Gearstar is your #1 source for high-performance transmissions and torque converters!

We sell automatic transmissions, custom-built and optimized with precision by master technicians, who are dedicated to engineering and building the finest. Whether you are looking for transmissions for Ford, GM, or Mopar, we have you covered! Transmissions that we feature are built as per the horsepower, torque, and rear gear ratio specs of the engine it is made for.Read More [+]TransmissionsWe have high-performance transmissions available for:

Ford – AOD (Level 2, 3 and 4), AODE (Level 2, 3 and 4), C4 (Level 2, 3 and 4), C6 (Level 4), E4OD (Level 3), 4R70W (Level 2, 3 and 4) transmissions.



GM - Turbo TH350 (Level 2, 3 and 4), Turbo 400 TH400 (Levels 2, 3 and 4), 700-R4 (Level 1, 2, 3 and 4), 200-4R (Level 2, 3 and 4), 4L60E (Level 2, 3 and 4), 4L65E (Level 2, 3, 4), 4L65E C5C6 (Level 4), 4L70E (Level 4), 4L70E (Level 4), 4L80E (Level 2, 3 and 4), 4L85E (Level 4).Mopar – NAG 1, 545RFE, TorqueFlite Chrysler 727 (Level 2 and 4)ConvertersWe have torque converters available for:GM Turbo TH200-R, 4L60E, 4L65E, 4L70E, 4L80E, 4L85E, 700-R4; Ford 4R70 W, 4R75W, AODE; Chrysler 545RFE; CH350/400; Mopar NAG-1, and more. Don’t forget to check out our YANK LT Power Adder, Pro Truck, Pro Thruster (PT), SS Series, and ZL1-2800 converters!How Gearstar is DifferentWhat makes Gearstar different from other transmission builders is our dedication to offer you the highest quality product. We strive to offer nothing but the best to our customers, which is why, when it comes to high-performance automatic transmission rebuild kits and converters, racers and car owners show their trust in us! Each high-performance transmission/converter offered by Geastar is built by “one technician” from start to the finish. Before the products reach you, they are dyno-tested for the equivalent of 100 miles to ensure that they offer the best performance metrics.Our Transmissions Are Warranted!All our performance transmissions, remanufactured transmissions are warranted against failure—due to workmanship and/or parts used in the remanufacturing process—for 3 years or 36,000 miles, whichever comes first from the date of shipment.