hi,

When my sportage reach 3000rpm-4000rpm there is a strange vibration I get the vibration even if im in neutral but its getting annoying when im on 5th and reach 3000rpm(100km/h). There is no vibration if I dont go over 3000rpm.
Also I noticed that the head gaskets started to leak few weeks ago.

Any ideas where the vibration come from?

Kia sportage 2000,DOHC 2.0L, 4 doors

My tire are properly balanced,I instaled 2 new needle bearings last week with new seal.

4X4 Sportage 2000, Warn manual Lock,BF M/T 30x9.5