Hi
This truck has been a bit of a problem for us, when first diagnosed over a year ago the truck would reach top speed and then start violently shaking. We narrowed this down to what we thought was the support bearing for the dive shaft/u-joint. We bought the world most expensive service manual for this truck and followed it to a tee. Hooked everything back up and the truck ran great...for 2.5 months.... then it started again. This time we replaced the u-joint, as well as the support bearing and hooked it all back up and success for 6 months. Now we are into it again only this time the symptom seems to be slightly different. When at half to a quarter throttle the truck starts shaking. Only at that point anywhere else the truck is smooth as can be.
Has anyone any experience with this, if you work for a doosan dealer is there a tsb for this?
Any help would be greatly appreciated

Thank you