As the matter of fact, my current shocks are short, so I am planning to get a set of longer shocks for my 3.5" suspension lift. Now, the distance between the front bump stops and the upper pads surface is like 8.5cm plus 1/2" of pad compression, so that is about 10cm in between; for the rear bump stops and upper pad surface is like 8cm plus 1/2" of pad compression, then the total distance in between for the rear is about 9.3cm.

According to the figure above, what length of shocks should I get? My current shocks are 60cm long when extended, however, with the vehicle parked on the ground, my shocks measured 56cm long, so that only give me 4cm for flexing. I think my shocks are indeed too short.