GM Turbo 400 TH400 Aluminum Tailhousing with Bushing This feature is sometimes called

This feature is sometimes called an air gap design

The Speedmaster block is ready for the street racer or all-out racer with added strength and cubic inches

Switch out your weak and thin factory retainer plates with Speedmaster heavy-duty bearing retainer plates and make your ride a lot safer

improving handling and reaction times

Upgrade your axle system and experience improved performance and durability

GM Turbo 400 TH400 Aluminum Tailhousing with Bushing This feature is sometimes calledThese Speedmaster tailshaft housings are designed to fit the stock Turbo 400 transmissions. They are five times stronger and more ridged than stock because they are made from aircraft grade aluminum alloy. Featuring thicker walls and more gusseting than any other manufacturer.