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Any idea how much work it would be to add ASD to my wagon.[/QUOTE]

As you said, the ASD diff, hydraulic lines, and connection to pump. There is a valve near the axle that allows the fluid to circulate fore and aft, and then be sent to the diff when called for. The big issue is wiring up the ASD control unit "black box" with it's many inputs needed. Dave can explain why he did what he did to his car, and left it LSD only.