In the 1993 pajero when we are gaining speed from about 40 km it starts a high pitch winding noise from the front end very loud in the car its not wheel bearings kinda sounds like the gearbox so i dunno what it could be can u help at all

get all 4 wheels off the ground,start vehicle,put in drive,with a large bar stop each wheel,itcan tell you which wheel has the issue.I've replaced all 4 hub and bearings,11/2 trs later the rear went again.... buy the best possible..hope that helps !

check the altenator berrings, also check condition of air pump it may be going out,don;t forget the water pump berrings

CV JOINTS?

that depends on if you think the noise is coming from the motor, or the actual road noise that comes with driving , its probably the same at both speeds but sine you have less air and outside noise,, you hear it more at lower speeds. does it make the same noise when started but not moving? if you answer that yes, then its something else besides road noise, if it is no, then get your front end checked, it could be anything from a bad alignment to a bad wheel bearing, or bad brake ,

Sounds like a constricted IAC Idle air control valve passsage. Fairly simple to fix. Remove air filter trunking all the way to the throttle body to allow access. The IAC allows air passed the throttle when closed at idle. Just on the inside of the throttle body in front of the throttle flap there is an opening in the throttle wall. This is the air inlet to the IAC; there is an outlet similar on the other side of the throttle. Use carb cleaner and cloth to shift the grime from this tubing and get it like new. Hold the throttle flap open to get at both ends of the IAC tubing. The IAC can be detached and cleaned to a shine. Reinstall the IAC and replace all air pipe ducting. Leave for about 20 minutes to allow any cleaner residue to dry out. When you restart you might experience a bit of uneven running but this will disappear very quickly as the last of the cleaner dries out

Electric cooling fan bearing failed and the cooling fan needs to be replaced. Start with inspecting the cooling fan behind the radiator and determine if that is where the noise is coming from. Replace any worn or damaged parts.
Thank you for using fixya and be safe.

this sounds odd but mine did this when i replaced the wipers. it seems the design of the wiper frame was making a whistle at higher speeds. the freestar wipers are exposed on the window cowl and not hidden so they endure the winds at high speed. it is worth a shot.

Hi,sounds like a alternator belt slipping try spraying some W D 40 on it if noise gos change the belt.
hope this helps you
George

sounds like you need your transfer case looked at and repaired.....that the only thing i can think of...hope it helps :)

Maybe yall should check the power steering pump.Hubby said it could be that. Repost and let us know if and when yall get it fixed!