saph in dorset

Hi,

i have just converted my saph from the mt75 gearbox to the T5 gearbox.

all is fine untill i reach over 80mph and let off the throttle, when there is a vibration that shakes the car. it is eadily seen through looking in the rear view mirror as everything is vibrating.

all was fine before i changed the gearbox, have checked to make sure everything is tight as much as i can but cannot figure out where the vibration is coming from, as its is fine below 80mph. it does it if i accelerate slowly to over 80 or if i do it quickly.

any ideas would be much apprecitated as have to go on the motorway tomorrow and dont want to cause any damage if i stry over the speed limit.

Adam

MannheimAlex

My guess would be the propshaft... grab it and check for any play in it

tabetha

I'd also look at the prop first, make sure the shims are in place under the bearing support housing.
tabetha

saph in dorset

What do you mean shims I have never had shimes under the centre support.how thick should the shims be as I can make some up?
Also what is the best upgraded gearbow mount have looked at the vibratechnic ones but are there any beter ones.