Vibrating Gt4

[GT-FOURNZ]

when im goin down a hill in 4th gear with no throttle aplied i get a real bad vibration and when i aply the throttle it seems to disapear. can any1 tell me whats goin on

[4afte]

does the car vibrate or is it the steering wheel?

[GT-FOURNZ]

its the car. only when in 4th doin bout 70KPH with no throttle aplied

[4afte]

well without applying throttle you are using 'engine braking' to slow you down, maybe it needs a little help from the brakes are slight amount of throttle to ease the demand of slowing your car down hills.

[led-gt4]

i would also say engine breaking but couldnt tell without driving it. no noises out of the gear box?