Does the engine do it when youre sitting still and rev it to the same rpms as if you were going 40 to 45? Sit in the driveway and rev it up slowly to see if it vibrates at some point. If not, you've probably got a transmission issue, front differential, or driveline problem like worn joints or motor/transmission mounts. If it does, you might have a worn out waterpump or fan clutch that vibrates at that certain rpms
SPONSORED LINKS
Sunday, February 9th, 2014 AT 3:45 PM