


Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve KitThe Allison transmission is the backbone of your L5P Duramax. It's responsible for transmitting large quantities of torque from your V8 diesel powerplant. This torque generates a lot of heat, and if that heat isn't dissipated, it can destroy your transmission. The transmission cooler does a good job of keeping trans fluid temperatures in check, but only if the fluid can reach it. The stock cooling system of the Allison 1000 transmission utilizes an in
Quick Dispatch:
Your Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit ships.
Need Help?
Questions about Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit, sizing, or delivery? We're just an email away.
Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit in your area.
Get Shipping Estimates
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
You may also like
4.1 ★★★★★
Based on 853 reviews
Sort
Product Reviews
★★★★★ 5
Boys Will Be Boys
Got this for my grandson and not only did I love it but he also looked so good in it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
★★★★★ 4
True to size
Color: Black, Size: 8
I loved the Material of the suit
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 9, 2025
★★★★★ 5
Bar
Color: Navy, Size: 18
Quality of suit was exactly as shown on line. Fits great.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
★★★★★ 5
Fixed perfectly.
Color: Light Blue, Size: 14
I bought this for my 12yo son, worked perfectly! I definitely recommend it!
He's 5"2 ,almost 98 pounds
I ordered size 14.
Great quality!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
★★★★★ 5
Nice 4 piece suit!
Color: Light Blue, Size: 10
The suit fit nicely. The back of the pants were a little baggy, but I adjusted the waistline with the sewn in elastic. I just needed to hem them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 8, 2026
recommand products
Generac Generator Part - 120221 - SHOULDER SCREW, QUANTUM (691653)
11.00
Generac Generator Part - G064585 - SHRINK TUBING .50ID BLK ADH
12.74
Generac Generator Part - 374400 - SHIELD, BLOW BACK, CPR, CP4, 21
154.00
Generac Generator Part - 10000022444 - SHIM (+0.20MM)
14.07
Generac Generator Part - 247381 - SHIFT LINKAGE 12.5 HP PREMIER FBM
17.95