Prop shaft problem?

[AlanBrown1954]

Morning all, I recently purchased a 2006  s type 3litre petrol. I have 2 problems, the first is when travelling from approximately 40mph and above, what I would describe as a droning and a slight vibration becomes very evident from the rear, lifting your foot off the gas makes no difference, the droning continues until you get below approximately 40mph. Could this be a prop shaft problem?

second problem is, whilst your foot is on the gas at any speed there is a slight, what I would call, humming from the back, as soon as you lift your foot off the gas the humming stops, put your foot back on the gas and it starts. Possible diff problem?

Any thoughts on either of these would be most welcome.

Alan 

 

[LairdScooby]

2 hours ago, AlanBrown1954 said:

the first is when travelling from approximately 40mph and above, what I would describe as a droning and a slight vibration becomes very evident from the rear

It could be a number of things, my favourite guess would be propshaft centre bearing or tyres. Old tyres can be incredibly noisy, especially if they've developed a carbuncle orother deformation.

2 hours ago, AlanBrown1954 said:

second problem is, whilst your foot is on the gas at any speed there is a slight, what I would call, humming from the back, as soon as you lift your foot off the gas the humming stops, put your foot back on the gas and it starts. Possible diff problem?

Could be related to the first problem, seems like you need to have a good check over everything on the back end.

[AlanBrown1954]

Thanks for your comments, I have brand new Pirelli P7's all round so I don't think it is related to the tyres.

I agree with you, I do think it's to do with the prop shaft. I just need to find somewhere to have a look.

Many thanks

Alan 

[AlanBrown1954]

Can anyone recommend a reliable company to have it checked?

I live near Ramsgate, Kent.

[LairdScooby]

Still worth checking your tyres though, also your exhaust may have a minor leak causing a drone/vibration or even just a missing hanger.

Without hearing and/or seeing the car, this is one of those things where every guess is a needle in a haystack, could be a wheel bearing even.

[JustBadly]

Start with the basics, check the diff Oil level. It takes about 750ml of fluid and is simple to suction out and refill, not a bad idea since original 19yr old fluid will be in there. I use Smith & Allen FS 75w-140.

[AlanBrown1954]

Thanks very much for your comments.

Regards 

Alan