The best replacement for c10 is k10.

The best alternatives to c10 are rated as following:
★★★★★  k10
★★★★★  c20
★★★  f100
★★  s10
★  c20 chevy
★  c9
★  638
  chevy k10
  c9 memory
  c15
  r10
  smx c20

Your alternative for c10 is not listed? Suggest!
Speaking about c10, one probably shouldn't forget about corvette rear end.

Other search terms related to c10 and their ratings are:
★★★★★ corvette rear end
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c10
k10
c20