My Duster is under the knife....TKX going in

I'll have to ask the shop what they ordered. My old differential was a cone type (I think because I can see the springs). The new one is a brand new unit. This is the only photo I have of it before it was installed. Maybe someone can tell by the pic?

Thanks for the suggestion about figure 8's. I'll take it out today and try that.
New unit.
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Old unit

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Your new one is a clutch type (powr-lok). It's a very good unit. It probably just needs more miles on it so gear oil can circulate through it. I hope they used some sort of friction modifier.