Steer King Pin Kit | Volvo / Mack | Stemco K536M - Volvo 85108338 | FleetRun FR-STRG721


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Part Number

  • FleetRun: FR-STRG721

Cross Reference Part Number

  • Stemco / Kaiser: K536M (spiral/threaded - no ream necessary)
  • Volvo: 85108338 (nylon/composite bushings)
  • Meritor: R201338 (nylon/composite bushings) / R202035 (spiral/threaded - no ream necessary)
  • Mack: 301SQ53 (nylon/composite bushings)
  • Automann: 460.542N
  • PAI: AKP-9847 (nylon/composite bushings)

Kit Breakdown:

  • 2x - King Pin: Volvo 20390834 / 20590487
  • 2x - Nut Retainer: Volvo 1075914
  • 2x - Upper Cover: Volvo 20399428
  • 2x - Lower Cover: Volvo 1078564
  • 2x - Upper Sealing Ring: Volvo 1078240
  • 2x - Bushing: Volvo 3173775 / 21416557 (nylon/composite)
  • 2x - Lower Sealing Ring: Volvo 3173774
  • 2x - Bearing: Volvo 3173772
  • 1x - Shim Kit


  • Thread: M40x1.5
  • Spindle Bore Diameter: 2.55-2.56 inches
  • Pin Type: Tapered
  • Bushing Type: Spiral / Quick Thread
  • Kit Completes The Job For Both Sides
  • Fits Volvo/Mack FXL Axles
  • Replaces the Stemco Kaiser Qwik Kit style

Please note: this is an aftermarket part, the use of other manufacturer's names, part numbers or trademarks is for informational purposes only.

Please verify OEM part numbers before purchasing, FleetRun assumes no liability related to product use and fitment.

 Are your semi truck's worn-out king pins causing uneven tire wear, a shaking front end, and dangerous driving conditions? Don't compromise on safety. Upgrade to the Steer King Pin Qwik Kit by FleetRun, designed specifically for Volvo and Mack trucks with FXL axles.

With cross-reference part numbers including Stemco / Kaiser K536M, Volvo 85108338, Meritor R201338/R202035, Mack 301SQ53, and more, our kit includes everything you need for a complete replacement job on both sides. The kit breakdown includes 2x king pins, nut retainers, upper and lower covers, sealing rings, bushings, bearings, and a shim kit.

Say goodbye to uneven tire wear, front-end shaking, and unsafe driving conditions with our Steer King Pin Qwik Kit. Trust in FleetRun for reliable and high-quality replacement parts for your Volvo or Mack truck. Upgrade your steering performance and ensure a smooth and safe ride on the road. Installation instructions and FAQs are available for your convenience. Visit our Shop Talk page for additional tips and troubleshooting from our experienced technicians and shops. Don't wait, invest in the safety of your truck today!

  • For other information such as tips and tricks or troubleshooting from technicians and shops visit our Shop Talk page from our menu
  • Installation Instructions

What can cause uneven tire wear, even after doing alignment?

One possible cause of uneven tire wear on the steer axle, even if the alignment is correct, could be worn-out king pins. King pins play a crucial role in the steering system of a vehicle, and when they become worn or damaged, they can result in uneven tire wear, shaking front end, and other dangerous driving conditions. Replacing the king pins with high-quality replacement parts, such as the Steer King Pin Qwik Kit by FleetRun, designed specifically for Volvo and Mack trucks, can help resolve this issue and ensure a smooth and safe ride on the road.

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