GM LS series engines 1997 up, dished 6 bolt internal balanced 168 tooth works with TH 350, TH 400, 700R4, 4L60E, 4L80E. Meets requirements for SFI 29.2 certification, built from premium billet forged steel for ultimate strength, precision balanced, and a black epoxy painted finish for corrosion resistance. Recommended for vehicles up to 3500hp and max. Engine RPM of 12,500rpm. Please e-mail with questions.