The best replacement for 3.73 is 4.10.

The best alternatives to 3.73 are rated as following:
★★★★★  4.10
★★★  3.42
★★★  4.11
★★★  4.10 gears
★★★  3.90
★★★  3.55
★★  3.55 gears
★★  3.31
★★  4.10 mustang
★  4.10 gear ratio
★  4.11 gears
★  4.10 silverado
★  3.21
★  2.73
★  4.10 mustang gt
★  4.1
★  3.55 f150
★  3.23
★  3.42 gears
★  3.90 gears
★  4.56
★  3.55 gear ratio
★  3.55 mustang
★  4.56 gears
★  4.30
  4.10 axle ratio
  3.55 rear end
  3.43 gears
  3.27
  3.27 gears
  4.1 gear ratio
  3.55 axle ratio
  3.55 axle
  4 10
  3.42 rear axle
  gears

Your alternative for 3.73 is not listed? Suggest!
Speaking about 3.73, one probably shouldn't forget about 35s.

Other search terms related to 3.73 and their ratings are:
★★★★★ 35s
★★★ th350
★★★ 700r4
★ 33's
ecoboost
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3.73
4.10
3.42