throttling vibrations between 45-70mph

Hi everyone first time stating a thread. I have a used 2005 Prius w/ ~125k miles; got it at 109k. I’ve owned it for 2yrs; within the last year it has developed a severe vibration from within the engine compartment between 45-70mph and when the engine is throttling; incrementally getting more pronounced- worse. I noticed it upon return from a long 5k mile roundtrip roadtrip around the national parks of Zion-Yellowstone-Mt Rushmore; there I had first used the B-gear for an extended period of time descending Colorado mts-- going eastbound. If I were to coast and decelerate below through the 45-70mph, I don’t get these vibrations. Also i just got a new set of 4 new tires (new balancing as well) and the symptoms are still the same from the old and new tires. Example in warp glide mode, when I gas up thru 45-70mph, I get notable engine compartment vibrations. Also I get these on longer trips at +1hr into the roadtrip; from coldstart in the morning to work, the vibrations are not noticeable; but more pronounced on longer building trips.
Big thanks.

 

ok moving this thread to... thanks
Gen 2 (2004-2009) Toyota Prius Forums

 

Team,
thanks for the info.
The car is now working like new; me thinks the CV axle change was the biggest with the other perhaps helping out, but nomore vibrations as i just conlcuded a 500mile roadtrip:
- CV axle change out; the inside boot was shredded and fell out as i swapped out the left driverside hub/bearing;
- transmission fluid change
- both front bearing/hubs change
- sparkplug change
- overhead gasket seal

 

Cost was only for parts as i performed all the labor; YouTube vids were necessary.
- $80 driver side CV axle replacement
- $5 MAF & throttle body cleaning spray (OBD2 sensor directed 2 codes for me to clean)
- $70 right/left front hub/bearing
- $60 right/left rear hub/bearing
- $80 right/left front disc rotors
- $60 right/left rear drums
- $36 toyota parts 4 qts ATF W; transmission fluid change; pretty pricy from Toyota dealer
- $68 change 4 iridium sparkplugs / 4 boots
- $15 overhead gasket seal

this car is back to hummmming; should be good for another 50k miles