{"product_id":"mpx-4-12-final-drive-ring-gear-output-shaft-kit-t350-transmission","title":"MPx 4.12 Final Drive Ring Gear \u0026 Output Shaft – T350 Transmission\/Neon\/Eclipse\/PT Cruiser","description":"\u003cp\u003e\u003cspan\u003eLooking for quicker acceleration from your Dodge Neon, Mitsubishi Eclipse, or Chrysler PT Cruiser? Our \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMPx 4.12 Final Drive Ring Gear and Output Shaft Kit\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is designed to deliver a noticeable improvement in acceleration by replacing the factory 3.55 or 3.94 final drive gearing with a more aggressive 4.12 ratio.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe shorter 4.12 final drive increases torque multiplication at the wheels, helping your engine pull harder through every gear. Whether you're building a spirited street car or looking to improve acceleration at the track, this upgrade makes better use of your engine's available power without requiring additional horsepower.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eBuilt for Strength and Durability\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis isn't just a gearing upgrade. Our 4.12 final drive kit is manufactured using premium \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eJapanese SAE 8620 alloy steel\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, selected for its strength, toughness, and suitability for high-load transmission components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach component is forged and double-tempered for exceptional toughness, while advanced shot-peening technology helps improve surface durability and resistance to fatigue.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eKey Features:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAggressive 4.12 final drive ratio for improved acceleration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDirect replacement for factory 3.55 and 3.94 final drive gearing in compatible T350 transmissions\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufactured from premium Japanese SAE 8620 alloy steel\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eForged construction for superior strength and toughness\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDouble-tempered for enhanced durability\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAdvanced shot-peening treatment for improved surface fatigue resistance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIncludes matching 4.12 ring gear and output shaft\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003ch3\u003e\u003cspan\u003eVehicle Applications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eFits T350 manual transmissions found in:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e1995–2005 Dodge\/Plymouth Neon\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, 2.0 Liter equipped with the T350 transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e1995–1999 Mitsubishi Eclipse\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, non-turbo models equipped with the T350 transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e2001–2010 Chrysler PT Cruiser\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, non-turbo models equipped with the T350 manual transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003ch3\u003e\u003cspan\u003eHow Much Difference Does 4.12 Gearing Make?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eCompared with the factory final drive ratios:\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan\u003eFactory Ratio\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eNew Ratio\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eIncrease in Torque Multiplication\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e3.55\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4.12\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003e16.1%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e3.94\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4.12\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003e4.6%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe result is stronger acceleration and improved responsiveness, particularly when upgrading from the taller 3.55 gearing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePlease Note:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A shorter final drive ratio also increases engine RPM at a given road speed. In our test car which originally came with a 3.55 gas saving transmission with .72 fifth gear ratio and with this 4.12 final drive, we were turning 3000 rpms at 70mph. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis output shaft and ring gear requires transmission disassembly and professional installation is recommended.\u003c\/span\u003e\u003c\/p\u003e","brand":"Modern Performance","offers":[{"title":"Default Title","offer_id":44838506070094,"sku":"221214","price":799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/2902\/0238\/files\/mpx412outputshaft5.jpg?v=1793997278","url":"https:\/\/www.modernperformance.com\/ja\/products\/mpx-4-12-final-drive-ring-gear-output-shaft-kit-t350-transmission","provider":"Modern Performance","version":"1.0","type":"link"}