g,day, yea i knew it was never cv or swivel noise, cause it made it before and after i rebuilt the swivel pin housings and fitted new cv's at the same time. i also use one shot swivel housing grease in all my landy,s instead of gear oil, anyway, i ended up trying cutting the engine a few more times, only to find it was,nt stopping the noise as i previously thought, its one of those things were you can,t quite put your finger on it, but to let everyone know i have solved the issue ,it was not one but both diff centres, ( just my luck) took it to a good mech the next town over and he found the fault straight away, so 2 recon diff centre's later at $500 each, and i,m running silent, lol. thanks to everyone for their input, it was very helpful. i,ll start a new post soon on my defender race truck project once i get some photos, i have just built a 3.9 v8 stroked to 5lt, very high lift solid cam ,roller rockers, etc etc, with a hand built custom mainfold (its good to have mates,lol thanks matty) , that will be running twin carby style toyota superchargers with a 650 dp holley mounted on each, with a hope of pumping 15psi, , so hopfully should go a bit harder than the old diesel that was in it, lol, still early stages yet though. i,ll put some pics of the donk with the pumps fitted in the next couple of days.

 

Thank you for reporting back Rick.

 

I said I would follow up...

The silver bullet was a rear pinion bearing. To make it solid, driving at speed the whine got louder until wind/engine noise covered it up. Hold the RPMs even with the speed so there was no stress and the sound went away. Transmission shifts down and the noise increases/grinds down to a stop.