Helical cut or Straight cut Diff Gears?

[Mike_D]

Serum is right shimming is the most important part of good strong diffs. Althougth since i have replaced my Twin force with helical diffs i have not had any problems. And this is using the same shims as i had with the straight cut diffs. The point is you just need to get rid of any slop but at the same time not too tight that it will cause any binding.