Editing HICAS - Removal (section)

===Bushes===
The R31 rear subframe is supported at either end by thick rubber bushes. These bushes have hollows in them to allow the subframe to pivot. These need to be replaced. The cheapest solution is to buy aftermarket Z31 rear subframe bushes from the states and have them modified to suit. Noltec also make subframe bushes for HR31. The Z31 bushes will tap in while the noltec items have a steel shell and require a hydraulic press to install.
Urethane is solid stuff, and will remove all measurable movement in the subframe while still isolating vibration from the chassis and maintaining some compliance. It will easily last the life of the car in this situation.
Z31 bush mod: The bushes will fit into the subframe fine, but they are slightly too thick to fit between the chassis and the lower bracket. About 6mm in height needs to be skimmed off the top bush on a lathe.

http://www.noltecsuspension.com/popproduct.php?id=N92962&vhcid=536&brand=NISSAN&series=SKYLINE+R31++++87-90

http://www.thezstore.com/page/TZS/PROD/PSDC06D/23-4148