GM Turbo 400 TH400 Aluminum Tailhousing Without Bushing Almost 10% larger that stock

Almost 10% larger that stock intermediate piston

With an adjustable vintage plastic snapback closure

Speedmaster aluminum valve covers feature a classic raised

a rough-running

The key to a cooler and longer-lasting transmission is simple Speedmaster dual pass transmission coolers

GM Turbo 400 TH400 Aluminum Tailhousing Without Bushing Almost 10% larger that stockThese 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.