This includes a brand new 1,2,3 gear and a brand new input shaft with 4th gear and a new cluster shaft. get the $150 rebuild kit including bearings, syncro's and small parts, and upgrade your existing t5 to z spec for about $600 out the door. this is $700 cheaper than a brand new z spec, and when you are done, almost everything is new. (get the hanlon how to video, he is how I learned!!)