I have a '95 SR5 4x4 and recently I noticed once I get up to around 55 mph it would begin to shake/vibrate. At first i just kind of dismissed it as needing a tire rotation, however, it only shakes when accelerating. If I let off the gas at around this speed it stops. I have been through some pretty deep mud lately, could I just need to lubricate the prop. shaft or where should I start looking? Now I'm down to about 35 mph before it starts. Help! If anyone knows a good shop or person to help diagnose around Albany, Ga let me know.