new SVX owner has questions

[radad]

Got a 92 lsl from my son a few weeks ago. He got it to restore but lacked the funds and time. Engine is strong and smooth. Glass has very little scratching. Body has 3 finger size holes, but otherwise looks clean. Two front wheels are in very good shape, but the rear wheels are hopeless. A previous owner had it painted black. the interior is mint & never smoked in and every electrical devices works except the sunroof sometimes won't close all the way without help.

I got this car knowing a very little on SVX's history and knowing it would not be cheap to run and repair. But I LOVE this car. After getting some exhaust work done, riding on the interstate with the radio on, I noticed I could not hear a semi next to me, I turned the radio off and still could not hear the semi! Quiet, smooth and a small dose of quickness that handles like a dream. How did it take all these years for me to find out just how cool the SVX's are?

So far all I've had done is some exhaust work done and replaced all 4 rotors & pads. I had the car on a lift with my local mechanic to find what I thought was a bad u-joint or cv. Everything looked good all the cv's the drive shaft etc. 3 guys were checking it out and could not find anything wrong. So the head monkey took it for a drive. He came back with the most perplexed look and said man I have no idea maybe you can take it to the tranny shop and they might be able to find it. I can see i'm going to have problems finding anyone to work on this car.

I got home and read a bunch here and other internet resources. I found out about the FWD fuse and popped one in a bada bing bada bang no more weird noise's. Does this mean the problems in in the rear drive? I been driving it in FWD for two weeks now any long term damage from doing this? Also I would like to know if replacing the oil/trans/diff with mobil syn. would be a good idea?