XDP | SKU: HVCD_XD396

X-TRA Cool L5P Transmission Cooler Thermostatic Bypass XD396 XDP

Name: X-TRA Cool L5P Transmission Cooler Thermostatic Bypass XD396 XDP
Brand: XDP
SKU: HVCD_XD396
Price: 79.00 USD
Availability: InStock

$ 79⁰⁰

Can I pick up my order or have it installed at your shop?

Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.

How do I know if this part fits my vehicle?

Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.

What if I need to return a product or it’s defective?

Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)

What's the lead time on custom or fabricated parts?

Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.

Description

X-TRA Cool L5P Transmission Cooler Thermostatic Bypass XD396 XDP

The XDP X-TRA Cool L5P Transmission Cooler Thermostatic Bypass XD396 is engineered for serious performance and reliability, specifically designed for the 2017-2019 GMC Sierra and Chevrolet Silverado HD models equipped with the 6.6L Duramax L5P engine. This innovative component is essential for maintaining optimal transmission temperatures and extending the life of your transmission.

This Part Fits:

2017 GMC Sierra 2500 HD
2018 GMC Sierra 2500 HD
2019 GMC Sierra 2500 HD
2017 GMC Sierra 3500 HD
2018 GMC Sierra 3500 HD
2019 GMC Sierra 3500 HD
2017 GMC Sierra 3500 HD Denali
2018 GMC Sierra 3500 HD Denali
2019 GMC Sierra 3500 HD Denali
2017 GMC Sierra 2500 HD Denali
2018 GMC Sierra 2500 HD Denali
2019 GMC Sierra 2500 HD Denali
2017 Chevrolet Silverado 2500 HD High Country
2018 Chevrolet Silverado 2500 HD High Country
2019 Chevrolet Silverado 2500 HD High Country
2017 Chevrolet Silverado 3500 HD High Country
2018 Chevrolet Silverado 3500 HD High Country
2019 Chevrolet Silverado 3500 HD High Country
2017 Chevrolet Silverado 3500 HD LT
2018 Chevrolet Silverado 3500 HD LT
2019 Chevrolet Silverado 3500 HD LT
2017 Chevrolet Silverado 2500 HD LT
2018 Chevrolet Silverado 2500 HD LT
2019 Chevrolet Silverado 2500 HD LT
2017 Chevrolet Silverado 3500 HD LTZ
2018 Chevrolet Silverado 3500 HD LTZ
2019 Chevrolet Silverado 3500 HD LTZ
2017 Chevrolet Silverado 2500 HD LTZ
2018 Chevrolet Silverado 2500 HD LTZ
2019 Chevrolet Silverado 2500 HD LTZ
2017 GMC Sierra 3500 HD SLE
2018 GMC Sierra 3500 HD SLE
2019 GMC Sierra 3500 HD SLE
2017 GMC Sierra 2500 HD SLE
2018 GMC Sierra 2500 HD SLE
2019 GMC Sierra 2500 HD SLE
2017 GMC Sierra 3500 HD SLT
2018 GMC Sierra 3500 HD SLT
2019 GMC Sierra 3500 HD SLT
2017 GMC Sierra 2500 HD SLT
2018 GMC Sierra 2500 HD SLT
2019 GMC Sierra 2500 HD SLT
2017 Chevrolet Silverado 3500 HD WT
2018 Chevrolet Silverado 3500 HD WT
2019 Chevrolet Silverado 3500 HD WT
2017 Chevrolet Silverado 2500 HD WT
2018 Chevrolet Silverado 2500 HD WT
2019 Chevrolet Silverado 2500 HD WT

Specifications:

Country of Origin: USA
Sold As: Each
Availability: Available
Universal: No

About XDP: XDP is a leading retailer, distributor, and manufacturer of top-quality OE, OER, and aftermarket diesel parts and accessories. Strategically positioned across the United States, XDP houses one of the largest and most diverse diesel-specific inventories in the industry. For the last 20 years, XDP has proudly served the diesel community and diesel industry across North America and Canada. We’re ready to meet the needs of you and your vehicle, whether it be for work, play, towing, or hauling. We know what moves you!

The XDP X-TRA Cool L5P Transmission Cooler Thermostatic Bypass XD396 helps lower temperatures and prolong the life of the Allison transmission in your 2017-2019 GM 6.6L Duramax L5P. From the factory, the L5P Duramax trucks are equipped with a transmission cooler bypass valve designed to provide quicker warm-ups in cold weather. However, failures in the field have proven that this factory design is unreliable and can cause excessive heat in your transmission.

The factory bypass valve restricts flow, and when the thermostat fails, it causes fluid to bypass the transmission cooler completely, resulting in elevated temperatures and premature transmission wear. With common performance upgrades, the issue is compounded due to increased pressure and heat.

The XDP XD396 Thermostat Bypass is a completely re-designed bypass block made from 6061 billet aluminum, removing the factory thermostat and allowing for unrestricted flow to the transmission cooler at all times. Enjoy up to a 50-degree drop in transmission fluid temperature with this innovative solution! This results in better cooling, reduced wear and tear, and can significantly extend your transmission's life.

Features: