{"product_id":"velvet-drive-neutral-safety-switch-update-kit-1004-420-052","title":"Velvet Drive Neutral Safety Switch Update Kit 1004-420-052 | Borg Warner 71C \/ 72C","description":"\u003ch2\u003eVelvet Drive Neutral Safety Switch Update Kit — 1004-420-052\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 1004-420-052  |  \u003cstrong\u003eBrand:\u003c\/strong\u003e Borg Warner \/ Velvet Drive\u003c\/p\u003e\n\u003cp\u003eThe Velvet Drive \u003cstrong\u003e1004-420-052\u003c\/strong\u003e is an updated-design neutral safety switch kit for Borg Warner Velvet Drive marine transmissions. It replaces the \u003cstrong\u003eolder large-thread neutral safety switch\u003c\/strong\u003e used on earlier Velvet Drive units with the current \u003cstrong\u003e7\/8 in. wrench-style switch\u003c\/strong\u003e and includes the updated control-valve cover required to accept the new switch design.\u003c\/p\u003e\n\u003cp\u003eThis is a \u003cstrong\u003ecomplete update kit\u003c\/strong\u003e — it is the correct solution when an older Velvet Drive transmission has the large-thread switch that is no longer available as a direct replacement, or when upgrading to the current switch configuration during a rebuild or service.\u003c\/p\u003e\n\u003cp\u003eIf your transmission already uses the current-style 7\/8 in. switch, see the \u003ca href=\"\/products\/8126842568740\"\u003eVelvet Drive Neutral Safety Switch 1000-640-004\u003c\/a\u003e for a direct switch-only replacement instead.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 1004-420-052\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Borg Warner \/ Velvet Drive\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Neutral Safety Switch Update Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Updated neutral safety switch (7\/8 in. wrench style) and updated control-valve cover assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Prevents starter engagement unless the transmission is in the neutral position\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Transmission starting safety circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e approx. 300 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cp\u003eThis update kit is designed for earlier Borg Warner Velvet Drive transmissions originally equipped with the large-thread neutral safety switch. Applicable transmission families include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBorg Warner Velvet Drive \u003cstrong\u003e71C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eBorg Warner Velvet Drive \u003cstrong\u003e72C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eBorg Warner Velvet Drive \u003cstrong\u003e73C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEarlier Velvet Drive units where the existing switch requires a wrench \u003cstrong\u003elarger than 7\/8 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eConfirm the existing switch wrench size before ordering. If the installed switch already accepts a \u003cstrong\u003e7\/8 in. wrench\u003c\/strong\u003e, order the switch-only replacement \u003ca href=\"\/products\/8126842568740\"\u003e1000-640-004\u003c\/a\u003e instead of this kit.\u003c\/p\u003e\n\n\u003ch2\u003eSupersession Note\u003c\/h2\u003e\n\u003cp\u003eThe 1004-420-052 kit was introduced because the original large-thread neutral safety switch used on early Velvet Drive transmissions became unavailable as a standalone replacement. This kit converts the transmission to the current small-thread \/ 7\/8 in. switch standard by replacing both the switch and the control-valve cover that threads it.\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Use This Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThe existing neutral safety switch requires a wrench \u003cstrong\u003elarger than 7\/8 in.\u003c\/strong\u003e and is no longer available as a direct replacement\u003c\/li\u003e\n\u003cli\u003eThe starter will not engage even when the transmission is confirmed in neutral\u003c\/li\u003e\n\u003cli\u003eThe starter operates intermittently as the shift lever is moved through neutral\u003c\/li\u003e\n\u003cli\u003eThe engine can crank or start while the transmission is in forward or reverse gear\u003c\/li\u003e\n\u003cli\u003eSwitch terminals or body are damaged or corroded beyond service\u003c\/li\u003e\n\u003cli\u003eUpgrading from the old large-thread switch style during a transmission rebuild or overhaul\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDisconnect battery power before working on any starting-circuit component\u003c\/li\u003e\n\u003cli\u003eConfirm the transmission is in neutral before disassembly\u003c\/li\u003e\n\u003cli\u003eNote the existing wiring connections and switch orientation before removal\u003c\/li\u003e\n\u003cli\u003eRemove the old switch and control-valve cover per the Velvet Drive service procedure\u003c\/li\u003e\n\u003cli\u003eInstall the updated cover from the kit, ensuring the mating surfaces are clean and free of old gasket material\u003c\/li\u003e\n\u003cli\u003eThread in the new switch using a \u003cstrong\u003e7\/8 in. wrench\u003c\/strong\u003e — do not overtighten\u003c\/li\u003e\n\u003cli\u003eReconnect the electrical leads, restore battery power\u003c\/li\u003e\n\u003cli\u003eTest starting operation in \u003cstrong\u003eneutral, forward, and reverse\u003c\/strong\u003e: starter should engage only in neutral\u003c\/li\u003e\n\u003cli\u003eInspect for oil seepage around the new switch body and cover after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCross-Reference Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBorg Warner \/ Velvet Drive:\u003c\/strong\u003e 1004-420-052\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch included:\u003c\/strong\u003e 1000-640-004 style (7\/8 in. wrench)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/8126842568740\"\u003eVelvet Drive Neutral Safety Switch 1000-640-004\u003c\/a\u003e — switch-only replacement for transmissions already using the 7\/8 in. switch style\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/8131362521124\"\u003eVelvet Drive 71C \/ 72C Gasket \u0026amp; Oil Seal Kit A4867HA\u003c\/a\u003e — comprehensive seal kit for 71C \/ 72C overhaul\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/8131361832996\"\u003eBorg Warner Shift Spool O-Ring — Velvet Drive 71C \/ 72C | 4804H\u003c\/a\u003e — shift circuit sealing component\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/8131362390052\"\u003eBorg Warner Velvet Drive Input Shaft — 71C \/ 72VDR Series | 71C-3A16\u003c\/a\u003e — related drivetrain component\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/8131362684964\"\u003eVelvet Drive 13.25” Damper Plate 1004-650-007 | GM 454 \/ Ford Lehman\u003c\/a\u003e — related drivetrain interface component\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e The 1004-420-052 kit is the right call when an older Velvet Drive 71C or 72C has a failed large-thread neutral safety switch and a direct switch replacement is no longer available. Rather than leaving the vessel without a functioning safety switch, this kit converts the control-valve cover to accept the current 7\/8 in. switch style — a permanent, correct-spec fix rather than a workaround. It’s also commonly used as a planned upgrade during a full transmission rebuild.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon issues:\u003c\/strong\u003e The most frequent mistake is ordering this kit when the existing transmission already has the updated 7\/8 in. switch style — in that case the switch-only \u003ca href=\"\/products\/8126842568740\"\u003e1000-640-004\u003c\/a\u003e is all that’s needed and this kit is unnecessary. Check the existing switch with a wrench first: if it fits a 7\/8 in., order the switch alone. If it requires a larger wrench, order this kit. The second common issue is assuming the switch is faulty when the real problem is a misadjusted shift cable that isn’t moving the transmission lever fully into the neutral detent — confirm the shift mechanism is properly adjusted before replacing the switch.\u003c\/p\u003e","brand":"BOR","offers":[{"title":"Default Title","offer_id":43553406713892,"sku":"1004-420-052","price":274.62,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/OEMBorgWarnerNeutralSafetySwitchKit.png?v=1770838299","url":"https:\/\/marisolmarine.com\/products\/velvet-drive-neutral-safety-switch-update-kit-1004-420-052","provider":"Marisol Marine Company","version":"1.0","type":"link"}