well i got my diff welded yesterday and drove on the freeway for about 2hrs straight after and then all of a sudden within 2 mins it went from silent to a fnk loud whineing grinding noise i pulled ofer checked it had oit yep it did i decided to change oil on the side of the m1 noise was still there i have been told by 1 person its my

-wheel bearings from pressure from the locker

another person its my gear box cos it only does it from 60km/h on and only in 3rd and 4th gears (4 speed box)

and another pesoon it is my pinnion wheel

please if u can help doo.