Please Help! Humming Noise?

Mlopez · #1 02-25-2020, 09:41 AM

Hello my name is MArcos and happy to be a part of this Forum. I own several Ford Rangers and one of them im having an issue I cant seem to figure out.

I have a 1991 Ford Ranger extended cab 4x4 with 4.0 liter engine. Recently my truck started making a weird humming noise between 30mph and 50mph. Cant really tell where its coming from, its not real loud but its definitely making a noise. I assumed it was my wheel bearings so I went ahead and replace them along with new brakes and rotors. Still making the noise, noticed some play in my u-joints so I replaced all 6 of them. Still making the noise. Doesn't make the noise when parked or idling. I hear the noise while in gear or in neutral, with gas pedal pressed or coasting. Not sure what else to check? Rear Diff maybe? ring and pinion? torque converter? front axle u-joints? Any help would be greatly appreciated?

djfllmn · #2 02-25-2020, 10:11 AM

does it still whine if you kick it into neutral?

Mlopez · #3 02-25-2020, 10:34 AM

Quote:

Originally Posted by djfllmn

does it still whine if you kick it into neutral?

sure does?

checked my carrier bearing when the drive shaft was off and seemed to be ok. Im gonna try rotating my tires this weekend and see if that makes any diffeence

Mlopez · #4 02-26-2020, 08:31 AM

any other suggestions what this might be?

Mlopez · #5 03-02-2020, 08:20 AM

dang almost 100 views on this thread and only 1 reply? surely someone has some advice to offer?

barneycat11 · #6 03-02-2020, 01:11 PM

Check your rear wheel bearings and differential fluid also check pinion bearing.

TheBigAndy · #7 03-04-2020, 09:33 PM

I’ve got the exact same problem on a 1996 2.3 2wd ranger, except, not all the time, but randomly, and haven’t figured it out.
Thinking either rear diff, or tranny.

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Automatic or manual?

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Mlopez · #8 03-05-2020, 01:33 PM

Quote:

Originally Posted by barneycat11

Check your rear wheel bearings and differential fluid also check pinion bearing.

no rear wheel bearings on this truck that im aware of. Gonna check the fluid this weekend. pinon bearing is the only other thing that I can think of although I would think it would make the noise all the time if it was the bearing?

barneycat11 · #9 03-06-2020, 06:01 AM

Their internal on the axle shaft behind the brake backing plate.

wpginterceptor · #10 03-06-2020, 12:03 PM

jack it up safely, put in the air and put in gear.. then find the noise