Prop shaft ballance

[jacjac]

I have a high speed shake that I have experienced for the last couple of years without being able to solve it. It starts at around 80mph and increases with speed. It's not terrible but very anoying especially on a long run. I've recently had the wheels balanced and a full geo set up. Engine mounts are new too. The car has had an expert check over up on a ramp and all appears to be in order.
I wondered if any of you have had an out of ballance prop shaft, before I spend some hard earned on getting it done. Can't think what else it could be?
It is only there in 5th gear - not there at the same revs in 3rd or 4th.

[v8sag]

prop uj's? gearbox mounts? Wheel bearing,warped disc, unlikely. diff mounts and cv's would show other symptoms.

[blueg33]

Before you go and get the prop shaft balanced, make sure all the uj's on the shaft are properly packed with grease and not too worn. I had a similar issue and proper greasing sorted it it, when the joints started to dry out again the vibration came back.

[v8sag]

Forgot to add, diff pinion bearing and side bearings, worth a look too.

[Alexdaredevilz]

edit, i read post properly

Edited by Alexdaredevilz on Wednesday 27th October 20:20