I had this problem with my volvo wia42tes 1995
I have cured it 100% but not without alot of effort!
first thing you have to know is if your truck has a volvo front axel ?? cause volvo king pins are very strange ! and seem worn out whenever you lift the front in the air !
I had my truck aligned and it was worse so I then put 3/8" of toe out in the front and that made the lions share of improvement ! but I continued with a new steering box , a new steering colum from the wheel to the box
new wheel bearings , new aluminum wheels all 6
new mich tires !
all this stuff made it a little better yet !
Then I tried new shocks on the front, gabe adjustables , wow big difference again
and the old ones checked OK but still the new shocks worked !
truck was now stabil at 70 mp on any surface
next I went to rear shocks they were new monroe gas , I replaced them with gabe adjusts , double wow they worked
then I special ordered the nylon tolerance ring for the lower king pins and installed them
And now my truck is perfectly stabil at any speed on any surface with any load !
order of importance is
1- king pins
2-toe
3-shocks
4-tires this is ..>> assuming you have checked all the normal wear points and joints first ofcourse hope this helps T
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