GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to flexing and bowing of the backing plate (coning), especially when clutch apply pressures exceed OE specification. The heavy-duty Sonnax 4-5-6 clutch backing plate 104140A-01 is designed to minimize flexing/bowing when the clutch is applied, drastically reducing the likelihood of clutch plate distortion.

Stiffer backing plate design outperforms OE and aftermarket plates

More From This Category

Sonnax High Clutch Hub Shim, GM, Powerglide

Sonnax High Clutch Hub Shim, GM, Powerglide

$12.71

Sonnax Reverse Clutch Piston Seal Kit, GM, Powerglide, Each

Sonnax Reverse Clutch Piston Seal Kit, GM, Powerglide, Each

$9.74