GM TH400 Heavy Duty Racing Transmission Billet Aluminum Direct Drum Speedmaster manufactures these master cylinders

Speedmaster manufactures these master cylinders from quality materials to ensure proper fitment

Speedmaster has designed these main cap girdles to reinforce the alignment of the main caps in high performance applications and counter the limited webbing and weaknesses of those stock blocks

Note: This item is all missing gaskets

If the fuel pump is putting out more than 8 psi

high-tech styling

GM TH400 Heavy Duty Racing Transmission Billet Aluminum Direct Drum Speedmaster manufactures these master cylindersThis TH400 Billet Aluminum Direct Drum is manufactured specifically for drag racing but also makes a great replacement for the hard to find OEM parts. Drum weights 55% less than the OEM drum. Made from 7075 T6 Billet Aluminum, 36 element Pro Mod Sprag and new large steel outer race to allow the use of more clutches. Used in applications up to 3000 HP.