Naturaly, if it is leaking, the seal may need replacing. But not always. The main thing you want to protect is the pinion bearing. Sometimes the main nut gets loose and allows the seal to leak. Ford has had this same problem all the way back to 1950 models. The whole problem is that the pinion bearing needs grease. The seal holds the grease in the differential. Of curse, I mean of course the pinion bearing is in the differential ahead of the seal. It needs grease and it needs proper tightening. And so if the leak is caused by the main differential nut being loose, tighten it good and tight with a socket that fits properly. Use a breaker bar and come down on it. You will know when it feels tight. I'd put at least 60 ft lbs on it.
If you find that the differential nut is tight, and it it leaking grease, most likely you will have to replace the seal. A new seal is pre-loaded at the factory and will take quite a bit of pressure to collapse it. I think it is somewhere in the neighborhood of 250 ft lbs to collapse it. And then go to mfg suggested spec lbs to tighten the nut.
On a 1998 Mercury Mountaineer : The automatic transmissions are ELECTRONICALLY controlled , so there is no modulator
I don't know need to find out
The 2004 Mercury Mountaineer does not have an automatic transmission fluid dipstick . I know that the 2002 and newer Ford Explorer four door versions do not have a dipstick for the automatic transmission fluid level .
I would like to know where the resistor is located on a 2001 mercury mountainneer, thank you. E-mail me at MicbossNYC@Yahoo.com My name is Mike.
On a 2002 Mercury Mountaineer : The " check gage " light comes on if the engine coolant temperature is too high , the engine oil pressure is too low , or the gas gauge is at or near empty
i would like to know that too. can some one please anwer it???
i need to know where the speed sensor is in my mercury mystique so i can replace it.
sometimes it is due to a weak battery.
The overdrive cancel switch has a fuse . It is fuse # 13 , a 5 amp fuse that also serves the flex fuel sender on your 2002 Mercury Mountaineer. That's 1 fuse I know of .
www . motorcraft service . com ( no spaces ) Click on owner guides , select year and model
I would like to answer that but I don't know what a "moniford" is.
High pressure line gets very hot.