The best replacement for locker is limited slip.

The best alternatives to locker are rated as following:
★★★★★  limited slip
★★★★  posi
★★★★  spool
★★★  truetrac
★  finish line
★  litter genie
★  mallet
★  detroit locker
★  pryor
★  foles
★  arb
★  luck
★  hasselbeck
★  fitzpatrick
★  winch
★  avatar
★  gabbert
★  newton
★  mini spool
  no locker
  pryor week 9
  terrelle pryor
  limited-slip differential
  christian ponder
  arb locker
  electric locker
  ponder
  lock right
  limited slip differential
  andrew luck
  welded
  open diff
  lockright
  trac loc
  matt hasselbeck
  tannehill
  tebow

Your alternative for locker is not listed? Suggest!
Speaking about locker, one probably shouldn't forget about limited slip.

Other search terms related to locker and their ratings are:
★★★★★ limited slip
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Google Trends

Scale is based on the average worldwide traffic of locker in all years. Click on graph for more.
locker
limited slip
posi