The best replacement for zf6 is 4r100.

The best alternatives to zf6 are rated as following:
★★★★★  4r100
★★★  t56
★★★  nv5600
★★★  g56
★★  nv4500
★★  zf5
★  5r110
★  allison

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zf6
4r100
t56