Protect your investment and prevent catastrophic transmission failure with the ATS Billet Thermal Bypass Valve Insert. Engineered specifically for the 2019-Current 3.6L Jeep JL Wrangler / JT Gladiator and 2024-Current 2.0L Jeep Wrangler equipped with the 850RE 8-speed automatic transmission, this simple drop-in upgrade fixes a dangerous factory flaw before it costs you thousands in repairs.
The OEM thermostatic valve in the TorqueFlite 850RE 8-speed automatic transmission is prone to sticking in the closed position. When this valve fails closed, it completely blocks automatic transmission fluid (ATF) flow to the transmission oil cooler / heat exchanger. With nowhere for the heat to go, your transmission will quickly overheat and internally cook itself.
To make matters worse, the factory transmission temperature warning light won't illuminate until your fluid reaches 240°F—a temperature high enough to cause rapid fluid breakdown, clutch slippage, and irreversible internal gear damage. Worse yet, Chrysler does not sell the factory valve as a standalone replacement part; fixing it through the dealer requires purchasing the entire cast aluminum heat exchanger housing.
The ATS Thermal Bypass Valve Insert eliminates the failure-prone factory mechanism, ensuring continuous, unrestricted fluid flow to and from your transmission cooler. By maintaining proper ATF circulation, this upgrade noticeably lowers operating temperatures, protects your torque converter, and preserves long-term shifting performance.
Stock Jeeps are already vulnerable, but extra stress compounds the heat fast. If you run larger off-road tires, tackle steep rock crawls, or regularly tow trailers and haul heavy cargo, your torque converter works near capacity and generates extreme heat. Under these high-demand conditions, instant transmission fluid cooling isn't just an improvement—it is critical to survival.
Installing the ATS Billet Thermal Bypass Valve Insert is a straightforward job you can perform right in your garage or driveway using basic hand tools:
Fitment Note: Please verify your vehicle's setup prior to ordering. Review the photos in the ATS instruction guide and visually inspect under your Jeep to confirm your transmission is equipped with this thermostatic valve assembly.
ATS Transmission packages carry a standard THREE YEAR Warranty. There are several exceptions, so refer to the Warranty’s specific terms and conditions . All labor, shipping, or any other charges associated with the product and the product’s failure are not covered under Warranty. Labor and/or shipping charges will not be refunded under any circumstance. After the one-year anniversary date of the original purchase, there is a limited parts replacement Warranty only. Transmissions that are purchased separately outside of a transmission package / stage and are installed without an ATS torque converter carry a 1 year parts only warranty and there is no labor or shipping allowance for transmission only purchases.
In the event of a product failure, the consumer must return the defective product to ATS for inspection before a replacement is sent to the consumer. After ATS inspects the product and completes the failure analysis, the inspection officer at ATS will provide written documentation stating the condition of the product and determine, to the best of his or her ability, what caused the malfunction or complaint. Based on the findings of the inspection report, ATS will determine whether there is a valid Warranty claim. Should a consumer require immediate service, and chooses not to wait for their product to be returned to ATS for inspection, service, and potential repair or replacement, the consumer can purchase a replacement product from ATS. The consumer must pay the full current MSRP, the applicable core charge, and shipping to and from ATS’ shop. When the defective product arrives, ATS will refund the core charge and inspect the product. During inspection, ATS will assess the product for warrantable damage. If the original product has indeed failed under the terms of the original Warranty, ATS will refund the full purchase price for the replacement product only. If the product has failed due to any issue not covered under the original Warranty, ATS will assess charges to the consumer based on any parts necessary to return the product to nominal ATS standards. ATS will deduct the total cost of required parts from the replacement product’s purchase price, and the consumer will be refunded the difference (if any) between the purchase price paid for the replacement product and the cost of parts.
If the consumer can wait for their product to be returned to ATS for inspection, service, and potential repair or replacement, the consumer pays shipping to and from ATS’ shop. When the defective product arrives in Colorado, ATS will inspect the product. ATS will then assess the product for warrantable damage. If the product has failed under the terms of the original Warranty contract, ATS will repair or replace the product – at ATS’s discretion. If the product has failed due to any issue not covered under the original Warranty, ATS will assess charges to the consumer based on any parts necessary to return the product to nominal ATS standards. ATS will bill the consumer for the total cost of parts required for repair of the product, and shipping to and from Colorado, prior to the repaired/replaced product being sent to the consumer.
This section incorporates Section 2, entitled “In the Event of a Failure.” ATS manual transmissions carry a 1-year/12,000 mile Warranty. ATS will not pay for any fluids replaced in the event of a transmission failure. There is no labor or freight warranty coverage on standard transmissions. Manual transmission shafts and gears are not covered by this Warranty on any transmission due to the capability of certain situations to cause stress-loads beyond the structural ability of the shaft or gear.
