{"product_id":"stellar-automotive-group-4l40e-5l40e-low-reverse-clutch-molded-piston-fits-bmw","title":"Stellar Automotive Group 4L40E\/5L40E Low\/Reverse Clutch Molded Piston fits BMW","description":"\u003cp dir=\"auto\"\u003e\u003cstrong\u003eStellar Automotive Group 4L40E\/5L40E Low\/Reverse Clutch Molded Piston – Compatible for BMW 2000-2010\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eEliminate delayed or no reverse, slipping in 1st gear, and burnt low\/reverse clutches with this precision molded low\/reverse clutch piston from Stellar Automotive Group.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThis direct-replacement piston is the critical apply component for the low\/reverse clutch pack in all 4L40E and 5L40E transmissions found in BMW models. The factory piston commonly cracks or loses its bond under heat and mileage, causing internal leakage that weakens low\/reverse apply — leading to no reverse, harsh clunks, and rapid clutch failure. This molded piston with permanently bonded rubber seal restores full line pressure, delivers instant, firm reverse engagement and rock-solid 1st gear hold, and protects your low\/reverse clutch pack for reliable BMW performance.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003ePerfect fit for popular BMW models including:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul dir=\"auto\"\u003e\n \t\u003cli\u003eBMW 3 Series (E46\/E90)\u003c\/li\u003e\n \t\u003cli\u003eBMW 5 Series (E39\/E60)\u003c\/li\u003e\n \t\u003cli\u003eBMW X3 (E83), X5 (E53)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eSymptoms of a failing low\/reverse piston:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul dir=\"auto\"\u003e\n \t\u003cli\u003eDelayed or no reverse engagement\u003c\/li\u003e\n \t\u003cli\u003eSlipping or weak 1st gear\u003c\/li\u003e\n \t\u003cli\u003eHarsh clunk when reverse grabs\u003c\/li\u003e\n \t\u003cli\u003eBurnt low\/reverse frictions on teardown\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eDon’t let a $50 piston destroy a $500 clutch pack — install the Stellar Automotive Group molded low\/reverse piston and get reverse \u0026amp; 1st gear back to factory strength.\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 restore confident shifting!\u003c\/p\u003e","brand":"Trans Parts Direct","offers":[{"title":"Default Title","offer_id":52425244475573,"sku":"55768A PAFT","price":38.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1006\/3872\/0181\/files\/55768A-PAFT-scaled_b287c90f-c79a-445f-8c99-ab3c6ce4fdd5.jpg?v=1786618944","url":"https:\/\/transpartsdirect.com\/products\/stellar-automotive-group-4l40e-5l40e-low-reverse-clutch-molded-piston-fits-bmw","provider":"Trans Parts Direct","version":"1.0","type":"link"}