Hey,
The truck in question is a 1997 Toyota Tacoma. 80K miles.

My problem is a vibration that occurs around 35mph and continues untill around 65-70mph. Even then it is off and on.

First I thought it was the universal joints, how can I tell that they are shot? I went under the truck and I cant tell what play should or shouldnt be there.

After doing some searching I wanted to check my differential. I jacked the truck up and moved the wheels. I was checking for abnormal noises, and i did hear a slight "smooth rubbing" noise, but nothing that sounded too bad. Should i have heard anything at all?

What should I check next?

Thanks for your help!,

Paul

 

Take the driveshaft out and take it to a driveline shop to have the joints checked and the shaft balanced. Also check the trans case output flange for looseness. The nut sometimes will back off

 

sounds like you need to replace u-joints and have shafts rebalanced