Not Ranked
For what it is worth I have tried a Detroit Soft Lock, a Quaife, and a clutch differential in a Dana 44. This is on an independent rear so may not be applicable to your 9", the Detroit was undrivable it would lock and unlock very unpredictably and really screwed up handling, Straight line performance was great however. Under hard cornering the Detroit unit and the Quaife would both spin the inside tire (lightly loaded ) and really slow corner exit. The clutch type diff worked the best in my opinion. Ditto on the axles I have 19 spline and twisted one off with the Detroit soft loc. I am going to try to have some 31 spline stub axles made for this diff (Jag).
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