Hello -
Based off what you have said and the number of miles it appears to me that your U-Joints need replacing. They probably don't have grease fittings on them. The replacements usually do.
I would also suggest having your drive shaft rebalance once it is off. You can check at several different truck repair facilities and some have balance shops right there. We have a local semi truck repair facility near by and next door is a shop that specializes in drive shafts and universal joints. Since many have to be pressed on.......I remove the drive shafts and drop them off there. They replace the u-joints, rebalance the shaft and back in no time.
If you need more assistance, to better assist you please tell me the model of your vehicle. Is it a  ton or  ton....... Also the engine size in liter and the 8th digit of your VIN.
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Thursday, December 18th, 2008 AT 2:46 PM