6L80

Use with Powerglide-style, 45-tooth frictions, Sonnax steels & 45-tooth 4-5-6 hub 32934ED

GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to OE design shortcomings. Not enough clutches and insufficient clutch piston-to-plate apply surface area causes clutch plate failure, especially when apply pressures exceed OE specifications. The other problem is flexing and bowing of the backing plate (coning), which is a primary source of clutch failure.

This Sonnax high capacity 4-5-6 clutch apply piston kit features a modified OE clutch apply piston and piston dam that are used in conjunction with a specially-designed toothed apply plate closest to the piston. The Sonnax toothed apply plate increases surface area between the apply piston and first friction plate resulting in more even distribution of apply force to clutch plates and allows a friction plate to run against the apply plate. This configuration eliminates OE waved plate. Since Powerglide-style, 45-tooth frictions are a popular 6L80/90 upgrade due to their wider friction surface, the toothed apply plate and the backing plate have a smaller inner diameter to accommodate that style. For best performance, use with Sonnax steels 32368S or 32368SX, BorgWarner high-energy frictions 32318HE and Sonnax extreme duty 4-5-6 clutch hub and intermediate shaft 32934ED (for 6L80).

• Solid backing plate design outperforms OE and aftermarket plates
• Toothed apply plate eliminates waved plate and allows for additional clutch capacity
• Use with Powerglide-style frictions, Sonnax steels and aftermarket, 45-tooth, 4-5-6 clutch hub

Contents:

• Backing Plate
• Apply Plate
• Piston Dam
• Apply Piston

32583KHP Instruction Sheet

Sonnax High Capacity 4-5-6 Clutch Apply Piston Kit - 104960-20K