I have a 2001 international 3800- dt466 250,000 miles. I've had the rear axle changed from a 5.38 40 spline to a 4.44 36 spline axles. I've only had it about a year. It had a horrible vibration, so we had new steer tires installed and we also had the king pins replaced. While it is a lot better when it comes to vibration, there is still a mystery vibration, bounce, shake around 63-68 miles per hour (according to my GPS). Run it up to about 70-73 and it does okay. In comparison it my old bus, it's horrible. But I also never ran my old bus over 60ish. It had Dayton wheels, this one has budds. Unfortunately, Ive had three different shops do all my work. One for the rear. One for the tires, and one for the king pins. I took the bus back to the king pin people (very respected repair center) and they can feel it but have been unable to narrow down an exact cause. They recommended I have ALL tires spun balanced. Something about the "inner dual" being "off" when they ran it on jack stands. Anyone else experience this type of issue?
Current Bus - 2001 International 3800 IC - DT466e Allison 5 Speed Automatic - Still Yellow
Previous Bus - 1999 International 3800 Blue Bird DT444 AT545 Allison Automatic - SOLD
First Bus - 1993 Ford Econoline Shuttle Bus - Scrapped