I have at 01 Tacoma 4X4 V6 5-Speed. I bought it used with 39K miles.
If I try to get up to speed quickly from a stop I usually shift around 3000 rpm or higher. The engine is really smooth up to about 2800 rpm but right around 3000 rpm there is significant engine vibration. I can really feel it in the gas pedal and the clutch and in the steering wheel to a lesser degree. If I rev the engine above 3000 rpm the vibration lessens but it's definitely still there. The vibration is very pronounced in 1st through 3rd gear. When I'm in 4th and 5th gear I don't feel it as much. But, in 1st though 3rd I don't even have to look at the tach or hear the engine to know when I'm at 3000 rpm...I can feel it in my right foot.
I usually shift around 2500 rpm so most times I'm don't deal with the vibration.
Initially I thought maybe I had an engine mount problem but I haven't really begun investigating. Thought I'd start in the newsgroup. Thanks for any help.