The best replacement for 37s is 35s.

The best alternatives to 37s are rated as following:
★★★★★  35s

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Speaking about 37s, one probably shouldn't forget about 3.73 gears.

Other search terms related to 37s and their ratings are:
★★★★★ 3.73 gears
★★★ 6 inch lift
★★ 4.10 gears
★ 4.56 gears
★ 3.55 gears
★ dana 30
4.10
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37s
35s