HT3B Turbocharger 3529032 — Fourteen-Litre Cummins NT855 / NTA855 / NTA400 / NTC444 The 3529032 HT3B turbocharger assembly serves the fourteen-litre Cummins six-cylinder family badged NT855, NTA855, NTA400 and NTC444. One shared casting covers a wide ladder of release figures, so the outside of every unit looks the same while the compressor trim and turbine housing behind it differ by rating and by application. This page sets out how the figures relate, how the housing type