Late 99 RR HSE 4.6 Auto Owned for 2 years
Around 4 Weeks ago started to imagine I was hearing a slight whine when lifting off the gas or when going downhill, fine when accelerating, braking or going uphill. After a couple of weeks got louder till was almost a screech. Only around a hundred miles or so later, Seemed to be coming from under foot/front end. Could feel a slight vibration coming from underfoot in the cab when lifting off the gas. Steering fine, no pulls of stiffness. Gearbox functioning correctly. No errors at all.
Started to dig on forums as to what would cause, firstly oil levels. Here I have to admit ignorance/stupidity. Didnt realise the transfer box had separate fill to the gearbox.
So front diff, 200 ml of oil required. Gearbox full as I would expect as had changed oil last year. Transfer box. Drained out 1 lt of oil and filled up 2.3 lt of ep90, Back diff, none required.
Problem still there. So over the past 2 weekends have removed the transfer box, replaced with a known good one. Greased and checked back and front prop shafts and universal joints. Front one seemed to be quite new with the black coating still on it. No play in any of the joints.
All back together again and noise still there Ahhhrrrrr ..
Help!
Is all I am left with Front Diff?
Can I take the front prop shaft out altogether and test by driving to see if the noise is still there?
Or will this cause damage.
Any comments or suggestions appreciated
Around 4 Weeks ago started to imagine I was hearing a slight whine when lifting off the gas or when going downhill, fine when accelerating, braking or going uphill. After a couple of weeks got louder till was almost a screech. Only around a hundred miles or so later, Seemed to be coming from under foot/front end. Could feel a slight vibration coming from underfoot in the cab when lifting off the gas. Steering fine, no pulls of stiffness. Gearbox functioning correctly. No errors at all.
Started to dig on forums as to what would cause, firstly oil levels. Here I have to admit ignorance/stupidity. Didnt realise the transfer box had separate fill to the gearbox.
So front diff, 200 ml of oil required. Gearbox full as I would expect as had changed oil last year. Transfer box. Drained out 1 lt of oil and filled up 2.3 lt of ep90, Back diff, none required.
Problem still there. So over the past 2 weekends have removed the transfer box, replaced with a known good one. Greased and checked back and front prop shafts and universal joints. Front one seemed to be quite new with the black coating still on it. No play in any of the joints.
All back together again and noise still there Ahhhrrrrr ..
Help!
Is all I am left with Front Diff?
Can I take the front prop shaft out altogether and test by driving to see if the noise is still there?
Or will this cause damage.
Any comments or suggestions appreciated
