![6L80 6L90 4-5-6 Clutch Backing Plate Sonnax 104140A-01](http://phxtransmissionparts.com/cdn/shop/products/32_b63b849a-b0eb-44cf-80c3-ef24ded1ef12_{width}x.jpg?v=1706895423)
6L80 6L90 4-5-6 Clutch Backing Plate Sonnax 104140A-01
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