400 (3L80), AT-540, Buick 350, Chevy 350, Powerglide, Powerglide, 350, 400 (265mm) Performance Converter

265mm Performance Converter Kit
Part No. GM-RK-305

View Instructions

Sonnax 265mm performance converter kit GM-RK-305 for GM Powerglide, 350 and 400 265mm applications allows builders to assemble a high performance converter with minimal effort. With the readily available GM 265mm converter cores, a variety of stall speeds can be built using different stator and impeller combinations.

  • Fully machined cover with bushing installed
  • Unit-specific design for hassle-free installation
  • Oil flow grooves and holes increase fluid flow to keep converters running cooler
  • Turbine hub features a larger flanged diameter to increase the strength rigidity of the turbine
  • Clear, detailed instructions

Pilot kit not included.

This 265mm kit will not fit GM AT-540 units. View Sonnax 245mm converter upgrades available for this unit.

  • Thrust Bearing
  • Flanged Impeller Hub
  • 30-Tooth Turbine Hub
  • Front Cover, 10-3/4" Single Bolt Pattern
  • Front Cover Bushing Installed
  • Unit Size: 265mm
  • Core: GM 265mm
  • Dampered: No
  • Lockup: No
  • Transmission Unit: 350, 400, Powerglide
  • Turbine Hub Input Spline Count: 30

Where to Buy

  • Existing Customers: Contact your sales representative.
  • New Customers: Fill out the form and a sales representative will contact you.
  • 400 (3L80), AT-540, Buick 350, Chevy 350, Powerglide, Powerglide, 350, 400 (265mm) Performance Converter 265mm Performance Converter Kit GM-RK-305