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Drivetrain› Drive Shafts and Components

Ford Performance

Right Side Half Shaft Assembly

$1,440.00 $1,231.32 Save $208.68

SKU: M-4138-M

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Ford Performance M-4138-M is a right-side half shaft assembly designed for Mustangs. It is CNC-machined from aerospace high-alloy materials and features billet one-piece stub ends with 34-spline inner and 32-spline outer configurations. The axle shafts are engineered with anti-wheel hop technology.
Show original supplier description
The Ford Performance M-4138-M is a right-side half shaft assembly engineered to revamp your Mustang with enhanced performance and durability. Constructed from CNC-machined aerospace high-alloy materials, this assembly features robust billet one-piece 34-spline inner and 32-spline outer stub ends. The axle shafts are specifically designed with anti-wheel hop technology to improve launches and overall traction. This half shaft is designed to support up to 1,500 horsepower, making it a suitable upgrade for performance-oriented Mustangs. It serves as a direct replacement for the production right-side half shaft assembly and utilizes severe-duty, serviceable CV joints. Compatibility for this assembly includes all 2015-2025 Mustang GT and EcoBoost models, as well as 2024-2025 Mustang Dark Horse models. It also fits all 2015-2020 GT350 models. It is important to note that this part does NOT fit 2020+ GT500 models.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandFord Performance
Part NumberM-4138-M
CategoryDrivetrain

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Returns & Fitment

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.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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