Heavy duty and high performance valve body calibration and  internal upgrades for General Motors TH 400 automatic transmissions.

Features:
  • Automatic shift
  • Street or full race
  • Holds 1st and 2nd to any RPM
  • Back-shifts to 2nd and 1st at any RPM
  • Tow&Go™ or competition
Also Includes:
  • (2) different size 1-2 shift valves
  • Direct clutch high rate return springs
  • Heavy duty intermediate pressure plate snap ring
  • 3rd clutch dual feed separator plate

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