The best replacement for transmission is utorrent.

The best alternatives to transmission are rated as following:
★★★★★  utorrent
★★★★★  deluge
★★★★★  distribution
★★★★  automatic transmission
★★★  engine
★★★  clutch
★★★  manual
★★★  transaxle
★★★  automatic
★★★  torque converter
★★★  vuze
★★★  absorbance
★★  manual transmission
★★  azureus
★★  rtorrent
★  absorption
★  spark plugs
★  clutch problem
★  new car
★  bittorrent
★  transduction
★  fuel pump
★  transfer case
★  qbittorrent
★  analog transmission
★  alternator
★  transmittance
★  vze
★  cvt
  catalytic converter
  ktorrent
  rebuilt transmission
  w56
  allison transmission
  emission
  differential
  automatic cars
  reflection
  misfire
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  auto
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  acquisition
  scanning electron microscopy
  four speed automatic
  digital transmission
  vuse
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  transmission
  xtorrent
  used
  hydrostatic
  motor
  five speed

Your alternative for transmission is not listed? Suggest!
Speaking about transmission, one probably shouldn't forget about torque converter.

Other search terms related to transmission and their ratings are:
★★★★★ torque converter
★★★★★ proxy
★★★★ pto
★★★ magnet links
★★ modulation
★★ reverse
★★ rss
★ flexget
★ sickbeard
automatic
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Google Trends

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transmission
utorrent
deluge