Nope. The FJ diff is considerably bigger than the mini truck diff. And I'm pretty sure an FJ diff uses C-clips to keep the axles in the carrier (my '81 BJ60 does anyway). I've got an extra BJ diff from my cruiser if you need it (slightly worn and I don't know what gear ratio).
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'82 Toy P/U with rust
SQUIRREL POWER!!!!