{"product_id":"zronickly-speedometer-drive-gear-for-ford-mustang-t5-t45-23-tooth-white-recalibration-gear-for-3-73-4-10-ratios","title":"Zronickly Speedometer Drive Gear for Ford Mustang T5\/T45 — 23-Tooth White Recalibration Gear for 3.73\/4.10 Ratios","description":"\u003cstrong\u003eZronickly’s white 23-tooth speedometer drive gear recalibrates your Mustang’s speedometer after changing rear axle ratios on T5 or T45 manual transmissions.\u003c\/strong\u003e\n\nWhether you swapped to a 3.73 or 4.10 ring-and-pinion or simply need the correct driven gear after a differential change, this lightweight plastic 23-tooth drive gear with clip is made to restore accurate speedometer readings on many Fox-body and SN95 Mustangs. It is a commonly used aftermarket replacement engineered for manual T5 and T45 transmissions covering popular 1983–1998 V8 Mustang applications.\n\n\u003ch3\u003eWhich Mustang years and gear ratios does this speedometer drive gear fit?\u003c\/h3\u003e\n\u003cp\u003eThis driven gear is designed for V8 Mustangs with T5 or T45 manual transmissions from 1983 through 1998. It specifically addresses setups using higher numerical rear ratios where recalibration is needed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1983–1989 Mustangs with 4.10 rear gear and T5\/T45 transmission.\u003c\/li\u003e\n  \u003cli\u003e1990–1998 V8 Mustangs with T5\/T45 and 3.55, 3.73, or 4.10 rear ratios.\u003c\/li\u003e\n  \u003cli\u003eIntended for manual transmissions (not AOD\/AODE automatics).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this 23-tooth gear restore speedometer accuracy?\u003c\/h3\u003e\n\u003cp\u003eThe speedometer driven gear changes the speed sensor’s rotational relationship to the transmission output. When you alter the differential ratio, replacing the driven gear compensates for the new wheel-to-driveshaft relationship so the speedometer displays proper speed and mileage.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMatches tooth count to the changed rear-end ratio for corrected speed readings.\u003c\/li\u003e\n  \u003cli\u003eReplaces worn or incorrect driven gears after differential swaps.\u003c\/li\u003e\n  \u003cli\u003eIncludes a retaining clip to secure the vehicle speed sensor wiring harness.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat material and features should I expect from this aftermarket gear?\u003c\/h3\u003e\n\u003cp\u003eThis Zronickly driven gear is molded from durable plastic in a white finish and includes a clip for the sensor harness. The plastic construction is standard for OE-style speedo gears, offering quiet operation and correct engagement with the transmission’s driven components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWhite plastic body, 23 teeth, engineered for manual T5\/T45 applications.\u003c\/li\u003e\n  \u003cli\u003eSupplied with a clip to hold wiring and prevent sensor movement or chafing.\u003c\/li\u003e\n  \u003cli\u003eLightweight, easy to handle and replace during routine service or upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow simple is it to install this speedometer drive gear myself?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for someone comfortable working under the vehicle and accessing the transmission output. It’s a fast, inexpensive way to recalibrate your speedometer after a rear-end swap.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDrain or support transmission per shop manual, access the speedometer gear housing.\u003c\/li\u003e\n  \u003cli\u003eRemove the old driven gear, install the new 23-tooth Zronickly gear and clip, then reassemble.\u003c\/li\u003e\n  \u003cli\u003eNo special tools required beyond basic hand tools and reference to the service manual.\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for\n\nThis part is aimed at Mustang owners, restorers and performance builders who have changed rear-axle ratios or need a replacement driven gear for manual T5\/T45 transmissions. If you own a 1983–1989 Mustang with a 4.10 or a 1990–1998 V8 Mustang running 3.55, 3.73 or 4.10 gears and want reliable, accurate speedometer readings, this 23-tooth white speedometer drive gear with clip is a practical, OEM-style solution that’s quick to fit and budget-friendly.\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this 23-tooth gear work in automatic transmissions?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. This Zronickly 23-tooth driven gear is intended for manual T5 and T45 transmissions only.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need special tools to install this speedometer gear?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No special tools are required beyond basic hand tools; follow the service manual for safe access and installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Zronickly","offers":[{"title":"Default Title","offer_id":67593221800121,"sku":"B0GDY3DTGW","price":58.94,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/zronickly-speedometer-drive-gear-front-view.jpg?v=1790573241","url":"https:\/\/redleafauto.ca\/products\/zronickly-speedometer-drive-gear-for-ford-mustang-t5-t45-23-tooth-white-recalibration-gear-for-3-73-4-10-ratios","provider":"Redleaf Auto","version":"1.0","type":"link"}