Heating and Cooling› Oil and Fluid Coolers

ATS Diesel

ATS Allison Late Cooler Line Fitting Fits 2003+ 6.6L Duramax

$46.49

SKU: A00P 3140054272

Out of Stock
In Stock
Ships by Jun 14
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The ATS Diesel Performance Allison Late Cooler Line Fitting is a direct replacement component designed for 2003-2016 GM Silverado/Sierra 2500HD/3500HD trucks with the 6.6L Duramax engine and late Allison transmissions. This fitting ensures a secure connection at the transmission cooler line, helping to prevent leaks and maintain proper fluid flow.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandATS Diesel
Part NumberA00P 3140054272

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy