Peterbilt Rear Engine Mount | Paccar 12448TBG - Automann M17499 | FleetRun FR-ENGN460


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Part Number

  • FleetRun: FR-ENGN460

Cross Reference Part Number

  • Paccar: 12448TBG
  • Automann: M17499 
  • World American: WA03-5202


  • Bushing Material: Poly/Rubber Hybrid (for severe duty & extended life)
  • Mounting Lock Nut Thread: M16-2
  • Overall Length: 9.23 inches
  • Overall Width: 7.28 inches
  • Mounting Lock Nut Distance - Center To Center: 2.75 inches
  • Overall Height: 3.75 inches (side profile of the mount, to the center of the mounting bolt hole)
  • Mounting Bolt Hole Length - Center To Center: 5.69 inches (from first to last)
  • Mounting Bolt Hole Width - Center To Center: 5.90 inches (from top to bottom)
  • Mounting Bolt Hole Diameter: 0.69 inches
  • Mounting Bolt Hole Quantity (to the frame): 4
  • Mounting Bolt Hole Quantity (to the engine): 2

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.

Introducing the FleetRun FR-ENGN460 engine mount/cushion - the perfect solution for preventing vibrations and shaking in your Peterbilt semi-truck with a Paccar 12448TBG or Automann M17499 engine. This top-quality mount bushing/cushion acts as a buffer between your engine and the frame of your truck, ensuring a smooth ride without any annoying vibrations.

With cross-reference part numbers from other brands like Paccar, Automann, and World American, the FleetRun FR-ENGN460 is built to last and withstand the most extreme conditions. Its specifications, including mounting lock nut thread and distance, overall length, width, height, and bolt hole diameter and distance, ensure a perfect fit for your Peterbilt semi-truck.

If you're experiencing shaking or vibrating during engine brake application, engine load or acceleration, it's time to check your engine mount bushings/cushions. Worn-out bushings/cushions can cause the internal mounting bracket of the mount to wobble inside the housing and rip the rubber insulator, resulting in noticeable shaking or vibrating and even causing the cab to shake. Don't let these symptoms go unchecked - replace your engine mount bushings/cushions with the FleetRun FR-ENGN460 for a smooth, hassle-free ride.

Don't sit in discomfort while you haul freight down the road - get your FleetRun FR-ENGN460 engine mount/cushion today. Plus, enjoy FREE SHIPPING on your order!

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

Vehicle Make & Model

  • Peterbilt 386
  • Peterbilt 388
  • Peterbilt 389
  • Peterbilt 567
  • Peterbilt 579


  • Paccar MX-13
  • Cummins ISX
  • Cummins X15

What can cause my Peterbilt semi truck to shake/vibrate?

  • Although there is an endless list of symptoms that can cause vibrating or shaking:

    If your Peterbilt semi-truck shakes or vibrates during engine brake application, engine load, or acceleration, it could be due to worn-out engine mount bushings/cushions. These mount bushings/cushions act as a buffer between the engine and the frame of the truck, but when they wear out, the internal mounting bracket of the mount, which is stressed the most because of the weight of the engine/transmission, it creates freeplay and wobbles inside the housing, causing the rubber insulator to rip and ruining the cushion. This can result in noticeable shaking or vibrating when the engine brake is on, and even cause the cab to shake (you may notice your dashboard or seat shaking slightly). If you're experiencing these symptoms, it's recommended to have your engine mount bushings/cushions inspected and replaced if necessary to prevent further damage and ensure smooth operation of your truck.