19590-010, YDGGM9.5-33-1 ** Fits GM 9.5" -28 spline -4-spring, clutch style positraction -Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth -Fully rebuildable -Assembled in the USA Technical Notes: DTA recommends the use of high grade GL-5 gear oil and Limited Slip Differential additive for long life and smooth operation. Part number OILADD or 43161. The use of synthetic oil is allowed but may result in aggressive or noisy operation. Direct fit for 2013 & down GM 9.5" rear (any ratio). The 2014+ GM 9.5" 12 Bolt rear has a carrier break, this case can be used with 3.23 & down gear ratios. (Requires aftermarket differential cover or modification to stock cover for 2014+) Direct fit for '03-'06 Chrysler 9.25" front, the 2007+ with OEM gears requires a ring gear spacer.This unit requires use of carrier bearing & race set number A42 (TIMKEN BRAND) which are included.