The best replacement for ax15 is nv3550.

The best alternatives to ax15 are rated as following:
★★★★★  nv3550
★★★★★  ax5
★★★★  nv3500
★★★★  aw4
★★★  ba10
★★  r154
★★  r150
★  nv4500
  t176

Your alternative for ax15 is not listed? Suggest!
Speaking about ax15, one probably shouldn't forget about dana 300.

Other search terms related to ax15 and their ratings are:
★★★★★ dana 300
★ 4bt
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ax15
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