The best replacement for sled is sleigh.

The best alternatives to sled are rated as following:
★★★★★  sleigh
★★★  sledge
★★★  toboggan
★★★  prowler
★★  opensuse
★★  crrt
★★  scuf
★  cvvh
★  hat
★  parachute
★  sles
★  weighted vest
  hypto krypto
  hemodialysis
  ripstik
  psychedelic germ
  luge
  leg press
  miter saw
  scuff
  ripstick
  speed sled

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Speaking about sled, one probably shouldn't forget about sled.

Other search terms related to sled and their ratings are:
★★★★★ sled
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Google Trends

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sled
sleigh
sledge