Prevent pressure drops in high RPM GM TH400 and Powerglide racing applications with this new, specially calibrated high RPM checkball capsule from Sonnax. Testing has shown that OEM checkballs in listed racing applications are unreliable above 5,500 rpm. At higher speeds the checkballs can unseat, resulting in drop of line pressure or converter pressure. There are many variables that effect che...

The driveline is often the last thing considered when jacking up power to extreme levels but a failure at the track is not the time to learn your slip yoke is the weak link. The new TH400 roller bearing slip yoke from Sonnax takes that worry completely off the table. Proven indestructible in track and street runs plus torture testing in the lab, you can confidently run colossal power from transmis...