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Game-Changing New TH400 Drum Upgrade from Sonnax
TH400 drag racers seeking a radical edge over the competition will get the total package of performance, consistency and safety with the new Smart-Tech® drum module from Sonnax. It’s the first and only Turbo 400 upgrade to deliver a big boost in transmission efficiency for more power to the ground, improved traction/stability on the shifts and unmatched protection against catastroph...
New TH400, Powerglide High RPM Checkball Capsule from Sonnax
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...
Sonnax Debuts Extreme Duty 4L80-E Input Shaft
The toughest GM 4L80-E input shaft ever made for 1,000+ horsepower vehicles is now available from Sonnax. It's an extreme duty shaft designed for extreme applications, when drivers want to go all out on the street or strip without worrying about transmission failure. The input shaft in the 4L80-E and 4L85-E is a weak point in these otherwise very capable units where both OE and aftermarke...
Tech Review Sonnax Smart-Tech Ratio-Style Servo Kit
By the FSC staff Photography courtesy of the manufacturer Whenever things go wrong, racers are always on a pass. Like a fisherman's tale of the one that got away, those mythical incomplete runs are favorite tales to tell around the pit when the racing action dies down for the night. While everyone enjoys a good story about what might have been, it makes for a much better story if your combin...
New Product Sonnax TH400 Slip Yoke for Big Power!
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...
New Product Sonnax 4R70W/AOD-E Smart Tech Drum Upgrade
Imagine racing a Ford with an automatic that can go head-to-head with the durability of a Powerglide, 400 or 4L80. Confidently running big power through AODE, 4R70W series transmissions is now a reality. Sonnax the most trusted name in transmission innovation is proud to announce the innovative new Smart-Tech direct clutch drum and shaft kit. Proven to handle even the most extreme torque and ...

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