There is a clicking noise when you release the gas. Could it be the cv shafts.

Have over 140,000 miles on it.

I have seen them be the problem but I haven't seen it to verify it. Have someone verify it.

I believe at the front. It was vibrating slowly and got worse on the highway.

could be mounts or poss axle but without seeing it i would only be guessing. have it ck'd by your mech