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1, Measure the rear chassis height:
I have some thoughts about lowering the car at the rear end. Not very much, something like 10 to 15 mm. I have to draw some plans for this, a spring lowering kit with springs, coil over springs or maybe some air springs if it's available. First I must investigate what's installed today I also noticed that the car is a little bit lower on one side, at right rear.
Rear spring height right side:
Before looking at the springs I check the height of the car at rear. I measure from the center of the hub to the edge of the fender at top. Earlier I have measured the front left and right height, in that case it was exactly the same.
I get the distance to 382 mm from hub center to top fender edge at the right side.
The height of the left side is 393 mm, a difference of 11 mm. Not much difference and it can change dependent of how the car was parked. A more carefully measurement gave 8 mm.
These measurements are according to the right arrow then it doesn't matter what size of the tires I have. From center axis to fender: left side 393 mm, right side 382 mm. This is a 19x9.5" wheel with a 275/30 19" tire, the problem was the same with the standard size wheel/tire I had earlier.
The area around the springs is very narrow and difficult to see. I need some tools for this.
My girlfriend has this instrument, it's an endoscope. The camera is the cylinder at right which you can move into narrow spaces. It connect to the smart phone wireless through WIFI.
The camera at the end, it has a diameter of 6 mm. At the top of it's a LED light, the brightness of it can be controlled on the other end of the cable. A very handy tool.