This what happened on my diff and what I did to fix it.
I would be tightening the diff 1/4 turn at a time, them spin it a bit to bed it in. Then eventually I would hear a loud click and the diff would go all tight and hard spin, but the diff gear would slip.
The diff screw was pushing the diff spring up to the diff nut rather them compressing the nut down on to the diff spring. There maybe a bur on the diff spring or on the diff screw which getting caught. By removing these burs, this allowed the spring to freely slide over the diff screw.
I have about a 1.0mm cap between the diff nut and the outdrive cup.
In the second kit, the diff went together first go and I've had no problems when using it.
Hope this helps
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