02gtpmidnight

I am having an issue with my M62, have been unable to figure it out. Its been making noise, high pitched coming from the right side of the s/c right before the case bends upwards. Figured it was the needle bearings. Swapped casings with my buddies old one with new needle bearings and its still making the same noise. The inside of the original case is scratched bad and there is no play in the rotor gears or bearings. Not sure what else to do or where to seek advice. No one locally knows anything about these cars. Any input or directions toward a solution would be greatly appreciated.