The TCI 400000 Trans-Scat valve body kit is a shift kit for 1966 to 1991 TH400 automatic transmissions. It is designed to deliver solid shifts and improve downshift and kickdown control while retaining full automatic operation in drive. By reducing transmission slippage and lag it provides a harder, more positive shift and allows manual downshifting on demand. With most setups the transmission can be held in first gear until an upshift is selected. For a TH400 Pro Super kit, see part number 228800.
- Type: Trans-Scat valve body shift kit
- Transmission: TH400, 1966-1991
- Function: Firmer, more positive shifts
- Control: Improved downshift and kickdown
- Operation: Retains full automatic operation in drive
- Part number: 400000
FAQ
What transmission does the TCI 400000 Trans-Scat kit fit?
It fits 1966 to 1991 TH400 automatic transmissions.
Does the 400000 kit keep the transmission automatic?
Yes. As long as the vehicle remains in drive it stays fully automatic, while still allowing manual downshifts on demand.
What does the Trans-Scat kit change about shifting?
It delivers firmer, more positive shifts and improves downshift and kickdown control by reducing slippage and lag.

