I have a 95 S-10 Xcab 2WD with a 4.3 V6. The truck is new to me and has nearly new tires. At hiway speeds between 30 and 40 mph a bad vibration starts up and peaks about 35 mph. I have swaped both rear tires with the front with no affect. Braking makes no difference. Takeng the engine out of gear makes no difference. I've noticed there are 4 UV joints with three drive shafts in this truck. I can't feel a lot of play in the differential gears or in the wheel bearings. Anyopne seen this problem before? I sure could use a pointer on repair or troubleshooting here.:sun: