{"product_id":"wavetrac-differential-for-g91-7-speed-pdk-or-manual-with-open-differential","title":"Wavetrac Differential For G91 7 speed PDK or manual with open differential","description":"\u003cp\u003e\u003cstrong\u003eFits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e987, 981, 997.2, 991, 991.2, 718\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eSimply put - Wavetrac is the only gear diff on the market that does not lose all drive when one axle is unloaded. Axles become unloaded in aggressive driving, track cornering, extremely slick surfaces, etc. It happens more than most people realise. We won’t go into torque bias ratios or the concept of how torque biasing diffs work at this point. Let’s get to how the Wavetrac affects performance: For example, you have a conventional gear diff (OEM, Quaife, MF, OBX, Truetrac, Torsen, etc.), you're on a race track for a track day and during cornering your inside wheel bumps over the curbing. This is normal for track driving. The issue is that for the brief moments your inside tire becomes unloaded when bouncing over curbs, your other wheel is not getting drive - is not putting power down. Gear diffs need load on both axles in order to function. The result on a track (or during aggressive driving) is that there are many times when a normal gear diff supplies only intermittent power to the gripping wheel. Now, same track with Wavetrac: the patented cam device in the Wavetrac prevents loss of drive when that inside wheel is unloaded. The device is able to generate a load inside the diff (to replace the lost load as it happens) that can then be biased to the gripping wheel - in the end making more consistent power delivery through a corner. That makes the car more predictable, and faster overall. Other benefits: Patented Carbon Fibre Bias Plate for the pinions. All other gear type LSDs run the pinions on the housing, meaning the friction from 0 miles is different to 100 miles, thus effectiveness is reduced over the life of the diff. With the Wavetrac performance is consistent with the Carbon Fibre bias plates! Patented Wave Profile eliminates the effect of a near to and zero load condition drive ability issues found in all other gear type ATB LSDs. ARP Bolts used throughout for superior faster reliability. 9310 steel gears run in billet or forged steel bodies. Manufactured \u0026amp; Designed in the USA WAVETRAC: Smooth is Fast The beauty of the Wavetrac is that it is ideally suited to high performance road cars that see track use. It is very strong, yet transparent to both driver and traction control electronics during regular driving. On the track or in spirited road use, it provides drive to both wheels without the handling issues that traditional clutch type diffs create (there is no tendency to push\/understeer with a Wavetrac). The Wavetrac outperforms other gear type differentials because unlike them, it won't lose drive when one axle is unloaded (which happens more often than you'd think). Lastly, one of the most underrated benefits of the Wavetrac is its smooth delivery of power near the limit. Its patented design makes for a very predictable, smooth addition of power when you need it most - when things are at their limits: on the edge of traction mid-corner and using throttle to keep it there; or coming into a corner a little hot, but quickly back on it to maintain exit speed... These situations are often subjective to the driver, but the benefit can be felt. The Wavetrac makes you faster because it lets you drive with confidence. Smooth is fast. \u003c\/p\u003e\n\u003ch3 data-start=\"458\" data-end=\"490\"\u003e1. \u003cstrong data-start=\"468\" data-end=\"490\"\u003eWear \u0026amp; Gear Damage\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-start=\"491\" data-end=\"657\"\u003eOver time the \u003cem data-start=\"505\" data-end=\"521\"\u003einternal gears\u003c\/em\u003e and \u003cem data-start=\"526\" data-end=\"545\"\u003espider\/side gears\u003c\/em\u003e can wear, especially if driven hard (track use, high torque) or starved of proper lubrication\/ fluid changes.\u003c\/p\u003e\n\u003cul data-start=\"658\" data-end=\"925\"\u003e\n\u003cli data-start=\"658\" data-end=\"819\"\u003e\n\u003cp data-start=\"660\" data-end=\"819\"\u003eWear often leads to \u003cstrong data-start=\"680\" data-end=\"721\"\u003ewhining, growling, or grinding noises\u003c\/strong\u003e from the rear end, especially under acceleration or load. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"820\" data-end=\"925\"\u003e\n\u003cp data-start=\"822\" data-end=\"925\"\u003eGear tooth wear\/pitting can cause \u003cstrong data-start=\"856\" data-end=\"882\"\u003eclunking or notchiness\u003c\/strong\u003e when changing throttle state or cornering\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1060\" data-end=\"1101\"\u003e2. \u003cstrong data-start=\"1070\" data-end=\"1101\"\u003eFluid Leaks \u0026amp; Seal Failures\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-start=\"1102\" data-end=\"1158\"\u003eThe differential uses seals and gaskets to retain oil:\u003c\/p\u003e\n\u003cul data-start=\"1159\" data-end=\"1466\"\u003e\n\u003cli data-start=\"1159\" data-end=\"1218\"\u003e\n\u003cp data-start=\"1161\" data-end=\"1218\"\u003eSeals can \u003cstrong data-start=\"1171\" data-end=\"1188\"\u003efail and leak\u003c\/strong\u003e, leading to low oil levels.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1219\" data-end=\"1314\"\u003e\n\u003cp data-start=\"1221\" data-end=\"1314\"\u003eLow or contaminated gear oil reduces lubrication, causing overheating and accelerated wear.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1315\" data-end=\"1466\"\u003e\n\u003cp data-start=\"1317\" data-end=\"1466\"\u003eBreathers and inspection hole seals can also leak fluid (often noticed as oil spots under the rear of the car).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1577\" data-end=\"1603\"\u003e3. \u003cstrong data-start=\"1587\" data-end=\"1603\"\u003eBearing Wear\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-start=\"1604\" data-end=\"1691\"\u003eThe bearings that support the differential \u003cem data-start=\"1647\" data-end=\"1668\"\u003ecarrier and pinions\u003c\/em\u003e can wear, producing:\u003c\/p\u003e\n\u003cul data-start=\"1692\" data-end=\"1873\"\u003e\n\u003cli data-start=\"1692\" data-end=\"1736\"\u003e\n\u003cp data-start=\"1694\" data-end=\"1736\"\u003e\u003cstrong data-start=\"1694\" data-end=\"1708\"\u003eVibrations\u003c\/strong\u003e through the car at speed,\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1737\" data-end=\"1873\"\u003e\n\u003cp data-start=\"1739\" data-end=\"1873\"\u003e\u003cstrong data-start=\"1739\" data-end=\"1783\"\u003eNoise that increases with load or speed.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1880\" data-end=\"1928\"\u003e4. \u003cstrong data-start=\"1890\" data-end=\"1928\"\u003eHalf-Shaft \/ Retention Clip Issues\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-start=\"1929\" data-end=\"1977\"\u003eEspecially documented in Porsche 981\/718 cars:\u003c\/p\u003e\n\u003cul data-start=\"1978\" data-end=\"2210\"\u003e\n\u003cli data-start=\"1978\" data-end=\"2210\"\u003e\n\u003cp data-start=\"1980\" data-end=\"2210\"\u003eThe \u003cstrong data-start=\"1984\" data-end=\"2030\"\u003eclip holding the inner half-shaft in place\u003c\/strong\u003e can fail under hammering side loads (e.g., track kerbs, hard cornering), allowing the shaft to slip and upset differential alignment\/splines. \u003cspan class=\"\" data-state=\"delayed-open\" aria-describedby=\"radix-_r_1n_\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"2360\" data-end=\"2420\"\u003e5. \u003cstrong data-start=\"2370\" data-end=\"2420\"\u003eSymptoms Drivers Report with Differential Wear\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp data-start=\"2421\" data-end=\"3034\"\u003eIf the diff or related parts are wearing or failing, you’re likely to notice:\u003cbr data-start=\"2498\" data-end=\"2501\"\u003e Whining or howling rear-end noises at speed or under load \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"2598\" data-end=\"2601\"\u003e Clunking \/ knocking on throttle application or lift-off cornering \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"2706\" data-end=\"2709\"\u003e Vibration through the chassis under acceleration \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"2797\" data-end=\"2800\"\u003e Uneven tyre wear due to inconsistent torque distribution \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"2896\" data-end=\"2899\"\u003e Rear end slip or loss of drive in an open diff setup (normal behaviour but exacerbated by wear)\u003c\/p\u003e\n\u003cp data-start=\"2421\" data-end=\"3034\"\u003e\u003cstrong\u003eGearbox codes-7DT-45 \/ 7DT45\/7DT-70 \/ 7DT70\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"2421\" data-end=\"3034\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"2421\" data-end=\"3034\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"The Gearbox Centre","offers":[{"title":"Default Title","offer_id":55911236239686,"sku":null,"price":100.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/8792\/7110\/files\/Screenshot2026-02-02081409.png?v=1770020084","url":"https:\/\/the-gearbox-centre.myshopify.com\/products\/wavetrac-differential-for-g91-7-speed-pdk-or-manual-with-open-differential","provider":"The Gearbox Centre","version":"1.0","type":"link"}