Posted in Cars Community

What’s That Noise in My Differential?

   April 25, 2021  31 Comments on What’s That Noise in My Differential?

This video chronicles what I went through to diagnose a whining noise coming from the 10 bolt (8.5” 30 spline) differential of my 1990 C1500 truck (GMT400/OBS). The noise has been there ever since I installed a new carrier and gears last year.

I cover checking backlash, measuring pinion depth, bearing inspection, gear tooth patterns, and fluid inspection.

I hope you find this information useful!

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Links

Summit Racing: https://www.summitracing.com

More info on noise diagnosis: https://www.ericthecarguy.com/diagnosing-noises-in-your-car/

Diagnosing Ring and Pinion Issues: https://www.onallcylinders.com/2014/03/21/gear-doctor-quick-guide-diagnosing-common-ring-pinion-issues/

Tools

Pinion Depth Measuring Tool: https://www.raceplumbing.net/TD-Machine-11001-Pinion-Depth-Gauge-Deluxe-Dial-Indicator-Fixtures-GM-Dana-Ford-Mopar-Kit_p_84187.html

Dial Indicator Set (Checking Backlash): https://www.jbtoolsales.com/central-tools-3d102-dial-indicator-set-with-on-off-magnetic-base#oid=1002_1

Bleepin Jeep Pinion Tool: https://store.bleepinjeep.com/product/yoke-wrench-tool/

Astro Pneumatic Bushing/Seal Driver Kit: https://www.jbtoolsales.com/astro-pneumatic-7824-bearing-race-and-seal-driver-set#oid=1002_1

Milwaukee 1/2” (the big one): https://milwaukeetool.com/Products/Power-Tools/Fastening/Impact-Wrenches/2863-22

1/2” Breaker Bar: https://www.jbtoolsales.com/k-tool-23081-chrome-breaker-bar-1-2-drive-24-long#oid=1002_1

Torque Wrench: http://www.rakuten.com/prod/282405511.html

Part Links

My Differential: https://www.summitracing.com/parts/aub-542022/overview/year/1990/make/chevrolet/model/c1500

My 3:73 Gear Set (Original): https://www.summitracing.com/parts/sum-741001

New Gear Set (Richmond): https://www.summitracing.com/parts/rmg-4900411

My Differential Cover: https://www.summitracing.com/parts/sme-8510300nl

Ratech Ring and Pinion Installation Kit: https://www.summitracing.com/parts/rat-3003k

Pinion Bearing Set: https://www.randysworldwide.com/product/pk-gm8-5/

Related Videos

How To Use a Pinion Depth Measuring Tool: https://youtu.be/S61Ut8tOu1o

#ETCGDadsTruck Axle/Differential Rebuild (Part 1): https://youtu.be/F439MFi6qIk

#ETCGDadsTruck Axle/Differential Rebuild (Part 2): https://youtu.be/vkSvYCqrlOI

Last Minute Prep and Problems #ETCGDadsTruck: https://youtu.be/u0mBrFVET5Q

Introduction to #ETCGDadsTruck Build (Episode 1): https://youtu.be/kCepnacqRuI

#ETCGDadsTruck 4” Rear Suspension Drop (Part 1) (Episode 3): https://youtu.be/VNnEiIoGpwE

#ETCGDadsTruck 4” Rear Suspension Drop (Part 2) (Episode 4): https://youtu.be/63SfLDsdKRs

#ETCGDadsTruck Playlist: https://www.youtube.com/watch?v=kCepnacqRuI&list=PLSzhQ6St-ov1g_GML2aVq6EN-_ShJ9G2o

The FairmontProject Playlist: https://www.youtube.com/watch?v=L22GsHQi7tU&list=PLSzhQ6St-ov2nxWVKCeU14Vt7JJ_QSZvs

**Answers to your automotive questions found here: http://www.ericthecarguy.com/faq

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Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information.  EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video.  Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result.  Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy®.

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31 thoughts on “What’s That Noise in My Differential?”

  1. Come clean, old bearings for set up….you set the pinion crush wrong and could have used the old bearings for set up. Differentials are the black art of mechanic repair world. Lots of guys with decades of experience have no idea how to do it right once and/or with consistency.

  5. Going thru a 2001 Silverado rear end right now. It is the open rear end and the smaller bevel gears both had most of the teeth breaking off the outer edge. Your video was a big help in what to look for and what to expect. Thanks

  6. I use the Yukon "super carrier shim kit" and "crush sleeve eliminator" whenever I can on gear installs. You can dial that backlash in where you want. (yes I prefer the tight end of the spec) And no more finger crossing while setting pinion preload.

  9. I have 4runner 2006 shaking at 25 mph when accelerate slowly but with strong accelerate no shake at all. Do you know what might be the problem? Thanks indeed

  10. Thank you very much for such an informing video. Nowadays, I am having the same problem with 2010 Forester XS 4EAT and very much scared of damaging the transmission. We ll see what’s up with the ring and pinion tomorrow, but in worst case scenario i guess I am gonna go with a new set of ring and pinion (even though that set is also very expensive). I still wonder if it is possible to fix it with replacing the bearing and races (if ring and pinion is fine) only. I will let you know…

  14. Replaced my diff after watching your original video and had the same noise
    The gear set is currently Richmond excel but if I end up swapping the gear set again I’m just taking it to the shop to have it done because I’ve had it with the rear end project
    Thanks for your informational videos and updates though your knowledge is definitely appreciated

  17. Great man,great display of patience and not giving up, you are blessed with a great gift and knowledge,and it is trait to share knowledge

  20. Tight is good for the track..but normal driving and pulling will burn up bearings and ring gears. Pinion bearing need to be a little tighter down

  26. I have a 2010 F150 that is making a binding sound when accelerating after turning a corner. Kind of what you get when on drive pavement with the 4wd on, but it's not. It shakes and chatters too then levels out once moving straight and all is fine – no noises. I thought it might be the rear end, but it sounds nothing like what I have seen on YT. I bought a bottle of fluid in case it's low, but now I am thinking it's something else, but what else is there? The back brakes are pretty new. Could it be a wheel bearing? Any thoughts would be appreciated.

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