some kind of sprag that goes in the tranny. Nothing more then a pin for the clutches or something. But its known to break under heavy loads so you upgrade it with what they call a "super c sprag" :bsflag: and APPARENTLY or so they claim. when it breaks you lose the 1st gear in drive UNLESS you manually shift it out. (yes I am completely goin off what the guys who apparently didnt make it as bulletproff as they claimed are telling me)

And yes Virgil I was welcomed to this world the FIRST time I had the tranny built... then it reminded me when my rear blew... then it slapped me again with this...