Driveline noise help

[Nathan King]

Your noise kind of sounds like a transfer case output bearing or pinion bearing. Does it happen when your going downhill at highway speeds and let off the gas?

I have a weird noise exactly as you describe. It happens when I back off the accelerator while going highway speeds. And if I bounce a little because of a bridge or uneven roads, I can hear it then too. Can you give me some more info on the two bearings you mentioned?

 

[leonard_nemoy]

I have a weird noise exactly as you describe. It happens when I back off the accelerator while going highway speeds. And if I bounce a little because of a bridge or uneven roads, I can hear it then too. Can you give me some more info on the two bearings you mentioned?

All I know is my truck does the same thing. It has been doing it for awhile and my Toyota tech told me it was my front pinion bearing. He also said the transfer case output bearings make the same noise. I was told not to fix it until the noise got worse so I have been driving it for a few years now with no issues.

 

[Nathan King]

All I know is my truck does the same thing. It has been doing it for awhile and my Toyota tech told me it was my front pinion bearing. He also said the transfer case output bearings make the same noise. I was told not to fix it until the noise got worse so I have been driving it for a few years now with no issues.

So what will happen when it finally goes?

 

[leonard_nemoy]

I figure it will get noticeably louder and I will get it fixed before it fails catastrophically. If it does fail when I am traveling I will just pull the driveshaft and lock the center diff to get home

 

[LandLocked93]

Just pump your yokes full of grease till the transfer case begins to move rearward - or forward depending on the shaft. Odds are the noise will go away.
*this is recommended by pretty much no one. But it'll shut it up for a few miles.

But seriously, confirm the front shaft is out of phase. The rear in phase. If the noise is in the rear, and the rear is in phase, try it in the other 'in-phase' setting - 180 opposite. Same with the front.

I've found this to be far more effective in getting rid of the sound.

 

[calen]

Your noise kind of sounds like a transfer case output bearing or pinion bearing. Does it happen when your going downhill at highway speeds and let off the gas?

was reading through this thread and found this, which is something im experiencing. its very mild and could easily be mistaken for road condition(patch of rough), but ive determined its not. my tans mount is 40 years old and has rust cleaving between the rubber and metal parts, i assume, pushing the trans higher then normal. Im hoping it s that and not a output or pinion bearing , but Id like to hear more about that, and how to determine if it is infact that.

 

[Squash]

Especially pull the rear ds slip yoke zerk and either clean the inside with brake clean and drive around before regressing. Otherwise remove and clean the old grease out.
Your slip yokes need to move in and out as the body shifts up and down. Clean out the junk.

 

[calen]

Especially pull the rear ds slip yoke zerk and either clean the inside with brake clean and drive around before regressing. Otherwise remove and clean the old grease out.
Your slip yokes need to move in and out as the body shifts up and down. Clean out the junk.

interesting you say that as my slip yoke felt very play'y the other day adn so i pumped some grease in adn it got nice and tight, but maybe needs a more intimate clean out.

 

[SpenserAK]

interesting you say that as my slip yoke felt very play'y the other day adn so i pumped some grease in adn it got nice and tight, but maybe needs a more intimate clean out.

Pumping into the cavity just fills the space in which the shaft moves - which you don't want - which is why you should remove the shaft, clean & regrease the splines themselves.

 

[calen]

Pumping into the cavity just fills the space in which the shaft moves - which you don't want - which is why you should remove the shaft, clean & regrease the splines themselves.

yeah, gonna do that, get er fresh

 

[leonard_nemoy]

was reading through this thread and found this, which is something im experiencing. its very mild and could easily be mistaken for road condition(patch of rough), but ive determined its not. my tans mount is 40 years old and has rust cleaving between the rubber and metal parts, i assume, pushing the trans higher then normal. Im hoping it s that and not a output or pinion bearing , but Id like to hear more about that, and how to determine if it is infact that.

Well being 40 years old would make your truck a 1983 which would not be an 80 series.

But typically if you suspect the noise / vibration to be coming from the front pinion bearing or front transfercase bearing than you would pull the front drive shaft and drive the vehicle without it. If the noise goes away than you know it's either something in the front end or the front t-case output bearing.

But it would probably be best if you post up your situation in the proper forum for better advice.

 

[calen]

Well being 40 years old would make your truck a 1983 which would not be an 80 series.

But typically if you suspect the noise / vibration to be coming from the front pinion bearing or front transfercase bearing than you would pull the front drive shaft and drive the vehicle without it. If the noise goes away than you know it's either something in the front end or the front t-case output bearing.

But it would probably be best if you post up your situation in the proper forum for better advice.

lol, very astute of you. not having an 80 series does not exclude me from asking to "hear more" about driveline noise caused by "letting off the gas going down hill on the highway" 83 or 95, 40 or 80, driveline noise symptoms are likely caused by the same thing and not exclusive to a year or series. at least at this level of vagueness. and no at no point did i suspect it of being a front pinion or transfer case.