I put 20 in rims on my 98 blazer 4wd. Sometimes I get a wobble between 45 and 50 mph, but not always. Sometimes is shakes past 50 and below 40, but its inconsistent. I changed the pitman ARM and both inner and outer tie rods but it still does it. Please help.

 

What about idler arm , upper and lower ball joints , Wheel bearing , Tire balance? Those are just some of the things to start with .

 

alignment?