Sounds to me like a planetary bearing. On Sunday, 14 December 2014, 15:20, Ronnie Hughes <dmarc-noreply@xxxxxxxxxxxxx> wrote: Okay, I drove my bus a couple of hundred miles this weekend and when I'm cruising down the highway I can hear a low roar or rumble. If I coast it continues, but if I push the clutch in it stops. I replaced the clutch, throw out bearing and pressure plate when I was rebuilding the bus so they only have a few 1,000 miles. I replaced the rear transmission mounts, but not the fronts. What do you think? Ronnie