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Adjust the bolts at the outer end of the spring, so that less treads shows. If you cant lower it enough that way. You can change the stock 8"bolt, to a 10"bolt.
I can recomend van-steel for parts like that.
You can change it by adjusting the spring bolts. These are the bolts at the end of the spring conecting to the control arms. Tighten them to raise r.h. loosen or use longer bolts to lower r.h. This changes suspension geometry so, for one, you have to have the car alined after, and secondly, don't go too far because any change also effects the various linkage geometry, meaning even after an alinement(which only effects static wheel position) the suspension's geometry is now changed and compromised, so weird things can happen while actually driving.
Thanks. I am looking to lower it a bit. The previous owner has the car sitting a bit high in the rear. Can I do this without lifting the car?
Yes, you will have to raise it, not only for better access, but to take pressure off the spring bolts. You will may have to jack the spring itself also, put a C-clamp or large vise-grip on it to keep the jack pad from sliding up the spring.
Be cautious of some cheaper after-market long bolts for lowering the rear.
A couple of club members here in Oz had issues with the bolts shearing due to inferior quality. In both cases, luckily they were not travelling fast and only gouged the bitumen as they pulled to the side of the road. At higher speed, could have completely lost control.