Engines and Components› Engines, Blocks and Components

ATK ENGINES

CAD BW4479 TRANF CASE

$1,348.34

SKU: A040 X103-4

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Professional / shop required

Description

The ATK HP103 (equivalent to X103-4) is a Gen III 2003-2008 5.7L Hemi 400HP+ Crate Engine with MDS. This engine delivers 400 horsepower and 400 lb-ft of torque, an increase of 47HP+ over factory ratings. It features a bored 5.7L (345CI) block, 9.6:1 compression hypereutectic pistons, a Comp Cams Hydraulic Roller camshaft, and OE Hemi cylinder heads. An ECM tune is required for proper operation.

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

BrandATK ENGINES
Part NumberA040 X103-4

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