My 727 has a harmonic vibration in it in park when you rev the engine its comes in around 1500 RPM, I have a spare box that I want to build but I want to built it bullet proof, bolt in sprag, extra clutch discs HP bands and so on, is there a one stop shop over there that is a friend of CC.com that will sell me a complete rebuild kit that is a tuff as nutts kit so as my trnas will take all sorts of hammering please.