First of all, I assume no responsibility for anything you attempt based on these instructions.
So you need to replace your struts. Here is a short write up describing how to replace the rears.
I used KYB GR2/Excel G 341012 from 1981 Nissan 280ZX non turbo.
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To start youll need the following tools:
14mm open end wrench
Phillips screw driver
First of all, youll need to raise the rear of your car and set it on jackstands.
I tried at first to do this without removing the rear wheels but found it was mandatory as there was nowhere to pull the struts out.
Youll see something like this.
Now we need to open the trunk and remove the cover hiding the fuel tank and rear strut tops. This is done by removing 7 plastic upholstery fasteners. Simply unscrew the center of them with your phillips screwdriver and pull them out. Put these in a safe place. There are 3 along the top and 4 along the middle. The bottom is held in by the 2 mounts where the bottom of the cargo net clips to. I pulled the center of the clip out using both of my thumbnails and then pulled the inner part out as well. Pull the cover panel out of the way.
After removing the panel, on both sides you will find a rubber cap over the strut towers. Just pull them off.
Remove the 2 12mm nuts from the top of the strut.
Remove the 17mm bolt from the bottom of the strut.
Push it toward the center of the vehicle and it should slide off the bottom mount and come down. Pull the top out first towards you and you have your old strut assembly in hand.
Now attach your spring compressors. Your style of tool will vary as will the tools needed to compress them. I used a cheap set from Harbor Freight I picked up several years ago and have used them on many spring/strut installs. Tighten the tools until the spring is able to move slightly between the bottom perch and the top hat.
Take your vice grips and clamp them at the top of the strut to keep the shaft from spinning. Use the 14mm wrench to remove the top nut.
Remove the top hat and slide the old strut out of the spring. Take your new strut and slide the spring over it and line up the end of the spring in the perch. Put the top hat back on and install the nut using the vice grips and 14mm wrench.
One thing you must pay attention to is the orientation of the 2 bolts on the strut hat in relation to the bottom of the strut. You must line them up how it would bolt into the car. If you do not line it up you will not be able to install them and will have to compress the spring again to get it right.
Once your sure you have it lined up, remove the spring compressors and install the strut assembly. Attach the 2 12mm nuts loosely to the top so you have a little give to slide the bottom of the strut onto its mount.
One side of the mount is slightly larger than the other. The mount on the control arm has a small step on the inside where the larger end of the strut goes.
Tighten the 2 12mm nuts on the top of the strut and the 17mm bolt on the bottom and bolt the wheel back on.
Remove and install other side, replace rubber strut caps, cover panel and install the upholstery fasteners. Remove jackstands and lower car. Now your done.