hi all, can anyone help ive just bought a series 3 88 diesel (my very first landy)and changed the old broken leaf springs a crappy shocks.but since doing so there is alot of vibration as i pick up speed and it will only get to about 45mph flat out and slows to around 30/35 on a very slight hill but it used to get to 55 easily and would climb a mounting last week before changing the rear springs can any one shed some light on what might be wrong? regards