If you are upgrading your Dana 300 from a stock 26-spline front output shaft to a 32 spline, you need to bore out your input retainer to fit the upgraded larger shaft.

For customers that are not able to do this on their own, or do not have access to a machine shop, Behemoth Drivetrain offers bore out service for these retainers.  The service works for both the Behemoth Drivetrain model 32-spline shaft and the JB Conversions 32 Spline front output.

Simply purchase the bore out service on this product listing, and ship the retainer along with your order confirmation to Behemoth Drivetrain at 609 Salt River Road Leitchfield KY 42754.

We set aside one week per month for bore services, so we can do them in a batch to help keep your cost down.  Once complete the Behemoth team will ship the upgraded and newly bored retainer back to you, and you are ready for install.