{"product_id":"suncoast-104960-20k-high-capacity-4-5-6-clutch-apply-piston-kit","title":"Suncoast High Capacity 4-5-6 Clutch Apply Piston Kit","description":"\u003cp\u003e \u003c\/p\u003e\n\n\u003ch3 class=\"light\"\u003eUse with Powerglide-style, 45-tooth frictions, Sonnax steels \u0026amp; 45-tooth 4-5-6 hub.\u003c\/h3\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\n\u003cp\u003eGM 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.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cp\u003eSonnax high capacity 4-5-6 clutch apply piston kit 104960-20K 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 \u003ca href=\"..\/i-30502890-4-5-6-clutch-steel-078-thick.html\"\u003e104120-01\u003c\/a\u003e or \u003ca href=\"..\/i-30502889-4-5-6-clutch-steel-090-thick.html\"\u003e104120-02\u003c\/a\u003e, BorgWarner high-energy frictions \u003ca href=\"..\/i-30502893-clutch-friction-060-thick.html\"\u003e104120-03\u003c\/a\u003e and Sonnax extreme duty 4-5-6 clutch hub and intermediate shaft \u003ca href=\"..\/i-30501161-6l80e-billet-shaft-and-hub-extreme-duty-4-5-6-clutch-hub-intermediate-shaft.html\"\u003e104680-45\u003c\/a\u003e (for 6L80) or 104690-45 (for 6L90).\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003eSolid backing plate design outperforms OE and aftermarket plates\u003c\/li\u003e\n\n\u003cli\u003eToothed apply plate eliminates waved plate and allows for additional clutch capacity\u003c\/li\u003e\n\n\u003cli\u003eUse with Powerglide-style frictions, Sonnax steels and aftermarket, 45-tooth, 4-5-6 clutch hub\u003c\/li\u003e\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Suncoast Performance","offers":[{"title":"Default Title","offer_id":48219387298033,"sku":"104960-20K","price":410.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/1344\/3057\/files\/High-Capacity-4-5-6-Clutch-Apply-Piston-Kit-Suncoast-Performance-151057532.jpg?v=1779828858","url":"https:\/\/tamelessperformance.com\/products\/suncoast-104960-20k-high-capacity-4-5-6-clutch-apply-piston-kit","provider":"TAMELESS PERFORMANCE","version":"1.0","type":"link"}