P38 Vibration. Help!!!!

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Istanbul2505

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Please, please,please help. I have a 1996 P38 that has got a vibration at 40mph. As you start to accelerate it is fine, when you pass 30 there is a small vibration getting worse when you hit 40mph. Once you pass 40 and go faster it dissappears!!!

I have had the wheels balanced, replaced all UJ's and the donut on the prop. Just replaced the rear diff yesterday and STILL in vibrates.

Any ideas welcome!!! The only thing left I can think of isthe the prop needs balancing, then I am stuck!!!!

Please help, thanks. :(
 
I had exactly the same problem. Changed all suspension bushes and front ball joints and it was gone. Not saying this will solve it for you but worth a look.
 
Hi, thanks for all your help guys but all 4 tyres have been changed and balanced since the problem started.

I think I am going to have the prop balanced next week, so we shall see what happens. In the mean time I shall just have to put up with it!!!!
 
tonymccandless said:
Take the front prop off and run it for a couple of days. It will take you 30 mins and at least then you can rule that out.

Btw you will also get better fuel consumption and great fun on roundabouts :p
Click to expand...

Screw the front diff up though wouldn't it? Must be some drawback or all the 'tarmac terrorists' who only get near off road on a grass verge would all be having their front props removed.
 
Why would it screw the diff up ? It is actually something a lot of people do on Freelander's to improve fuel consumption.

Of course the drawback is we all bought 4x4's and if we wanted rear wheel drive only would not have Land Rover breed cars.
 
Is it not possible that if the diff isn't actually 'driven' (via a prop) that it could 'wind up'?

I'm asking from a serious point of view at the moment, it would make more sense to remove the prop for the amount of time it spends off road (none) and as for being 4x4, I just wanted a Range Rover, not arsed about ploughing through rutted trails and making the jobs to do list longer than the car is capable of managing by itself without me thinking its a monster truck.
 
The diff will be quite happy with no prop. Most 4 X 4's can run in 2WD by operating a lever on the transfer box to deselect the front drive, unless they have free wheel hubs the diff continues to be driven by the wheels with no problem.
 
RWD Range Rover coming up. I'll also take note of the fuel mileage.
Averaging about 10 round town at the moment, school run so will keep an eye on things.
Sorry to the OP for the hijack.
 
Easier life for the viscous-coupling too. From my experience of running without a front prop for a few weeks, you`ll find the back end will step out very easily. Not what you want on wet roads, and if we get any snow this year.......!
 
It'll be back on for the snow, as for the rear stepping out, I drive a RWD car as fast as possible round a small track with 20 other idiots once a month so arsey cars are second nature.
I hate understeer lol.
 
gtland said:
Easier life for the viscous-coupling too. From my experience of running without a front prop for a few weeks, you`ll find the back end will step out very easily. Not what you want on wet roads, and if we get any snow this year.......!
Click to expand...

I'd have thought running without the front prop would destroy the viscous coupling, as it will be constantly trying to stop the now-free front flange from spinning? When i mean destroy it will sieze up and never allow slip again.
 
Thanks for all the comments guys and sorry for not replying sooner. I have been away for a few weeks but jusr before I went I lost a couple of teeth from my rear diffso had to replace that!!!

And NO, that hasnt stopped the problem.

And even though my car is an everyday car I still go off-road in it. I will look into taking the prop off and running it to see what happens. It wouldnt need a couple of days just a straight road to get up to 40mph. If the vibration stopped I would know it was the prop!!
 
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