Narrowing in on my cruise fine tuning. Found that the feared vacuum leak was not the case (holds 25+ pounds of vacuum with no loss) so I suspect the strange behavior (5mph increase in speed when engaged, surge when you hit coast) was VSS related. Had a new gear put on the VSS when I put the 3.73s in the rear and after hooking the vacuum back up again the cruise is behaving much better. Only a tiny increase in speed when you engage cruise, maybe 1 or 2 mph. Is this a sign of the VSS still being wonky, or is this the throttle actuator needing adjustment? I searched old threads but most of those go from "not working" to "working" without fine details like this.