TransAction Shift Kit for GM TH350 TH350C 1969-1979 31006

Part Number: 31006

Upgrade the shift characteristics of a compatible GM Turbo Hydra-Matic TH350 or TH350C three-speed automatic transmission with this TransAction performance valve body kit.

Designed for compatible 1969–1979 TH350 and TH350C applications, this kit provides multiple configuration options for street, towing, off-road, strip, competition, and manual-control use.

Selectable Performance Configurations

Heavy Duty
Suitable for towing, off-road vehicles, RVs, work vehicles, trailers, and frequent stop-and-go driving applications.

Street And Strip
Provides firmer, more positive shift operation while retaining automatic transmission operation and passing-gear function.

Full Competition
Designed for dedicated racing and high-performance applications requiring maximum shift feel and control.

Manual Control
Allows manual low and gear control at any RPM when installed and configured according to the included instructions.

Kit Features

• Fits compatible GM TH350 and TH350C automatic transmissions from 1969–1979

• Reference number 31006

• Four selectable performance configurations

• Separator plates included

• Retains passing-gear operation in applicable automatic-shift configurations

• Adjustable shift-point setup

• Includes oil transfer plate intended to improve third-gear performance without transmission removal

• Designed for valve-body recalibration during transmission service or rebuild work

Important Fitment Note

Confirm your exact transmission model, production year, valve-body configuration, and intended performance setup before ordering. TH350 and TH350C transmissions can vary by application, and correct installation requires familiarity with automatic-transmission service procedures. This is a valve-body performance kit, not a complete transmission rebuild kit.

After installation, use the manufacturer-specified automatic transmission fluid and consider Lubegard ATF Protectant as part of your fluid service to help support smooth transmission operation.