Featuring a stiffer backing plate design proven to outperform OE plates, Sonnax 4-5-6 clutch backing plate 104140A-01 effectively minimizes flexing/bowing when the clutch is applied, drastically reducing the possibility of clutch plate distortion in GM 6L80/90 transmissions.
Complete kit also available:
4-5-6 Clutch Apply Piston Kit 104960-01K