The Dana 300 is largely considered one of the best transfer cases offered by Jeep. It comes of no surprise that people will want to use it outside of its original application. #52-2910 is a 31 spline input shaft to replace the original 23 spline input shaft on the Jeep Dana 300. Customers who typically purchase this input shaft are planning on utilizing the Dana 300 up against certain Ford transmissions with 31 spline output shafts. It should be noted this input shaft is normally sold in kit #PN50-9925 to mate the C6 and ZF 5 speeds to the Jeep Dana 300. The PN50-9925 kit also includes an adapter/spacer as is required for most applications. In the past, we have received a few requests for purchasing this input shaft separately.