Ford Super 8.8 IRS 3.91 Standard Gear Set US Gear – Produced in USA

Part Number: RS07888391-15US

For 2015-2020 Mustang
• Fits 3.31 & numerically higher carrier
• Super 8.8 IRS Only
• Will not fit other Ford 8.8 rear ends

Standard Gears are the perfect choice for replacement of OEM gear sets
Providing long service life in Street, Street / Track, & Oval track vehicles

These gears can also be used in some Drag Race cars depending on weight & power
If tooth breakage occurs, then a larger rear end will become necessary

Machined From 8620 Forged Steel
Heat Treated to Maximize Gear Life
Matched Ring & Pinion Set

Ring Gear
• 8.8″ OD
• Tooth count 43
• 10 bolt holes
• M12-1.25 bolt holes

Pinion
• 30 spline shaft
• Tooth count 11