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The TH400's claim to fame is its integrated center support. Its large center bushing cradles both the gear train and clutch packs, which provides excellent internal stability. The center support is critical to overall durability and longevity, since heavy-duty transmissions like the TH400 pack lots of rotating mass. Neither the Ford C6 or Chrysler 727 transmissions have a center support which, according to Phoenix, gives the TH400 a definite edge in strength.