this has been discussed in a few threads. dont use synthetic oil for you kaaz diff. they coat the discs and cant be cleaned unless you do a full rebuild. it wont engage/disengage as smooth as it should. Either buy some tomei/kaaz oil or go get some castrol 80W90(or whatever non-synthetic Gl-5 you want) , and put a tube of Ford limited slip additive which you can pick up from your local Ford dealer.
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