{"product_id":"borg-warner-velvet-drive-input-shaft-71c-72vdr-71c-3a16","title":"Borg Warner Velvet Drive Input Shaft – 71C \/ 72VDR Series | 71C-3A16","description":"\u003ch2\u003eBorg Warner Velvet Drive Input Shaft – 71C \/ 72VDR Series | Part 71C-3A16\u003c\/h2\u003e\n\n\u003cp\u003eA direct-replacement input shaft for Borg Warner Velvet Drive 71C and 72VDR series marine transmissions. The input shaft is the primary rotating component that transfers engine torque from the flywheel coupling into the transmission — it is the first point of power entry and must be in correct condition for the transmission to shift, engage, and hold load reliably. This part is typically replaced during a full transmission rebuild or when the shaft shows wear, damage, or spline deterioration that cannot be corrected by other means.\u003c\/p\u003e\n\n\u003ch3\u003ePart Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 71C-3A16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Borg Warner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Transmission Input Shaft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmission Family:\u003c\/strong\u003e Velvet Drive – 71C \/ 72VDR Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Marine transmission – input \/ power transfer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagram Position:\u003c\/strong\u003e Input shaft assembly — refer to the Velvet Drive 71C\/72C parts diagram, input shaft section\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New OEM replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBorg Warner Velvet Drive 71C series marine transmissions\u003c\/li\u003e\n\u003cli\u003eBorg Warner Velvet Drive 72VDR series marine transmissions (reverse-gear configuration)\u003c\/li\u003e\n\u003cli\u003eMarine inboard applications where part number 71C-3A16 is specified in the transmission parts diagram\u003c\/li\u003e\n\u003cli\u003eConfirm fitment against your transmission model number, ratio, and parts diagram before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDuring a full Velvet Drive 71C or 72VDR transmission rebuild\u003c\/li\u003e\n\u003cli\u003eWhen the input shaft splines show wear, rounding, or damage\u003c\/li\u003e\n\u003cli\u003eWhen vibration or noise is traced to the input shaft or coupling interface\u003c\/li\u003e\n\u003cli\u003eWhen the shaft shows scoring, cracking, or dimensional wear beyond service limits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInput shaft replacement requires full transmission removal and disassembly — refer to the Velvet Drive 71C\/72C service manual for the correct procedure\u003c\/li\u003e\n\u003cli\u003eInspect the flywheel coupling, input bearing, and all seals before reassembly\u003c\/li\u003e\n\u003cli\u003eReplace all seals and gaskets disturbed during disassembly — do not reuse old seals\u003c\/li\u003e\n\u003cli\u003eVerify correct shaft orientation and torque all fasteners to specification\u003c\/li\u003e\n\u003cli\u003eCheck coupling alignment after reinstallation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the difference between the 71C and 72VDR?\u003c\/strong\u003e The 71C is the standard Velvet Drive unit; the 72VDR is the reverse-gear variant. The input shaft part number 71C-3A16 applies to both — confirm against your transmission’s model plate and parts diagram.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan I replace just the input shaft without a full rebuild?\u003c\/strong\u003e In most cases, no — accessing the input shaft requires full disassembly. If the transmission is already apart, replace all wear items at the same time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat other parts should I replace at the same time?\u003c\/strong\u003e At minimum, replace all seals, the \u003ca href=\"\/products\/borg-warner-shift-spool-o-ring-velvet-drive-71c-72c-4804h\"\u003eshift spool O-ring (4804H)\u003c\/a\u003e, and inspect the \u003ca href=\"\/products\/borg-warner-velvet-drive-oil-pump-71c-72c-71c-a60\"\u003eoil pump (71C-A60)\u003c\/a\u003e for wear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/borg-warner-velvet-drive-oil-pump-71c-72c-71c-a60\"\u003eBorg Warner Velvet Drive Oil Pump – 71C \/ 72C Series (71C-A60)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/borg-warner-shift-spool-o-ring-velvet-drive-71c-72c-4804h\"\u003eBorg Warner Shift Spool O-Ring – Velvet Drive 71C \/ 72C (4804H)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/crusader-damper-plate-302-351-sae-0-borgwarner-oem-part-r140001\"\u003eCrusader Damper Plate 302\/351 – SAE #0 \/ BorgWarner (R140001)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003eThe input shaft is one of the highest-value components in a Velvet Drive rebuild — it’s the right part to replace when spline wear or shaft damage is confirmed on inspection, or when a transmission is being fully rebuilt and the shaft is at or near service limits. The most common mistake is ordering the input shaft without first confirming the exact transmission model and ratio from the model plate on the unit itself; the 71C and 72VDR share this part number, but other Velvet Drive variants use different shafts. Because the transmission must be fully disassembled to access this part, it’s always worth replacing the \u003ca href=\"\/products\/borg-warner-shift-spool-o-ring-velvet-drive-71c-72c-4804h\"\u003eshift spool O-ring (4804H)\u003c\/a\u003e and inspecting the \u003ca href=\"\/products\/borg-warner-velvet-drive-oil-pump-71c-72c-71c-a60\"\u003eoil pump (71C-A60)\u003c\/a\u003e at the same time — the labour to get back in is the same either way.\u003c\/p\u003e","brand":"BOR","offers":[{"title":"Default Title","offer_id":43563779784740,"sku":"71C-3A16","price":1906.56,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/9d71ff75-5c81-4012-a46b-4d09be4230f5.png?v=1787614389","url":"https:\/\/marisolmarine.com\/products\/borg-warner-velvet-drive-input-shaft-71c-72vdr-71c-3a16","provider":"Marisol Marine Company","version":"1.0","type":"link"}