ID: Bad pinion bearing

Indication of a bad pinion bearing, DIY method.

[Macrotechee]

Succinct, clear narration and great footage (easy to see what's going on) This video is a breath of fresh air. Thanks heaps, you're a legend.

[RussellBooth]

It is best to replace the bearings as soon as you hear the bearings become noisy as I have been unemployed for the last 5 1/2 years & I kept waiting until I scraped up enough funds then I heard the diff gears in my car start to hum at around 60 km/h (40 mph).

The diff is a Dana M80 & I spent about $200 AUD on new pinion & side bearings, also on the diff oil, I rebuilt the diff in September 2014 & it had no pinion preload on the pinion bearings, the inner bearing race got damaged so had zero newton meters of pinion bearing preload.

The diff still did have a bit of a hum at 60 km/h after I blued the gears in with Prussian blue bearing dye & set the diff lash up the same as what it was before (0.12 mm), the tooth contact pattern was good but because the gears were unevenly worn due to a bad pinion bearing, it was impossible to replicate the tooth contact pattern as if I was using brand new or good used gears.

So all I did is drove the car around for nearly the last 3 years (about 40, 000 kms or almost 25, 000 miles since the rebuild) & the gears have slowly got quieter, I know the gears went from a hum in 2014 when I went into town & went over the bridge which is arch shaped, which is where I heard most of the noise to a faint wine which I heard tonight when I drove the car.

So, the gears are polishing the high spots off themselves at different loads, so it's going to get to the the point that the diff will end up totally quiet, don't worry, I know of a mechanic who just thinks that I'll blow the diff up.

[DPeter]

look at the angle the driveshaft is fitted to the rear axle. No wonder it's eating bearings. 

[Sandbag]

Thank you for the video. Showing the drive line excess play was very helpful.

[elevenbravodotnetonyoutube]

*Tcase end was okay, Axle side was bad pinion bearing   *I changed front AND rear to 4:11  *Pinion bearing was bad, nut was not the problem, but could have been. *Diff does NOT have to point directly to tcase, angle of ujoint at tcase and axle should be equal.  If pointed at the tcase, axle angle would be different. *Its a GM 10 bolt, not a Dana... but equal to a Dana 44. *I dont do R&Ps, had a real mechanic do it for me.

Thanks for watching...

[SheepDog]

i love all the people talking about the angle of your shaft, obv. they dont know nothin about the design of it, its not like others where they require shims. 

[darianthompson]

Could it be from that angle caused by the lift kit?

[effenfish]

my pinion bearing is only noisy right now. my mechanic said that there are no replacement rears available. total rebuild of rear, including axle bearings, is about $1400

[jyrostng]

OR the pinion nut came loose, tighten the pinion nut to the pinion pre-load specs.

[mlez]

does the pinion bearing comes out from the back? the pumpkin side with the bolts?

[davidclark]

So what will be the cost of all that if you couldn't do it

[davidclark]

Well how much is that going to cost dude I thought you was going to tell me I'd really like to know I got the same s***

[kevinragsdale]

I have a truck that has some howling noise coming from the rear end, but only under load/in the throttle. I assume its this or the wheel bearings?

[AGuysGarage]

if you change the ratio to 3.73 : 1 from 3.08 : 1 you may want to change the front diff as well. Not good to have two different ratios.

[FishingHuntingAndBigfoot]

Idk what an axle would cost but you can buy a rebuild kit for under $200 and just do it yourself. If you take it to a mechanic it's going to cost around $1000. I plan on doing mine myself. The main thing is, you have to have the right tools.

[elevenbravodotnetonyoutube]

GM 10 bolt on an '82 K5 Blazer, 6.2L diesel. Thanks for watching.

[platinumgirl]

05 ford Mustang makes awful noise. told it's rack and pinion in rear differential and bad bearings in transmission. when in park and running can't hear noise, but when inside driving can hear the noise when car is put in 1st gear the noise begins and continues while driving and changing gears.

[dankraft]

What about play on the other end of the driveshaft? From the tcase end

[skaaltel]

Thanks for confirming what I suspected about my diff. $$ arrrgh

[Moosetraks]

all these people criticizing a two u joint driveshaft angle thinking its supposed to be set up like a double cardan which has three u joints. Know what you are talking about before you criticize this guy.