{"product_id":"stellar-automotive-group-4l40e-5l40e-coast-clutch-molded-piston-fits-gm","title":"Stellar Automotive Group 4L40E\/5L40E Coast Clutch Molded Piston fits GM","description":"\u003cp dir=\"auto\"\u003e\u003cstrong\u003eStellar Automotive Group 4L40E\/5L40E Coast Clutch Molded Piston – Compatible for GM \u0026amp; BMW 2000-2010\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eStop engine runaway on deceleration and burnt coast clutches with this upgraded molded coast clutch piston from Stellar Automotive Group.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThis direct-replacement piston is the critical apply component for the coast clutch pack in all 4L40E and 5L40E transmissions. The factory coast piston commonly cracks or loses its bond under heat and mileage, causing internal leakage that weakens coast apply — leading to no engine braking, high RPM overrun when letting off the gas, and rapid clutch failure. This molded piston with permanently bonded rubber seal restores full coast-down function, delivers smooth engine braking, and protects your coast clutch pack for reliable daily driving or light towing.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003ePerfect fit for popular models including:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul dir=\"auto\"\u003e\n \t\u003cli\u003eChevrolet Trailblazer, SSR\u003c\/li\u003e\n \t\u003cli\u003eBMW 3 Series (E46), 5 Series (E39)\u003c\/li\u003e\n \t\u003cli\u003eCadillac CTS (early), Escalade (select)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eSymptoms of a failing coast clutch piston:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul dir=\"auto\"\u003e\n \t\u003cli\u003eEngine revs freely when coasting in gear\u003c\/li\u003e\n \t\u003cli\u003eNo engine braking (especially noticeable in lower gears)\u003c\/li\u003e\n \t\u003cli\u003eRatcheting noise or slipping on overrun\u003c\/li\u003e\n \t\u003cli\u003eBurnt coast frictions on teardown\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eDon’t let a $50 piston destroy your coast pack — install the Stellar Automotive Group molded coast piston and feel the engine braking return instantly.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e All parts are distributed, not designed or manufactured, by Stellar Automotive Group.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eAdd this essential 4L40E\/5L40E rebuild part to your cart today and enjoy controlled downshifts every time!\u003c\/p\u003e","brand":"Trans Parts Direct","offers":[{"title":"Default Title","offer_id":52425244246197,"sku":"55762 PAFT","price":31.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1006\/3872\/0181\/files\/55762-PAFT-scaled.jpg?v=1786618910","url":"https:\/\/transpartsdirect.com\/products\/stellar-automotive-group-4l40e-5l40e-coast-clutch-molded-piston-fits-gm","provider":"Trans Parts Direct","version":"1.0","type":"link"}