2005 Ram 2500 (48RE) vibrates when going 30 to 45 mph. Trans was recently serviced at dealer. Had vibration prior to and after service. Truck has 76000 miles. No vibration at highway speed and vibration is not as bad when in tow/haul mode. Any suggestions?

 

I would check driveshaft and ujoints. Do you feel vibration in steering wheel or in your seat? Check for any wobble in drive shaft while on rack. Is truck 4X4? Do you have off road tires?

 

Truck is 4x4 and I have BF Goodrich Rugged Trail tires. Feels like truck is vibrating. I plan on having tires rotated and balanced this week.

 

Driveshaft and U-joints are a good place to start, as BigIron70 mentioned. I have just finished dealing with the exact same problem. U-joints did not appear to be the problem at first, as they seemed tight. After 5k more miles, it was evident that they were the culprit. About the same milage as mine started to go also.

 

Thanks, the center u-joint was bad. Replaced all three u-joints with ones that have grease fittings and had drive shaft balanced. No vibration.