E30/Z3 Ford 8.8 DIY Kit
SLG DIY Ford 8.8 Swap Kit for E30 / Z3M – Build It Your Way
Take the hard part out of your E30 8.8 swap with our complete DIY E30 8.8 Conversion Kit.
This kit gives you all the heavy fabrication pieces—engineered, jigged, and ready to install—while letting you choose your own differential, axles, and accessories. Perfect for builders who want the performance of our full E30 8.8 bundle, but with more flexibility and a lower entry cost.
Designed for E30 and Z3M models using the larger 5-lug Z3M trailing arms (BMW PN: 33322227967 & 33322227968), which offer the largest factory spline interface and the strongest foundation for high-power axles.
Checkout Note (Important for International Buyers)
If your cart shows “product not available” or “not available in region,” just reach out. This kit ships in multiple oversized boxes, and international freight often requires manual quoting. We’ll send a custom invoice with accurate shipping.
Domestic U.S. orders still ship free.
What’s Included
Gloss-black powder-coated custom steel subframe
Weld-on rear differential mount plate
Diff bushings
Quad eccentric camber/toe adjusters (OEM-style cam bolts)
Complete diff mounting hardware
Kit Overview
Why the Ford 8.8?
This kit utilizes the 2006–2010 Ford Explorer/Mountaineer IRS 8.8" differential; hands down one of the best differential platforms for performance builds.
Benefits include:
~15 lbs lighter than BMW M iron-case differentials
Massive aftermarket support (gears, LSDs, rebuild kits, billet components)
Inexpensive, widely available, easy to service
Proven to hold extreme torque and abuse in drag, drift, road racing, and street builds
Minor grinding of the top of the diff casting may be required in some chassis for height clearance but is strictly cosmetic and does not affect strength.
Subframe Details
Our custom steel subframe is built to OEM geometry with major strength upgrades:
CNC-bent & laser-cut
Precision jig-fixtured TIG welds
Powder-coated gloss black
Full camber & toe adjustment using included eccentrics
CAD-designed to maintain original suspension pickup points
Manufactured proudly in the USA (Welded by Fresh Produce Mfg.)
The included rear differential mount plate welds directly to the chassis and is significantly stronger than OEM—distributing load more efficiently and preventing fatigue or cracking even under high power.
Optional Axle Packages
If you want axles, we supply the strongest options available for BMW platforms—built to pair with the 31-spline Ford 8.8.
SLG / GForce Axles
Proven in high-power drag, drift, and road-race applications
ABS trigger wheel included for factory-style integration
Billet 31-spline Ford 8.8 inner stub included
One of the strongest BMW axle solutions on the market
Outlaw Axle Upgrade
Billet alloy internals with isotropic surface finish
Reduced friction, heat, and wear
Improved grease migration for smoother CV operation
Premium ARP fasteners throughout
The strongest performance axle package available for E30 applications
Exotic Stub Upgrade (Ultimate Strength)
Outer stubs machined from an ultra-high-strength alloy exceeding the capabilities of 300M
Designed specifically for extreme shock loads and drag-style launches
The go-to choice for customers pushing the absolute limits of the chassis
Why Choose the SLG DIY Kit?
Removes the most difficult fabrication steps
Uses the strongest OEM trailing arm option (Z3M)
Provides adjustability your OEM subframe never had
Supports insane power levels while maintaining OEM-like drivability
Modular—buy only what you need, build the rest your way
Backed by SLG’s years of proven racing and product experience
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.
