TH400 Forward Drum & Input Shaft Upgrade Options

Presented by Sonnax

GM TH400 racing applications quickly push the heavy, cast-iron OE forward drum over its limits. To dramatically reduce weight and deliver the ultimate in reliability, Sonnax offers heavy duty forward drum 34554-01 — a high-strength, chromoly steel upgrade just 3 oz. heavier than a common aluminum drum. This video breaks down all the race-ready features in this unique transmission part, plus the heavy and extreme duty input shaft options for a complete Sonnax build.

Related Units

Related Parts

Required

Recommended

TH400

Heavy Duty Forward Drum 34554-01

Required

Recommended

TH400

Heavy Duty Input Shaft 30280-02

For use with turbine support bushing in converter.

• Shaft Material: 300M
• Shaft Dia.: 1.000"
• Front Spline Tooth Count: 30

Required

Recommended

TH400

Heavy Duty Input Shaft 30280-01

For use without internal turbine support bushing in converter.

• Shaft Material: 300M
• Shaft Dia.: 1.000"
• Front Spline Tooth Count: 30

Required

Recommended

TH400

Extreme Duty Input Shaft 35280-02

For use with turbine support bushing in converter.

• Shaft Material: 300M
• Shaft Dia.: 1.125"
• Front Spline Tooth Count: 35

Required

Recommended

TH400

Extreme Duty Input Shaft 27280-02

For use with pumps converted for a 27-spline, 1-3/16" shaft configuration.

• Shaft Material: 300M
• Front Spline Tooth Count: 27
• Journal Dia.: 1.188"

While Sonnax makes every effort to ensure the accuracy of technical articles at time of publication, we assume no liability for inaccuracies or for information which may become outdated or obsolete over time.