Dodge Ram Tire Flat

I Have A 2006 V6, 6 Speed Manul Box 1500ram , When I Drive On 5th Gear On A Flat About 50mls , I Can Hear The Rear Drive Axle And The Gear...

2004 Dodge Ram With 20" Wheels. Pulls To Right Significantly And Has Recently Started Shaking While In Motion. Thumping Sound Can Be Heard...

When Cruising Down A Road Rpm's Go From 1 To 4 And Not Very Accurate Like It Use To Run And The Road Is Flat And Should Not Have To Do That