2004 9900i Rough Ride

I'm having a problem with the ride on this tractor. It rides terribly and I don't remember it riding this bad when I first started driving it. We've started with the basics, new shocks and leveling valve on the cab. New shocks for the suspension. The cab, however is almost impossible to move up and down, it's stiff as a board. Does anyone know if this was a common problem with these particular trucks? If I have to keep driving it the way it is, I'm afraid I'll wind up with back surgery at some point. Twelve hours in this thing and you feel like you've been in a fight with a 2x4 and lost.

 

I do have one, I want to say it runs a little over 15 psi when empty. I'll be in it in the morning and if it's much different than that I'll let you know.

 

Thanks D, it's a day cab, so there's no bunk and it's a single air bag with 2 small shocks in the center of back of the cab. You definitely can't move the cab up and down by hand as is customary with air ride cabs. I didn't know if it was just this particular model that maybe had that specific problem. When you say the ride height should be 6.5 inches. You are talking about the air bag on the cab, right? Also, how do you measure it, top to bottom of the bag?

 

Yep, that looks like it to me. View attachment 52847

 

What's the fix,new tork bar and getting it set right?