I really like B-fast diff balls and rings with AE clear grease last along time. I have test a gear diff to a ball diff in dirt and I'm always about .3 faster per lap with the ball diff. The gear diff maybe okay on a really high bite indoor clay?
I run my ball diff as loose as I can with-out it slipping. This is on out door clay hole shot kind of dirt. If I was on high bite bar code style clay I would run it a little tighter.
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