Vibrations between 40 and 50 mph

Hello folks,

I've been having an issue that seems to have been covered on here a few times but I haven't had any luck as of yet. I have a 2015 Tacoma TRD that vibrates from the front end when driving between 40 and 50 mph. This issues does not occur in 4WD, while driving downhill or with RPMs exceeding 1000. The vibrations are predominantly happening on the floor of the vehicle and possibly a bit in the steering wheel and dashboard area. So far I have replaced the needle bearing and had transmission fluid changed. Then the transmission was replaced altogether followed by new tires. If the tires and balancing isn't an issue and neither is the transmission, what could be the problem?

 

Check your steering components. Tie rods, ball joints, etc....

 

Thank you for your advice and quick response! Much appreciated.