ball diff works better on low grip in my experience, and surprisingly little adjustment can make a good difference to handling too. if they are built well with good lubricants they can also last quite a long time too, the one in my 2wd has done all this years welsh league meets and several hours on my local track and is still silky smooth without a rebuild... personally i think i would stick to ball diff in 2wd whatever the grip as it will be more predictable, but in 4wd gear is fine
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