I am assuming your 2005 4/4 will have a Zetec engine? I have certainly seen 4/4s of this era fitted with the blue springs but they were originally specified by MMC for the +8.
The +8s from 1997 to 2004 (beginning of the long door to the end of the run) used the "blue spring" in order to give a "softer" ride that Charles Morgan thought was deterring some potential customers. Most folk think these are too soft for the +8 and rebuild them with one rated at a higher rate.
Sorry but I cannot find the reference to the numbers right now , but I am sure others will know them.
Spring rates are a matter of personal preference and ideally you should do some and trial and error testing.
My memory of Norwegian roads outside of the E6 is that they are not very good, (no offence just an observation) , especially after the winter snow and ice has melted, so you probably benefit from weaker springs to absorb the bumps and very good shock absorbers with weak bounce but strong rebound absorption.
Last edited by MOG 615; 09/12/15 10:42 PM. Reason: omission
