4700 drive tires

I think I made a mistake. My 4700 had Michelins on it, and I needed new drives. Moneys tight so I bought a set of Sailun S753s. Chinese tires. They actually got decent reviews. The truck runs 2 or 3 days a week max, and I'm strictly local, and I'm loaded fairly constantly at around 18K. Mechanic truck, so load really doesn't change much. I didn't think the tires would make that much difference. I think I screwed up though. With the old drives, that thing tracked straight as an arrow on the highway. Unless I was in ruts or crosswind or something. Always handled just fine. As soon as I put these Sailuns on, now it "hunts" sometimes. The steering becomes real squirrelly and it wanders left to right slightly, like I just wore out a kingpin or tie rod end. I mean, it is possible I got worn steering components, but it drove straight on Thursday and on Friday after I installed the new drives, it wandered. Has that happened to anyone else? Install new drives and now it steers funny? These are 1/2" smaller in diameter than the Michelins but since the Michelins were so worn, I don't even notice a difference in 6th gear. Aggressive tread open shoulder because I'm on dirt roads sometimes. I don't even notice tread noise. Thanks

 

Well, as usual if I just waited a little longer, I'd sort it out. The answer was grease, sort of... isn't it always? I lubed the front end, and she ran straight as ever. So I guess that means I do have something loose up there. Or I should grease it more. Either way, I'm all good.