Transmissibility　is　used　to　assess　dynamic　responses　of　the　occupant-seat　system,　and　most　studies　have　exclusively　assessed　the　transmissibility　from　the　floor　to　the　cushion　or　the　backrest　surface　with　the　human　body.　In　this　investigation,　the　vertical　vibration　transmitted　from　the　floor　to　six　specific　locations　both　on　the　seat　surface　and　the　frame　when　the　seat　was　fixed　on　three　positions　on　the　track　was　examined　utilizing　an　SAE　J826　manikin　and　12　male　adults　(0.25　to　20　Hz)　for　a　duration　of　120　seconds　at　three　vibration　amplitudes.　The　transmissibility　from　the　floor　to　the　headrest　frame,　the　cushion　surface,　the　headrest　surface,　the　seat　back　frame,　and　the　seat　back　surface　all　exhibited　a　principal　peak　frequency　within　4-5　Hz.　With　the　exception　of　the　cushion　frame,　the　principal　peak　frequency　and　the　peak　transmissibility　in　transmissibilities　to　all　positions　decreased　with　increasing　vibration　amplitude,　indicating　the　non-linearity　within　the　occupant-seat　system.　It　was　also　found　modifying　seat　track　positions　minimally　affected　the　seat　transmissibility　to　either　the　surface　or　the　frame　of　the　seat.　Polyurethane　foam　amplified　vibration　at　peak　frequency,　simultaneously　enhancing　static　sitting　comfort　and　reducing　the　vertical　vibration　transmission　above　peak　frequency.