Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit

Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit

Marsoni

M251S

$99.95

Get it in 3 business days with 1 day shipping. Friday, May 29

Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve KitSKU: MMTC L5P TBVFF UPC: 840197710609 Mishimoto 2017+ GMC 6. 6L Duramax L5P Transmission Thermal Bypass Valve Kit Upgrade your 2017 2021 Chevrolet Silverado 2500 HD 3500 HD and GMC Sierra 2500 HD 3500 HD with L5P 6. 6L Duramax using the Mishimoto full flow thermal bypass valve kit. This direct fit replacement eliminates the stock thermostat that fails and blocks fluid flow to the cooler causing overheating. Experience constant transmission cooling for

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Reviewed in the United States on October 10, 2025

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Omaha, US

★★★★★ 5

Good stuff

Size: 5 Fl Oz (Pack of 1)

Not greasy. Goes on easily.

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Size: 5 Fl Oz (Pack of 1)

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Reviewed in the United States on July 17, 2025

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Pawtucket, US

★★★★★ 5

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Reviewed in the United States on June 2, 2026

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