i have an '87 rx-7 and recently driving i notice intense vibration from the rear end at low rpm's in 3rd, 4th and 5th gear. in 1st gear if i step on the gas a bit i can hear the rear end knocking. not sure if it's my trans. crossmember bushing that's blown out or if it's a rear axle bushing. any help is greatly appreciated.

Thank you,

Tony

 

shaking gets continuously worse. any help is really appreciated! please!