every time I start my landy up from cold there is a really bad squeal from I think one of the pulleys,eventually when hot it goes,it's a v8 3.9,could it be bits of crap picked up when greenlaning,dodgy belt or bearings,any ideas would be appreciated also if I squirt a bit of WD40 the squeal goes for a few seconds but comes back until warm
 
Have you tried properly tensioning the belt?
Also check the water pump and PS pump for bearing play.
 

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