TCI 225105 Transmission Flex Band Reverse Kevlar Lined GM TH400 4L80E

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GM, TH400/4L80E, Reverse Kevlar (All)

Part # 225105

Transmission bands are thin steel bands that are anchored to a transmission’s case and enable gear selection and action.  Hydraulic transmission fluid provides the necessary force to activate these bands, which are also connected to servos. The servo mechanisms fill with the hydraulic transmission fluid in response to torque converter pressure, a process that results in the servos applying force against the bands, which then locks them into place around the transmission drums.

As all of this takes place, the flex bands allow gear action by forming a link between the transmission axle shaft and the transmission gears. Each individual transmission gear set has a corresponding set of transmission bands and drums that trigger transmission gear action. As the fluid flows out of the servos, the bands are disengaged and the entire process is reversed.