Are you planning on hauling something with this..??? Unless your uhhhhhhhh plannin on haulin a big load in the bad mountains or something you dont need the 10 speed... sounds like youll have enough power with just the 5 speed spicer that was hooked to it....???? Unless ya just like shiftin.. or split shiftin...... or even the 5 speed with a two speed rear end... or better yet get an allison....