How to Install a Flatbed in a Dodge 3500

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Converting your Dodge Ram 3500 to a flatbed can be cost-effective and not very frustrating to do youself. Installing the flatbed yourself will save hundreds on the labor alone. Once you have picked the bed out and determined if you can use the old mounts, the only thing left to do is remove the old bed and place the new one on and bolt it down. Your Dodge will be ready for work in very little time.

Things You'll Need

  • Tape measure
  • Socket set
  • Impact wrench
  • Ratchet
  • Hoist
  • Inspect the body to ensure all wiring and components are free on the top of the frame rail. Run your wires through the inner portion of the rail. Loose running wires could be crushed or severed once the bed lies on top of them.

  • Measure the flatbed body to make sure it will sit even with the truck. The truck must be measured from the back of the cab to the end of the frame rail. Stopping just shy of the tail lights, ensure the flatbed body is the same length.

  • Place the flatbed body on the frame rails. The body, if it was purchased already fabricated for a Dodge Ram 3500, will sit evenly on the frame rail, falling off equal lengths on both sides of the truck. The bed may be heavy as you will need additional help to place the bed on the truck. Or, use a hoist to lower it in place.

  • Mount the flatbed on each corner of the bed. Place a bolt with washers on both sides of the bolt through the mount and into the frame rail. Holes should be already tapped either from the previous bed or the manufacturer. You will find two to four bolts bolts for each mount. Use the existing mounts if you removed the previous bed. Purchase the mounts from a junkyard or have your local parts house point you in the right direction to obtain proper fitting mounts to stabilize your flatbed body onto the frame rail.

  • Tighten all the bolts with a socket wrench or an impact wrench. You may need to hold the head of the bolt with a wrench as you tighten down the nut. Tighten all four corners of the bed. Add additional mounts if you deem necessary to ensure the bed stays in place.

  • Install the wiring to your lights if they were isolated before you installed the bed. Test the lights once you have installed them.

Tips & Warnings

  • Measure everything out before installing. Make sure the flatbed is being installed on the right size frame.
  • Exercise extreme caution when performing this task. The flatbed body is quite heavy and could cause serious injury if dropped or installed incorrectly. Tighten down all your bolts and ensure the bed is fixed to the frame rail of the truck.

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