The best replacement for diff is limited slip.

The best alternatives to diff are rated as following:
★★★★★  limited slip
★★★★★  gear diff
★★★★  ball diff
★★★★  cmp
★★★  sdiff
★★★  slipper clutch
★★★  c diff
★★  patch
★★  auto diff
★★  colitis
★★  gradient matlab
★  food poisoning
★  spool
★  locking diff
★  cmp unix
★  comm
★  ibs
★  diarrhea
★  posi diff
★  cbc without diff
★  lsd
★  gastroenteritis
★  ulcerative colitis
  one way
  gearvdiff
  posi
  md5sum
  giardia
  manual diff

Your alternative for diff is not listed? Suggest!
Speaking about diff, one probably shouldn't forget about plt.

Other search terms related to diff and their ratings are:
★★★★★ plt
★★ pit blood test
platelet
You have in mind a companion for diff and it is not yet here? Propose!



Google Trends

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diff
limited slip
gear diff