Yes, that sounds familiar. Two possibility here. It might be something as simple as Tranny Fluid service time. However, the symptoms you are describing make it seem more like the OD relay has partially failed. You may just need to disconnect it, clean the spade connectors and reconnect it. You may need to replace it entirely. Here is a picture of where to find it.

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89 Raider - V6, Automatic, rear LSD, A/C Retrofit, Cruise Control Retrofit.