Steel Spools

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      GM 14 bolt spool 30 spline 10.5 axle on a white background
      Yukon GM 14-Bolt Steel Spool - 30-Spline, 10.5" Rear Axle
      $431.30
      Yukon Dana 60 Steel Spool on a white background
      Yukon Dana 60 Spool - 4.10 & Down, 35 Spline
      $341.28
      Dana 60 35 Spline Steel Spool on a white background
      Yukon Dana 60 Spool - 4.56 & Up, 35 Spline
      $362.70
      A rock crawler steel spool for Dana 44 rear axle on a white background
      Yukon Dana 44 Steel Spool - 30-Spline, 3.92 & Up
      $257.45
      Yukon Dana 80 full spool 4.10 up differential on a white background
      Yukon Dana 80 Steel Spool - 35-Spline, 4.10 & Up
      $631.75
      drag racing spool for Dana 80 37-spline axle on a white background
      Yukon Dana 80 Steel Spool - 37-Spline, 4.10 & Up
      $912.95
      GM 8.6 rear axle spool for drag racing setups on a white background
      Yukon GM 8.5" & 8.6" Steel Spool - 30-Spline, 2.73 & Up
      $379.05
      Two GM 14 bolt 30 spline spools on a white background
      Table listing Chevrolet and GMC vehicle models with their respective years of production fitting Yukon 14 bolt thick gear performance spool
      GM 14-Bolt Steel Spool - 10.5" Axle, 4.10 & Down, 40 Spline
      $362.90

      Steel spools provide the simplest and strongest method of achieving 100% torque transfer to both axle shafts by permanently locking both wheels together. With no clutches, springs, gears, or engagement mechanisms, a spool creates a solid connection between the ring gear and axle shafts, eliminating many of the failure points found in traditional differentials and lockers. This lightweight, durable design makes steel spools a popular choice for rock crawlers, rock bouncers, Ultra4 race cars, mud trucks, drag racing vehicles, and other high-horsepower applications where maximum traction and drivetrain strength are the priority. Available for popular axle platforms including Dana 44, Dana 60, Dana 80, GM 14-Bolt, and GM 8.5" differentials, steel spools deliver predictable performance, exceptional durability, and a cost-effective traction solution for dedicated off-road and competition vehicles.

      Which Traction is Right for Your Build?

      Feature Steel Spool Automatic Locker Selectable Air Locker
      Traction 100% locked all the time Locks under power Driver controlled
      Street Manners Poor Moderate Best
      Off-Road Traction Maximum Excellent Excellent
      Turning Ability Most difficult Better than spool Best when unlocked
      Complexity Lowest Medium Highest
      Maintenance Lowest Moderate More components
      Best For Race-only, mud trucks, rock bouncers Trail rigs, crawlers, off-road trucks Dual-purpose rigs, overland, street/trail
      Cost Lowest Medium Highest

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