Brinn Inc.

Brinn Modified Transmission

  • Features

  • Brinn part number 70003
  • Designed for East Coast Modified race cars
  • Lightweight - 46.8 pounds without fluid
  • 10.85" overall length (bellhousing mounting surface to yoke center)
  • Open or closed drive option available
  • Reverse idler gear and low speed gear are NOT engaged in direct drive
  • The input and output shafts are gundrilled for reduced weight
  • Superior dog clutch design provides the most durability and the smoothest shifting available
  • Low cost - eliminates clutch assembly and throwout bearing assembly
  • Dog clutch and detent design eliminate the need for special shifters
  • Separate low and reverse gears make shifting precise
  • Designed for easy assembly, disassembly and service
  • SAE 10 tooth input shaft spline
  • Transmissions, parts, rebuilding and complete servicing readily available
  • Low gear ratio: 1.88:1
  • Reverse gear ratio: 2.29:1
  • Shafts and gears are cryogenically treated

  • What Makes a Brinn Modified Transmission Better?

  • Reverse Idler Gear

    The reverse idler gear is not meshed with any other gears when the transmission is in low gear or direct drive. Gears that are spinning when not needed rob horsepower and reduce acceleration.

  • Easy Shifting

    The Brinn Original Transmission requires you to only move a dog ring to engage direct drive or low gear. There are no gear teeth on the dog ring to engage with other gears. Shifting is quick and precise.

  • Fully Supported Countershaft

    The countershaft is fully supported by needle bearings on a hardened steel shaft. This improves rigidity and simplifies rebuilding. The countershaft and clutch assembly can be rebuilt on your workbench. A clip (supplied in the rebuild kit) is all that is needed to hold the assembly together when installing it in the case. No dummy shafts or c-clamps are required.

  • Removable Side Cover

    All of the shifting mechanism is built into the side cover. Removing the side cover also removes all of the forks, shift rods, detent springs and balls. Why rebuild the shifting mechanism if you just need to rebuild the clutch?

  • No Special Tools Required

    The Brinn Original Transmission can be rebuilt with standard shop tools, a pair of snap ring pliers, and a clutch assembly tool that is provided in the rebuild kit. There are no press fit bearings in the transmission. How much time would you save if you didn't need to press bearings?

  • No Need to Remachine Parts

    You will not need to machine any service parts when rebuilding a Brinn Original Transmission. All parts will fit the first time, everytime.

  • External Clutch Piston

    The clutch piston, pins, and housing can be serviced and/or replaced without opening the transmission. This saves you time if the clutch piston needs service.

  • No Welded Parts

    There are no welded parts in the Brinn Original Transmission. All parts are cast or made from billet. All parts are precision machined on CNC machining centers.

  • Cryogenically Treated Parts

    All critically loaded shafts and gears are cryogenically treated using the latest advances in cryogenic technology. Cryogenic treating produces stronger parts with increased durability. The direct drive/low gear dog ring is also shot peened to increase stength.