Powertrain Industry News

Sonnax GM 8L90 Performance Converter Kits

GM 8L90 captive clutch assemblies are difficult to rebuild and are prone to shudder. Sonnax performance converter kits upgrade M5U 8L90 units with a stronger and easy-to-build multi-plate assembly. Featuring a fully machined, forged cover and piston, three high-thermal slipping friction elements and two clutch plates with low-wear splines, boost lock-up capacity without changing shift feel or controlled slip.

  • #GM-RK-25 for M5U 8L90 units behind 4.3L and 5.3L engines
  • #GM-RK-27 for M5U 8L90 units behind 6.2L engines
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