{"product_id":"wavetrac-helical-lsd-porsche-915-18-911-and-930-1974-1977","title":"Wavetrac Helical LSD – Porsche 915-18  911 and 930 (1974–1977)","description":"\u003ch3 data-start=\"147\" data-end=\"190\"\u003eWavetrac Helical LSD – Porsche 915-18\u003c\/h3\u003e\n\u003cp data-start=\"191\" data-end=\"216\"\u003e\u003cstrong data-start=\"191\" data-end=\"216\"\u003e911 \u0026amp; 930 (1974–1977)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"218\" data-end=\"438\"\u003eThe Wavetrac limited-slip differential is a modern, torque-biasing upgrade for Porsche 915-18 transmissions, delivering predictable traction and improved stability without the compromises of traditional clutch-type LSDs.\u003c\/p\u003e\n\u003cp data-start=\"440\" data-end=\"812\"\u003eUsing a precision \u003cstrong data-start=\"458\" data-end=\"474\"\u003ehelical gear\u003c\/strong\u003e design, Wavetrac provides smooth, progressive torque transfer under acceleration and deceleration. Unlike conventional gear-type LSDs, Wavetrac incorporates a patented \u003cstrong data-start=\"643\" data-end=\"673\"\u003ewave-cam preload mechanism\u003c\/strong\u003e, allowing the differential to continue biasing torque even when one wheel becomes unloaded—such as over crests, kerbs, or uneven surfaces.\u003c\/p\u003e\n\u003cp data-start=\"814\" data-end=\"967\"\u003eThis makes it particularly well suited to early 911 and 930 chassis where weight transfer and suspension geometry can momentarily reduce rear wheel load.\u003c\/p\u003e\n\u003ch4 data-start=\"969\" data-end=\"986\"\u003eKey features\u003c\/h4\u003e\n\u003cul data-start=\"987\" data-end=\"1253\"\u003e\n\u003cli data-start=\"987\" data-end=\"1022\"\u003e\n\u003cp data-start=\"989\" data-end=\"1022\"\u003eHelical gear torque-biasing LSD\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1023\" data-end=\"1076\"\u003e\n\u003cp data-start=\"1025\" data-end=\"1076\"\u003ePatented no-load \/ near-zero load traction device\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1077\" data-end=\"1127\"\u003e\n\u003cp data-start=\"1079\" data-end=\"1127\"\u003eSmooth, quiet operation with no clutch chatter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1128\" data-end=\"1187\"\u003e\n\u003cp data-start=\"1130\" data-end=\"1187\"\u003eMaintenance-free design (no friction plates to service)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1188\" data-end=\"1253\"\u003e\n\u003cp data-start=\"1190\" data-end=\"1253\"\u003eHigh-strength alloy steel construction for road and track use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"1255\" data-end=\"1268\"\u003eBenefits\u003c\/h4\u003e\n\u003cul data-start=\"1269\" data-end=\"1457\"\u003e\n\u003cli data-start=\"1269\" data-end=\"1307\"\u003e\n\u003cp data-start=\"1271\" data-end=\"1307\"\u003eImproved rear traction under power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1308\" data-end=\"1343\"\u003e\n\u003cp data-start=\"1310\" data-end=\"1343\"\u003eIncreased corner exit stability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1344\" data-end=\"1402\"\u003e\n\u003cp data-start=\"1346\" data-end=\"1402\"\u003eBetter control during lift-off and braking transitions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1403\" data-end=\"1457\"\u003e\n\u003cp data-start=\"1405\" data-end=\"1457\"\u003eNo change to drivability or NVH in normal road use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"1459\" data-end=\"1471\"\u003eFitment\u003c\/h4\u003e\n\u003cul data-start=\"1472\" data-end=\"1573\"\u003e\n\u003cli data-start=\"1472\" data-end=\"1519\"\u003e\n\u003cp data-start=\"1474\" data-end=\"1519\"\u003e\u003cstrong data-start=\"1474\" data-end=\"1489\"\u003ePorsche 911\u003c\/strong\u003e: 1974–1977 (915-18 gearbox)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1520\" data-end=\"1573\"\u003e\n\u003cp data-start=\"1522\" data-end=\"1573\"\u003e\u003cstrong data-start=\"1522\" data-end=\"1537\"\u003ePorsche 930\u003c\/strong\u003e: 1974–1977 (915-based transmission)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"1575\" data-end=\"1585\"\u003eNotes\u003c\/h4\u003e\n\u003cul data-start=\"1586\" data-end=\"1799\"\u003e\n\u003cli data-start=\"1586\" data-end=\"1662\"\u003e\n\u003cp data-start=\"1588\" data-end=\"1662\"\u003eDirect replacement for factory open or LSD units in 915-18 transmissions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1663\" data-end=\"1730\"\u003e\n\u003cp data-start=\"1665\" data-end=\"1730\"\u003eCompatible with standard gear oils recommended for helical LSDs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1731\" data-end=\"1799\"\u003e\n\u003cp data-start=\"1733\" data-end=\"1799\"\u003eProfessional installation and correct setup strongly recommended\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1801\" data-end=\"2022\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eA proven solution for fast road, historic motorsport, and track-focused builds where reliability, consistency, and modern traction control are required—without sacrificing the character of the early air-cooled drivetrain.\u003c\/p\u003e","brand":"Rennworks Performance","offers":[{"title":"Default Title","offer_id":56911556444495,"sku":"40.309.140WK","price":1980.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0942\/0924\/5519\/files\/40.309.160WK_2040.309.160WK-2_20_282_29.jpg?v=1769443740","url":"https:\/\/rennworks-performance.com\/products\/wavetrac-helical-lsd-porsche-915-18-911-and-930-1974-1977","provider":"Rennworks Performance","version":"1.0","type":"link"}