{"product_id":"wavetrac-lsd-for-bmw-168-small-case-axle-2002-e21-e30-open-diff-axles","title":"Wavetrac LSD for BMW 168 Small-Case Axle: 2002, E21 \u0026 E30 (Open-Diff Axles)","description":"\u003cp\u003eA limited slip differential for BMW's small 168mm rear axle as fitted with an open diff to the 2002, the E21 3 Series and the E30. These light rear-drive classics are a joy until the inside wheel lifts on a tight exit; the Wavetrac keeps driving the other one. Some flange and axle work is part of the fitting - see the notes below.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFor BMW's 168mm small-case axle from an open diff\u003c\/li\u003e\n\u003cli\u003eBMW 2002, E21 and E30\u003c\/li\u003e\n\u003cli\u003eKeeps driving the rear wheel with grip when the other lifts\u003c\/li\u003e\n\u003cli\u003eNo clutch packs to wear, so no break-in\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCheck before you order\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFrom an open diff, the drive flanges need modifying, or use the original-equipment LSD flanges. From an original LSD, its flanges can be reused, but an open-diff case or side covers are needed.\u003c\/li\u003e\n\u003cli\u003eThe cars listed are a guide only: BMW fitted more than one axle size and final drive ratio to the same model. Confirm your axle size and ratio from the VIN or the axle's part number before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable class=\"spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePart number\u003c\/th\u003e\n\u003ctd\u003e30.309.120WK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eAutomatic torque-biasing limited slip differential (helical gear)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGears\u003c\/th\u003e\n\u003ctd\u003e9310 alloy steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiff body\u003c\/th\u003e\n\u003ctd\u003eMachined from case-hardened steel billet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFasteners\u003c\/th\u003e\n\u003ctd\u003eARP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBias plates\u003c\/th\u003e\n\u003ctd\u003eCarbon fibre as standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMade in\u003c\/th\u003e\n\u003ctd\u003eUSA, by Autotech Driveline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAxle\u003c\/th\u003e\n\u003ctd\u003eBMW 168mm small case, from an open (non-LSD) differential\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ctable class=\"fitment-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eVersion\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e3-Series\u003c\/td\u003e\n\u003ctd\u003eE21\u003c\/td\u003e\n\u003ctd\u003e1975-1983\u003c\/td\u003e\n\u003ctd\u003eRear axle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e3-Series\u003c\/td\u003e\n\u003ctd\u003eE30\u003c\/td\u003e\n\u003ctd\u003e1982-1994\u003c\/td\u003e\n\u003ctd\u003eRear axle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFitting notes\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eThe original axles need a groove cut in them to take a snap ring.\u003c\/li\u003e\u003c\/ul\u003e","brand":"Wavetrac","offers":[{"title":"Default Title","offer_id":57513714155900,"sku":"30.309.120WK","price":1308.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/9208\/4867\/files\/wavetrac-30-309-120wk-wavetrac-lsd-for-bmw-168-small-case-axle-2002-e21-e30-open-d-1.jpg?v=1790680734","url":"https:\/\/fdracing.co.uk\/products\/wavetrac-lsd-for-bmw-168-small-case-axle-2002-e21-e30-open-diff-axles","provider":"FD Racing","version":"1.0","type":"link"}