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

RTS Clutch & Billet Flywheel Assembly, Heavy Duty Clutch Kit, For Ford V8,Multi Bolt Pattern, 10-Spline, 1 1/16 in. Diameter Shaft, 11 in. Diameter Di

RTS Clutch & Billet Flywheel Assembly, Heavy Duty Clutch Kit, For Ford V8,Multi Bolt Pattern, 10-Spline, 1 1/16 in. Diameter Shaft, 11 in. Diameter Di

$969.57

Sonnax Heavy Duty Forward Clutch Hub, GM, 400, 425, 4L80-E, 4L85-E, Each

Sonnax Heavy Duty Forward Clutch Hub, GM, 400, 425, 4L80-E, 4L85-E, Each

$208.51

RTS Clutch & Billet Black Flywheel Assembly, Xtreme Clutch Kit, For Ford V8, Bronco Bolt Pattern 10-Spline, 1 1/16 in. Diameter Shaft, 11 in. Diameter

RTS Clutch & Billet Black Flywheel Assembly, Xtreme Clutch Kit, For Ford V8, Bronco Bolt Pattern 10-Spline, 1 1/16 in. Diameter Shaft, 11 in. Diameter

$969.57