FD 8.8 - Complete IRS Kit w/ Standard Axles (uses Ford Inner, Mazda Outer CVs)
FD 8.8 IRS, Complete Differential Mount Kit w/ Standard Axles
The Standard version of our FD 8.8 here-in is our simplest FD rear end offering and mates Ford Inner CVs to FD outer CVs using custom axle shafts. The outer CVs will be reused from your FD, if you prefer not to tear down your existing axles to donate parts you can also consider our Grande option which doesn’t need Mazda parts.
Why run Ford 8.8 diff? It's a powerhouse, substantially stronger than the factory Mazda rear end and is supported by wide range of gear ratios and LSDs. We specifically utilize parts from a 2006-2010 Ford Explorer for their strength, reliability, and availability. Our kit maintains factory like exhaust clearances.
The FD 8.8 Standard Complete Kit includes:
• Front Mount Support Bridge (weld in)
• Rear Mount Diff Ring Cradle (bolt on)
• 4x Mazda Subframe Reinforcement Gussets (weld in)
• 2x Custom 4340 heat treated axle bars (Ford to Mazda conversion)
• 2x EMPI CV boot kit 86-2127 (outer CV joints)
• 2x EMPI CV boot kit 86-2215 (inner CV joints)
• All Mounting Hardware
• RTV silicon (for rear cover installation sealing)
• Instructions (hosted online)
Users Will Source Their Own:
• Ford 8.8" Rear End (2006-2010 Ford Explorer) complete center section that uses the dual front pinion support.
• Ford 8.8" inner CV joints (from 2002-2010 Ford Explorer axles). Note donor axles must be OEM, not aftermarket or OEM equivalent. Typically this means sourcing used axles from a junkyard or eBay, not just the local parts store.
• Mazda FD outer CV joints (usually from the car being modded)
• A Driveshaft (installation instructions offer various recommendations)
• FD rear diff isolators (your choice of style, but we recommend polyurethane)
A few FD specific notes: The dual front mount for the 2006-2020 Explorer is a stronger load path, but the kit is compatible with an Explorer 2002-2005 single front mount diff if required. The FD kit will eliminate the Mazda Power Plant Frame (PPF), so if you’re still running a 13B a dedicated transmission mount will be required. Bonzai’s transmission mount brace is one such option and can function as a stand alone. Our engine subframes and transmission mounts work perfectly for many other combinations.
Performance and Durability.
How much power will it hold? We typically recommend the standard version for anyone making up to 600 whp. More than that (or drag racing / drifting) we recommend you consider our Grande version for increased capacity. Regardless, all Ronin shafts come with a warranty support program so if you do break one we can get you a replacement at reduced cost (see https://roninspeedworks.com/pages/axle-warranty-support for full details).
Elevate your performance with the Ronin FD 8.8 Standard Complete Kit