RCV Performance Ultimate 300M CV Axles simply replace your GM Dana 60 U-joint axle shafts with a high-strength constant velocity design.  This kit is designed for custom length inners.  These axles are just as tough at a straight angle as they are at extreme angles - where U-joints are weakest. Ultimate 300M CV Axles also eliminate U-joint binding to allow smooth transfer power to the ground. Even if you have big tires and big power there are no worries.Ultimate CV Axles are low maintenance and operate with a smoothness you can feel - whether off road or on the street. And we back it all with a "No Questions Asked" limited lifetime warranty.Axle set includes 300M right and left CV axle shafts with full 300M CVs, 300M outer stubs, SST seals and installation tool, and RCV synthetic moly grease.Black oxide coating is standard. Optional nickel plating is available for extra corrosion resistance in salty environments. This kit is designed for custom inner axles.  The GM Dana 60 CV and is able to accept a 40 or 47 spline inner axle.  Please use our measurement guide HERE and also confirm using the guide in Attachment tab to get the proper measurements needed for your order.CVJ60M-GMP designed to work with GM outers.  ('77-'91)