| Not really Urgent, BUT...
The truck I just bought has only ONE weird problem that I have never seen before. Here goes, and ANY suggestions or comments are accepted...
The Wife and I took the kids to the mall today in the new rig, the '02 3500 dually and we went via the highway. Well, here is what has me baffled, everything rides and runs good until I get to 78 MPH, then I get a vibration in the seat of the pants/ through the seat but not through the steering or suspension. However, it goes away when I reach 85 MPH. Also, it has the 5spd Allison, but the tranny temp never gets above 150* and the fluid level is fine...
I was thinking u-joints, but I was thinking that if it was the u-joints or the drive shaft being out of balance then the vibration would be all of thee time regardless of speed?...
There are absolutely NO other problems at all. I don't get it???
Anybody ever had this???
Thanks
Chris |