GM Turbo 400 TH400 Aluminum Tailhousing with Bushing Upgrade your axle system and

Upgrade your axle system and experience improved performance and durability

and throttle bodies

They're 40 percent lighter

Speedmaster starter shim kits are designed to ensure that you have the proper gap between the starter and flywheel

This feature is sometimes called an air gap design

GM Turbo 400 TH400 Aluminum Tailhousing with Bushing Upgrade your axle system andThese 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.