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The rear end sag is probably due to tired springs. They don't hold the rear up as high as they should when they get old. The differential mount could also be tired.
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I think I am already determined to replace the springs.
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The hard shifting is most likely vacuum related. Danged near everything, or so it seems, is run off vacuum in these cars. Door locks, engine shut off, EGR, transmission shifting quality, climate control, and various other things depending on the year and model. Do some searching on vacuum leaks. When the system starts leaking the transmission doesn't receive the proper amount of vacuum which causes hard shifting.
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I suspected it would be vacuum related and I am glad that someone validated that for me. However, everything everything else seems to work properly that depends on the vacuum system. I remember, a while back, one of the mechanics was playing around with the throttle linkage. I don't know if it may be backfiring on me now.
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You clunking noise under changes in acceleration sounds like a bad flex disc on the drive shaft. Or the center bearing on the drive shaft. The flex discs are what hold the drive shaft to the transmission and differential. The center bearing is what supports the center of the drive shaft. This is an important one to not let go. If one of the flex discs give out your drive shaft will flop around under the car. And at highway speeds you can imagine the damage it will do. Climb under the car and inspect both flex disc. Your looking for cracks or miss-shapen rubber. For the center bearing wiggle the center of the drive shaft back and forth some, it should move like 1/2" to an 1" to one side or the other, but no more than that. Also look at the rubber.
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This is definetely something to look at. I will make sure that this is checked soon. I will post my findings as soon as I get that taken look at.
Thank you all for your comments. This has been very helpful.