This has been a project in the works for a while since there are not too many aftermarket parts made for the J30. Have been doing research to figure out what other Nissan suspension parts fit to try and lower it.
A friend of mine that has a z31 300zx saw my front suspension and said it looked similar to his car. He let me try out the lowering springs he had and it worked. So for the front it has Z3R 300lb/inch 1.5" lowering springs. These normally lower the 300zx only 1.5", but it made about a 3-3.5" drop for the J30.
Next came time to figure out what would fit the rear. The suspension in the rear is very similar to the s13 and z32 300zx. So went ahead and bought some used JIC coilovers for a s13 since the J30 and s13 have the bolt though mount on the bottom. Only issue I ran into initially is that the upper strut mount were different. Luckily it was able to be swapped and installed successfully.
Completely Stock Ride
Stock Ride Height with G35 Wheels
Front lowered first in Sept
Now for the rear
Let me know what you guys think!