The Yukon conversion spacer lets you install a Ford 10.25-inch ring-and-pinion set into 2008-and-up 10.5-inch Ford housings. Intended for 2008–2010 10.5" housings, the spacer and related shim guidance adapt the 10.25" gearset to the larger case, enabling use of the 10.25" ring and pinion without guessing fitment and preserving correct geometry when converting housings.
Yukon Gear Conversion Spacer To Use 10.25in Ring & Pinion in 08+ 10.5in Housing