This is an aftermarket axle and spider gear kit for a Dana 80 with 37 spline axles and an open differential. These were common in later model F450 and F550 applications.

This is a genuine Dana/Spicer bare open differential carrier for 4:10 and up numerically, although this is compatible with Ford 3:73 ratio, because they use a thin ring gear. This replaces Dana part number 707230X. This is compatible with 35 or 37 spline axles.

This is a genuine Dana internal parts kit for a Dana 80 with a Trac Lok differental with 35 spline axles. This kit includes all internal parts including the clutch pack. These were found in 1999 and newer Dodge and Ford trucks. The new part number is 2003857.

This is a genuine Dana/Spicer loaded open differential for the M300 rear axle found in many 2017+ Ford F450 and F550 trucks with 41 spline axles. This is for gear ratios 4:10 and up. Here are some specifications from Dana’s website:   Brand Spicer Axle Model M300 Vehicle Location Rear Cover Bolt Quantity 14 Axle [...]

This is a genuine Dana/Spicer differential case kit that fits a Dana S135 or S150 drop out style 3rd member. This is for use with ratios between 4:78 and 5:38. This kit includes both case halves and the bolts that bolt them together.

This is a genuine Dana/Spicer internal kit for the Dana 44 rear differential in 2007-2017 Jeep JK’s. These are for non-Rubicon JK’s. These have 30 axle splines and are for an “open” differential. These do not fit a posi trac or limited slip differential.