M210 oil failure w/ increased pinion angle?

[scoobycarolanNC]

I have a Mojave with the M210 rear. I've developed a high pitched while around 65mph and I think the pinion bearing is failing. I'm running 85/140 non-synth Lucas diff oil. Should I switch back to the stock oil? Has anyone else had issues once their pinion angle changes with oiling?

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[CrazyCooter]

Toss the Lucas because it foams horribly!

Unless you tilted your pinion up 45°, doubt oil starvation is a factor.

 

[WILDHOBO]

I agree that oil starvation is likely not the problem, but let’s take oil out of the equation for a second. What’s your lift in the rear? Do you have pictures of your driveshaft connection to the pinion? Are you running a carrier bearing spacer? Do you have adjustable rear control arms? I’ve been through this with mine and corrected it with a combination of a CB spacer and 1/4” adjustments on the control arms to align the pinion with the driveshaft. It’s now close to zero degrees.

 

[Charles 236]

Pinion angle is not really a factor in getting oil to the pinion bearing. As the ring gear rotates, it carries lubricant up and slings it forward to provide lubrication to the pinion bearings. But I would stay with the factory recommended lubricant (viscosity and type) unless I had aftermarket gears installed, in that case I would use the lubricant recommend by the gear manufacturer. As for changing lubricant to get rid of a whine, I have never had good results trying that. But if it is a little bit low, adding lubricant to the bottom of the fill plug MAY help, but it is not guaranteed to silence a whine.

 

[scoobycarolanNC]

well I dumped my diffs and there were no huge metal shavings and the oil still looked kinda good as it was only 6000 miles old. Im starring to think it's not the diff at all. maybe a wheel bearing or something?

 

[ShadowsPapa]

There's been at least one person who has had trouble changing to a "different lube" in the differential. There are a couple I would absolutely not use after reading wear-resistance testing and other tests.
For the differentials, I'd personally stick with the stock fluid. I know there are other good ones out there but rather than get into the "which is best" thing........... I've just gotten concerned after seeing a couple of issues pop up.

Pinion angle is not really a factor in getting oil to the pinion bearing. As the ring gear rotates, it carries lubricant up and slings it forward to provide lubrication to the pinion bearings. But I would stay with the factory recommended lubricant (viscosity and type) unless I had aftermarket gears installed, in that case I would use the lubricant recommend by the gear manufacturer. As for changing lubricant to get rid of a whine, I have never had good results trying that. But if it is a little bit low, adding lubricant to the bottom of the fill plug MAY help, but it is not guaranteed to silence a whine.

This - plus at least some housings have cast-in channels that literally drop the lube "at the pinion bearing" area. That's why you can't swap some around like a few do in other vehicles.

Hypoid gears take a big beating just because of what they are - extreme pressures and the wiping action demand a good fluid.

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