Our 1057-3D converter established a benchmark for performance torque converters. Often referred to as the “McRat” it has set numerous records at the strip since its’ inception in 2005. Our #57 series incorporates a modified OEM stator and is coupled with the "Velocity Series" impeller. It allows good turbo spool-up with stock size turbos running mild tunes and also offers more efficient fluid coupling than our #56 converter. If you’re running the larger turbos and the wild tunes and need to spool see our #55, #58 or #59 series converters.

With the addition of the 1055, 1058 and 1059 to our Allison torque converter line we can accommodate any request in regard to stall, torque multiplication, efficiency, or other custom application. The stall test and RPM drops were tested with Stage V transmission, stock turbo with a 350HP tune, stock size tires in our 3500 dually. The example stalls and RPM drops are strictly to help you decide which may be best for your truck. Big tires without gear swaps will raise your brake stall test numbers.

Thanks for listening.

We would appreciate your feedback on your trucks performance with different gearing/tire and power combinations. If you care to share your results please respond to ron@suncoastconverters.com Use Stall Test Results in the subject line.

Core deposit required on converters.

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