DIY E46 & Z4 Ford 8.8 Kit
BMW E46 Ford 8.8 DIY Swap Kit
The ultimate drivetrain upgrade for the Ultimate Driving Machine.
This DIY package gives you the core components required to install an aluminum Ford Explorer 8.8 IRS differential into a BMW E46. You supply the differential and driveshaft, allowing you to choose the gear ratio, limited-slip differential, and driveshaft configuration that best suit your build.
For a more complete package that includes the differential and additional drivetrain components, see our complete bundle listing.
Included
- Legit TIG-welded Ford 8.8 swap subframe
- Choice of black powder coating or gold zinc coating
- Optional SLG/GForce axle assemblies
- Free domestic shipping available
Differential Compatibility
Designed for the independent rear suspension 8.8-inch differential found in:
- 2006–2010 Ford Explorer
- 2006–2010 Mercury Mountaineer
- A 31-spline carrier is required for compatibility with the included inner axle stubs.
Why the Ford 8.8?
The Ford 8.8 is one of the most proven and widely supported differentials available. The aluminum IRS housing is approximately 15 pounds lighter than the iron BMW M differential while offering significantly more aftermarket support.
A wide selection of gear ratios, limited-slip differentials, bearings, seals, and complete rebuild components is available from major performance retailers and local parts suppliers. This makes the 8.8 easier and more affordable to build, service, and upgrade than many factory BMW differential options.
Custom Subframe
The SLG subframe is designed and manufactured in the USA using detailed CAD models of both the E46 chassis and Ford differential. Each subframe is laser cut and TIG welded to maintain factory-level fitment and suspension geometry.
Features include:
- Factory suspension pickup-point locations
- Compatibility with standard E46 subframe bushings
- OEM-style chassis mounting
- Designed around the strength of the cast-aluminum Ford 8.8 housing
- Uses the differential housing as a structural member
- Requires an M3-style rear sway bar
SLG/GForce Custom Axles
The included axle package was developed to match the strength and capability of the Ford 8.8 drivetrain.
Each axle assembly includes:
- Billet, heat-treated outer wheel stubs
- Protective e-coated finish
- Custom ABS trigger wheels for factory-style ABS operation
- Upgraded 108 mm CV joints
- Billet inner axle stubs
- 31-spline Ford 8.8 differential engagement
The upgraded outer stubs replace the factory BMW M3 and 330 units, providing a much stronger connection between the axle and wheel hub. 330 or M3 trailing arms must be used.
Outlaw Axle Upgrade
The optional Outlaw upgrade is intended for high-power and competition applications requiring the strongest and longest lasting complete axle assembly available.
Outlaw features include:
- Upgraded billet internal components
- Isotropic-finished CV joint surfaces
- Reduced friction and operating temperature
- Improved grease distribution
- Reduced premature CV wear
- Premium ARP axle fasteners
The isotropic finishing process creates an extremely smooth, mirror-like surface that improves CV joint efficiency and durability under severe use.
Exotic Stub Upgrade
For maximum strength, select the GForce Exotic Stub Upgrade. These stubs are manufactured from a higher-strength material than the standard 300M components and are engineered to withstand the severe shock loads created during hard launches, drag racing, and high-power competition use.
Installation Requirements
- Requires BMW E46 M3 or 330 rear trailing arms
- May require clearancing of the upper control arm, depending on vehicle setup
- Requires an M3-style rear sway bar
- Customer must supply the Ford 8.8 differential
- Customer must supply or fabricate a compatible driveshaft
Installation Resources
Installation Instructions: [HERE]
Installation Video: [HERE]
Shipping Note
Because this package ships in multiple boxes, some international orders require a custom shipping quote. If checkout displays a message such as “product not available,” “not available in your region,” or a similar notice, contact us for a shipping quote and custom invoice.
Terms and Conditions
Due to the intended use of high performance products, Seems Legit Garage, LLC. ("SLG”) products and each part thereof, are sold "AS IS” and with all faults. To the fullest extent allowed by law, SLG Racing Products makes NO written, oral, expressed, or implied statement of warranty or guarantee on any product or part sold. SLG will not be liable for any direct, indirect, incidental, consequential, or special damages, including but not limited to, damage, injury, loss of life, loss of property or equipment, loss of profits or revenue, or claims from any individual or entity arising from the use of any SLG product.
RACING IS A DANGEROUS ACTIVITY AND PURCHASERS OF SLG PRODUCTS ACKNOWLEDGE THE INHERENT RISKS ASSOCIATED. SLG MAKES NO REPRESENTATIONS THAT ITS PRODUCTS CAN REDUCE OR ELIMINATE ANY SUCH RISK. SLG products are NOT FOR STREET, HIGHWAY, OR AIRCRAFT USE and are intended ONLY for race vehicles operated on closed-course facilities or race tracks with appropriate supervision of qualified technicians or mechanics to ensure that the safety needs of the race driver and others are met. SLG products could be combined with other products or parts which may not be suitable and could adversely affect performance of other race parts or the vehicle. The user shall determine the ultimate suitability and safety of the product for its intended use, and the user assumes all responsibility and risk in connection therewith.
Install Instructions
Click the Link for PDF: Link
