odd vibration

[100SRV]

Hi,
my 100" Bowler has developed an odd vibration most noticeable between 45 and 55mph. The facts are as below:

Tyres are 235/85 R16 Kumho KL71 run at 30PSI on 7" wide rims with 1" extra offset.

Wheel bearings are all snug
No play in driveshaft hooke joints
transfer box input flanges and differential input flanges not loose

The vibration has not happened before and I haven't done anything to the car recently except use it and check the wheel bearings to trace the cause...

Ideas please!

[ruaricoles]

Are you sure it's not a simple wheel balance issue? Has a weight fallen off? Or if it's been sitting unused for a while, have the tyres gone out of round?

Ruari

[100SRV]

Hi,
not been sitting at all (car is used at least once a week and is currently being used for a 45 mile commute). I think I will get the tyres balanced as I haven't bothered to do so in the past. Oddly I swapped the tyres front to rear and the vibration appeared to remain at the rear.

100SRV

[budrover]

swivel pre-load may need re-shimming...does the steering wheel start to go shakey?

[100SRV]

Hi,
steering wheel is good and steady, oddly the vibration appears to be from the rear.

[4x4disco]

Landrover UJ’s can fail yet appear to be sound when checked, I had one complexly shot yet passed the ‘wiggle test’.

The steering damper hides all sorts of issues.

Get the car on a wheel free lift

[budrover]

rear diff on way out ?

[100SRV]

I did wonder that so I checked the pinion bearing and that seemed OK.

I think that first step will be to get all the wheels balanced and see what happens, if no improvement I will pull the differential out and see what kind of state that is in.

100SRV