Lift 3”

Hi my name is Alfredo
I live in London and I have a Jimny 2002
it have 2” lifting and at this moment want to improve the suspension Buy new springs and new shocks and maybe options for 3” lifting 
what more parts I must buy for this alteration 
And someone knows a good garage to do this in London 
Thanks 

You are going to need either castor correction bushes or castor correction radius arms. Bushes are relatively cheap compared with arms but do need a bit of care to make sure they are in the correct orientation. You will also need panhard rods to recenter the body above the axles. Longer brake flexible pipes too as you don't want to suddenly loose brakes if the axle droops on undulating terrain. Given the main reason for a bigger lift is to fit bigger tyres you will probably find the gearing is off once you go beyond a 235.75r15 and that really starts getting expensive. Now there's ways and means of saving the odd quid along the way but if you are wanting it to do anything like a decent number of road miles with something like nice manners then you will be in the hole with your budget. Or you trailer it to where you want to use it. As for a competent company in town to do the work I have no idea being in Yorkshire.