Overhaul - 200-4R: Description

The Turbo Hydra-Matic 200-4R transmission is a fully automatic unit consisting of 3 major components: 3-element torque converter (with a torque converter clutch), compound planetary gear set and an overdrive unit.

Friction elements used in this transmission include 5 multiple-disc clutches, 2 roller clutches and a band.

A hydraulic system, pressurized by a variable capacity vane-type pump, provides working pressure required to operate friction elements and automatic controls.

Fig 1: Cutaway View of Turbo Hydra-Matic 200-4R Transmission

Courtesy of GENERAL MOTORS CORP.

NOTE: For information on converter clutch system used in the THM 200-4R, see GENERAL MOTORS TORQUE CONVERTER CLUTCH article.