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Mishimoto 12-18 Jeep Wrangler JK Transmission Thermal Bypass Valve Kit

Marsoni M251S
Sale price$155.19
Pay 4 payments of $38.80 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Mishimoto 12-18 Jeep Wrangler JK Transmission Thermal Bypass Valve KitThe transmission in your 2012 2018 Jeep Wrangler JK is the heart of its drivetrain. Whether you're hauling groceries or hitting the trail, it's vital to keep it performing at its best, and keeping the transmission fluid cool is crucial to that goal. In an attempt to balance driveability and the health of your transmission, Jeep fitted a thermostatic bypass valve to the lines that feed the transmission cooler. This valve ensures fluid doesn't flow
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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4.8 ★★★★★
Based on 2016 reviews
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4cams
Dallas, US
★★★★★ 5
OEM recommended.
Style: Mineral, Pattern Name: Quart - 1 Pack
It is the OEM recommended oil for my 2017 9.9 outboard. Arrived quickly and in a sealed plastic bag. No leaks. This is 32 oz and the motor only calls for 27 oz so enough for topping up in needed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2026
O
Verified Purchase
Ontik Hoque
Draper, US
★★★★★ 5
Great for Mercury 4-stroke outboard
Style: Mineral, Pattern Name: Gallon - 1 Pack
The price was too good to pass; I stocked up on 3 years' worth of oil. QuikSilver is OEM Mercury oil, and this stuff has long shelf life if you can store it in stable indoor temperature/away from temperature extremes. Great buy overall, highly recommended.
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Reviewed in the United States on June 20, 2025
J
Verified Purchase
Joe H.
Battle Creek, US
★★★★★ 5
Looks well made
Looks well made. Rubber seems pliable
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 15, 2026
D
Verified Purchase
Dct
Grantham, US
★★★★★ 5
It’s fixed
That awful boat… don’t buy boats unless you like to spend money OBVIOUSLY! This part fixed the boat!
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Reviewed in the United States on April 18, 2026
D
Verified Purchase
Don R
Waukegan, US
★★★★★ 5
Good
Good quality
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Reviewed in the United States on April 28, 2026

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