I have a 90 CRX w/B18C and recently I have been having a hard vibration when the car gets above 3000 RPM. At first it was just the Front Passenger side that was doing it. I raised the car on a lift, took the tires off and it still did the same thing. I replaced the axles and it still did the same thing. Last night I swapped the transmission because it was grinding in 2nd gear and when I put it on the lift again the Front passenger side is fine and now it vibrates on the front drivers side! Any help would be greatly appreciated. Thanks in advance.

 

I would check all your motor mounts first...my bro has the same problem..do you feel it in the wheel??