This B&M heavy-duty intermediate sprag for the TH400 eliminates failure due to excessive torque input. The 34-element sprag replaces the stock 16-element unit and increases the torque capacity by approximately 110%. This sprag is standard equipment in all B&M TH400 race transmissions and is a mandatory addition to any TH400 used in racing or heavy-duty applications. Requires 1965-69 TH400 clutch drum.