loud as *** hum/howl in transfer case or front axle

[lincolnlocker]

only when it is locked in 4x4 does it do it while under load or coasting.... i can lock the hubs in and leave it in 2wd and no noise. i can leave the hubs unlocked and switch it to 4wd and no noise(esof has not worked in a year) so the hubs don't lock automatically anymore... but as soon as i lock the hubs in and switch it to 4wd the howl/hum is realy loud....

just replaced both unit bearings and axle ujoints... drive shaft joints are still good... drained the tcase fluid and some small flakes came out but no chunks.... drained front diff to see if anything was loose and everything was solid but the oil was off color, looked like someone dumped silver dust in it and mixed it up.. changed the front diff oil last summer and didn't even look that bad only milky from moisture then.. so is it possible i could have a bearing wore and is howling?

what else should i check?

 

[Zmann]

guessing your ring an pinion or bearings in the area are toast

 

[Viking]

Yea get under there and grab your shaft and try and move it up and down. IF you have any pinion movement.....im sorry but your out $600.

 

[lincolnlocker]

pinion doesn't move. when i looked at all the gears in the diff they all looked even as in no obvious grooves. had my brother spin the drive shaft back and forth and the ring and pinion moved in unison with each other no slop that i could tell with the naked eye...
same with spyder and axle gears... spyders might have had just a little bit of wiggle on the cross pin but thats the only thing and not much at that...

 

[Viking]

dang, super duty's like to have howling pinions bearings

 

[lincolnlocker]

its only been like this for a couple months now... and only in 4x4 but it still drives me nuts cuz its not rite... started doing it after i got hung up trying to get my sister out of a snow drift in her minivan... reverse first's are hard on things and stupid to do but where i was at no one would have made it to me... but o well.. just wanna fix it now...

 

[lincolnlocker]

anything else to look for?

 

[GIZMO6.0]

If the front end checks out. Look closely at the ujpints in the front shaft. If ok you may need to tear into the tcase. Might have shock loaded it.

 

[nvme_63]

Sounds like a t-case to me. Lock it in 4x4. Put the truck in neutral, someone grab rear drive shaft and turn, at the same time grab the front and see how much slop you have between the two. If that make sense lol, been up for 30 something hours.


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[lincolnlocker]

If the front end checks out. Look closely at the ujpints in the front shaft. If ok you may need to tear into the tcase. Might have shock loaded it.

ujoints are all ok.

Sounds like a t-case to me. Lock it in 4x4. Put the truck in neutral, someone grab rear drive shaft and turn, at the same time grab the front and see how much slop you have between the two. If that make sense lol, been up for 30 something hours.


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Ok ill check..

Thanks fellas

 

[Zmann]

no need you already eliminated the transfer case and u joints

i can leave the hubs unlocked and switch it to 4wd and no noise

i can lock the hubs in and leave it in 2wd and no noise

 

[lincolnlocker]

Ok so I put it in 4wd and rocked the drive shafts back and forth... there's about 3/8" of rotation in the front drive shaft at the tcase when I hold the rear drive shaft to one side or the other.

 

[lincolnlocker]

Is 3/8" a lot or normal?

 

[Zmann]

lol I would have to check mine

 

[lincolnlocker]

still have no clue where this noise is coming from!! is it possible the noise is radiating from the rear end through the tcase when its locked in 4wd...

 

[Betarocker]

It wouldn't hurt to inspect rear driveline. Start at the carrier bearing, and if that checks out, try the u-joints and so on.

 

[lincolnlocker]

Ujoints in the rear shaft are just over a year old and are spicers from ford... maybe have 25k miles on them. No slop in them.. haven't checked rear pinion yet.

 

[chappy]

I know this is an old one but mine started doing this now. Didn't do it last winter so somethings changed. Just wondered what you came up with?

 

[lincolnlocker]

nothing yet! ive been told its very rare that the transfer case goes bad... sometime after i get my truck back from the motor being rebuilt, im gonna have all the bearings replaced in the front diff.

live life full throttle

 

[kadeninabnitt]

my jeep does this same crap and it is the bearings for the carrier in the hog head the jeep will make it about 6 months on a set of bearings and it will start screaming and howling i just keep replacing them untill i can yank the junk d35