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®.
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.
Sure
My Old hiace van going on ascent moving too slowly som body tell want to change pinion 8/39 it’s right or not
My diff makes a loud popping noise
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
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.
If you left the noisy gear and pinion in, then at what point or would you be concerned with other issues coming up with the differential?
You look so old now
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
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…
Always put plenty of sawdust in there.
hey ERIC, why did you paint the main gear at the end of assembly? thanks
get that shake in your hands checked out. It could be early early parkinsons? It is treatable. great video
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
What brand name differential cover do you have
What did u use to record under there with such good sound recording quality?
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
Pinon depth is spot on!!💪
Pinon gear and ring gear should not be chipped whatsoever
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
Fukn tailshaft, and the radio, backlash 0 lol carrier bearings, axle bearings
Omg I missed you dude ! Eric the car guy ! The best most complete car repair show on the net why no more fatr?
Eric! After first installation and the noise problem, if I were you, I put a good amount of graphite paste to rear end…
My Ford Falcon BF is making a shaving noise when foot taken off accelerator. Driving uphill it disappears. Please help.
How did you take video what device did you use? I'm trying to see where my vibration is coming from please help
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.
Actually the metal shavings scrached gear teeth, you need to Polish them too and even to prevent further damage to bearings too… again…
If you recorded the noise this video would've been helpful.
What book was that where it had descriptions of noises??
All the details for this will be in the video of me fucking up and now I’m fixing that.
Made in china 😂