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#4120892 - 09/14/21 10:17 PM Rear end noise - pinion bearing? (Video)
GMUE03 Offline
Rookie

Registered: 12/23/18
Posts: 70
Loc: Florida
Ever since I bought the car at 82k miles there has only been a noise when cruising from 40-60 MPH. It only occurs when I’m on the throttle (chalked it up to a noisy fuel pump for the longest time), but recently I’ve been getting concerned because I don’t cause further damage to my rear end. From my research I’ve narrowed it down to either an axel bearing or a pinion bearing. The pinion bearing looks like a simple job to do so I’m hoping it’s that.

Here’s a video of the noise https://youtube.com/shorts/6_0c_YGrxeM?feature=share
Interested to hear what you guys think.


Edited by GMUE03 (09/14/21 10:21 PM)
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2003 Mercury Grand Marquis LS Ultimate Edition- 100k


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#4120918 - 09/15/21 07:56 AM Re: Rear end noise - pinion bearing? (Video) [Re: GMUE03]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2561
Loc: Cleveland, OH
Wheel bearing is a lot more likely, but it could even be a bad tire. (I don't hear good, so take that for what it's worth.) Pinion bearing isn't an easy repair; you have to re-set the gear mesh which is a pretty technical operation.

Best way to pinpoint it is to put the car up on stands (or a lift if you have access to one) and let it idle in gear. Poke around with a stethoscope til you find it.
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1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 56K
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#4120924 - 09/15/21 08:12 AM Re: Rear end noise - pinion bearing? (Video) [Re: GMUE03]
2011LX Offline
Over the Hill

Registered: 08/31/13
Posts: 1409
Loc: SE WI
The relative dimensions of the pinion to the axle housing centerline are independent of the bearings.

That said, the shim pack is reused and "resetting the gear mesh" is unnecessary. Only need to install a new seal, new crush sleeve, and set bearing preload.

Only need to reset when the gear set, differential, or axle housing is changed.
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2011 Crown Victoria LX - purchased @ 37k miles
currently @ 100k miles
Dark Toreador Red Metallic exterior
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#4121140 - 09/16/21 11:31 PM Re: Rear end noise - pinion bearing? (Video) [Re: GMUE03]
fordoldfart Offline
Climber

Registered: 10/27/09
Posts: 770
Loc: kansas
I had a whine on coast it wasn’t bad. Just for the heck of it I changed the oil in the rear end. Never heard the whine again.

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#4121182 - 09/17/21 11:05 AM Re: Rear end noise - pinion bearing? (Video) [Re: GMUE03]
Lance01 Offline
Climber

Registered: 04/02/18
Posts: 520
Loc: Pa
I just got a 2004 MGM with 100k. About 2 weeks ago I finally got around to changing the rear differential fluid and I was surprised the oil was near dark brown to near black in color. It even left a stain on the differential cover.

Changed out the fluid with fresh new Amsoil severe gear 75w140.


In your case go to Walmart and buy some Supertech gear oil and change out the fluid and see what it does. If that doesn't work then knock out those bearings (easy fix just need to rent a tool from Autozone) but if it's anything else in the differential I would take that to a shop that specializes in transmissions or racing.

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#4121804 - 09/21/21 11:01 AM Re: Rear end noise - pinion bearing? (Video) [Re: GMUE03]
GMUE03 Offline
Rookie

Registered: 12/23/18
Posts: 70
Loc: Florida
I serviced the diff fluid about 10k miles ago while the noise was still going on, didn't fix it. I should note that there was minimal metal particles on the fill plug when I pulled it off.
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2003 Mercury Grand Marquis LS Ultimate Edition- 100k


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#4121838 - 09/21/21 02:15 PM Re: Rear end noise - pinion bearing? (Video) [Re: GMUE03]
professorP7B Offline

Member

Registered: 04/02/20
Posts: 331
Loc: Rhode Island
My '11 Vic had your exact symptoms to a "T," ended up being the pinion bearing (as expected.)

Gave me a good excuse to swap in a lower ratio.
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Teacher/Technician. First-time Ford owner. ASE-certified Advanced Level Specialist.
Current vehicles:
2011 Crown Vic P7B (SAP, former campus police vehicle)
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#4121920 - 09/21/21 09:50 PM Re: Rear end noise - pinion bearing? (Video) [Re: GMUE03]
GMUE03 Offline
Rookie

Registered: 12/23/18
Posts: 70
Loc: Florida
Usually when people tell me it was their pinion bearing they always follow it up by “I swapped in a (enter bigger rear gear ratio here) and that fixed the problem” lol, nothing wrong with this, but my question is, if the pinion bearing is bad, is it too late? Or can I just get away with replacing the pinion bearing itself?
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2003 Mercury Grand Marquis LS Ultimate Edition- 100k


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#4121950 - 09/22/21 08:12 AM Re: Rear end noise - pinion bearing? (Video) [Re: GMUE03]
2011LX Offline
Over the Hill

Registered: 08/31/13
Posts: 1409
Loc: SE WI
You can replace just the bearings.
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2011 Crown Victoria LX - purchased @ 37k miles
currently @ 100k miles
Dark Toreador Red Metallic exterior
Medium Light Stone interior

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