Solved a lot of the annoying squeaks, rattles, and groaning/chatter noises from the car this weekend after reading a lot of old posts.
Use red permanent loctite 262 in door striker. Drip into pin that is pressed in, let it dry 24h, no more rattles from door. If this fails, I'll use a punch and mesh the pin to the plate and re-loctite it.
Rear end noises that sound like wheel bearing, loose hub bolts, or brake/dust shield drag (but are not):
Change LSD differential fluid in the Getrag diff. Use Royal Purple 75w90 Max Gear with LSD additives. This solves the chattering/binding feeling at low speed turns, and somehow makes the car way smoother to drive. I had changed it to Mobil 1 75w90 LS, but that actually made it worse than the sludgy factory fluid that was in there. If the noise comes back, I'll add 2oz of Genuine GM Fluid 88900330. You need a 10mm allen key and don't need to lift the rear to change the fluid. A fluid pump is a must, and the car should be level. Take the fill plug off first before draining to make sure it's not stripped/stuck.
Front end squeaks when going over bumps:
Grease front swaybar bushings using Permatex 22058 dielectric grease. The 4 15mm bracket bolts are easy to take off once you have properly raised and secured the front of the car. Once the bushings are removed, clean the entire bar area, bushings, and brackets before running a liberal bead of the grease on the inside of the split bushing, as well as the channel of the bracket.
Check hood by pushing down near window edges. If you can move, open the hood and turn the rubber striker a half turn and test again. Make sure the hood doesn't rattle AND you haven't changed the transition lines of the car (along fender, between door and hood). While you are at it, spray white lithium grease on the hood latches, and grease all the hinge points, including the hood lift assist shock ends.
If your shocks don't have visible oil and you get odd squeaks, this may help. Use the silicon spray (like B'laster 16-SL Industrial Strength Silicone Lubricant with Teflon) on all ball joints and in upper and lower wishbone bushings. Don't get any on your brakes
Top maintenance, especially for pinches and retraction issues:
Use the dielectric grease to refresh your weatherstripping, and also liberally apply to the folding weatherstrip in the top. Retract top half way, reach between into the part that hits the fabric and make sure the metal as well as all the visible rubber has fresh grease on it. Do this for the windshield frame rubber, as well as the door/window sash and all visible weatherstrip around the door/trunk. It works pretty well as a "back to black" treatment as well. Remember to get some on the little flappy doors where the frame and cable lift them up. Check your cables and cable clips while you are at it, and replace with these https://www.amazon.com/Red-Hound-Aut...dp/B0146YPHP8/
Replace the RC car antenna with the shorter Opel one, looks way better and doesn't bend as much at speed. https://www.amazon.com/gp/product/B007RP5BA0/
Still have to tackle:
The car is much quieter now, but now I need to focus on the rear center cupholder rattle, and the garage door opener rattle.