOU NEED to use our patent-pending SURE~COOL® safety system STL010™ Cooler~Flow™ bypass for the 6L80, 8L90 some Allison L5P 17-19.

IN YOUR GM TRUCK...our SURE~COOL® System is dynamic and active. The OEM VERSION is a static pellet that when stuck...from overheating (above 210 deg.), or metal/friction debris CONTAMINATION that sticks the pellet type, shutting off VITAL Cooler Flow. You might be saying, HELLO to AN EXPENSIVE REPAIR.
(Search GM TSB 21-NA-199)

SURE-COOL® Part# STL010™
Fits GM TBV BLOCKS on 6L series 6 sp. and 8L series GM 8Sp.
Sure~ Cool® STL010™ also fits the year models involved in the
TSB No. 21-NA-199 effecting model years
86774933 2016-2018 Silverado/Sierra
2019 Silverado LO/ Sierra Limited (steel lines)
85547828 Silverado Sierra 2500HD/3500HD 85563685
2019-2021 Silverado/Sierra (aluminum lines), Express/Savana
NOTE: New/ LATE OCT. 2021 thru 2023 10L USE SURE-COOL® Part# STL020™ in Block# 92457300

NOTE: the STL010™ Allows you to re-use the existing GM block and Lines
With TSB Bulletin No.: 21-NA-199 Date: December, 2021 TBV FAILURE Thermal Bypass Valve pellet stuck NO FLOW burnt transmission

An "already" "STUCK, plugged OR PURPOSELY BLOCKED" bypass WILL NOT CREATE A LUBE~LOOP™ BACK INSIDE THE UNIT and eventually WILL SMOKE YOUR UNIT due to blocked cooler flow and lube to the internals. WE have the FIX and its patent-pending, AND EASY TO INSTALL IN ABOUT AN HOUR.
Remember... It only takes...One Click & 1 Minute™ to view.

Made in the USA, Always!

[mrwhite]

I have a lot of units out there with plugged bypass valves. Not one ever has had any kind of issue. That includes many in very, very cold climates. The fluid is already thermostatically controlled by the coolant system. The same way that has been effective for the last 60+ years. Love the one you all have for the 6R80. I use one in every unit. But the GM 6L I'll continue with what has worked flawlessly for years.

[BigmikeE]

Just installed this today and what a difference. Thanks for the Chevy 6L80 fix .I also changed to a sonnax modified Billet torque converter

[vikkleo]

Just purchased mine thanks hope it works great

[christiankrejci]

So this product is safe for use in climates where it gets cold in the winter months? Say the midwest where it can get well bellow 0 degrees F. Would you have to allow time for the transmission to warm up in these cases?

[tomtonkin]

With the lower temperature’s does it effect any computer settings? Will everything else function as suppose to?

[frankieloco]

So I just added the mishimoto transmission cooler to my 2017 Chevy Silverado 1500 I wanna add your transmission bypass part kind of feel more comfortable with it since I’ll be in colder weather any advice.. what part # I need ?

[tlwayman]

How long does it take to heat up? I’m nervous about winter time. Running too cold isn’t a good thing either. I’m debating on buying this or the new updated colder thermostat from GM

[superiortransmissionpartsi]

Superior's SURE~COOL® STL010™ system is now patented accept NO counterfeits...the originals are now laser etched with the Sure~Cool Branding.