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The new TCI® Heavy-Duty Input Shaft and Drum Assembly can now be purchased with an enhanced durability sun shell to deliver the ultimate in strength and performance. A common problem with 700R4 and 4L60E transmissions is damage to the sun shell and its inner gearing through harsh shifting or high torque conditions. Featuring a hardened input shaft, the assembly also incorporates a specially processed heavy-duty drum with a steel reinforcement ring, which is especially important for transmissions enhanced with raised line pressure to improve shift quality.

The TCI® Heavy-Duty Input Shaft and Drum Assembly is available in two versions: one for ’85-‘93 700R4/’93-‘97 4L60E transmissions and the second for ’98 and newer models 4L60E. Both versions are perfect for any race or high torque street application.