The best replacement for 3.55 is 3.73.

The best alternatives to 3.55 are rated as following:
★★★★★  3.73
★★★★  3.73 gears
★★★★  4.10
★★★  3.73 mustang
★★★  3.92
★★  3.92 gears
★★  3.73 f150
★★  3.31
★★  3.73 gear ratio
★★  4.30
★★  3.21 axle ratio
★  3.92 axle ratio
★  3.31 axle ratio
★  3.73 axle ratio
★  4.21
★  4.30 cfw
★  3.92 rear axle ratio
★  3.73 ecoboost
★  3.31 axle
  3.41
  3.31 gears
  3.08
  4.11
  4.10 gears
  2.73
  3.92 rear axle
  3.73 axle
  3.91

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Speaking about 3.55, one probably shouldn't forget about 35s.

Other search terms related to 3.55 and their ratings are:
★★★★★ 35s
★★★★ psn
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3.55
3.73
3.73 gears