12 Bolt Rear End Noise Diagnosis and Repair
This 1972 Chevy Nova with LS power has a really bad noise coming from its 12 bolt rear end. In this episode I take you through the process of diagnosing and repairing this noise. I also cover backlash, pinion bearing preload, bearing installation, setting pinion depth, reading gear tooth patterns, installing new gears, and other tips and tricks to make sure that the differential in your vehicle stays quiet and strong.
I hope you find this information useful!
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Links
Sorry I don’t have direct links to the parts used in the video as they were brought to me along with the car. These are the places where I get most of my differential parts and accessories.
Summit Racing: https://www.summitracing.com
Randy’s Worldwide: https://www.randysworldwide.com
Info on Identifying 12 Bolt Differentials: https://www.onedirt.com/tech/drivetrain/12-bolt-rearend-guide/
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
Shim Installation Tool: https://www.summitracing.com/parts/yga-56077?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-yukon-gear-axle&gclid=CJ6Dj-DSxc0CFQgaaQodKbgFjA
Milwaukee 1/2” (the big one): https://milwaukeetool.com/Products/Power-Tools/Fastening/Impact-Wrenches/2863-22
Milwaukee Angle Die Grinder: https://milwaukeetool.com/Products/Power-Tools/Metalworking/Grinders/2485-22
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
Inch Pound Torque Wrench: https://www.jbtoolsales.com/precision-instruments-d2f150hm-torque-wrench-dial-with-memory-needle-3-8-dr-150-in-lb#oid=1002_1
CRC Brake Cleaner (5 Gallon): https://www.amazon.com/gp/product/B000M8PYRY/ref=ppx_yo_dt_b_search_asin_title
Brake Cleaner Sprayer: https://www.jbtoolsales.com/titan-tools-tekz-19419-spot-spray-non-aerosol-sprayer#oid=1002_1
CRC Rags: Sorry, I believe these are discontinued
Sunex Press: https://www.jbtoolsales.com/sunex-tools-5720-manual-shop-press-20-ton#oid=1002_1
Related Videos
What’s That Noise in My Differential?: https://youtu.be/lv94-bItw-I
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
How To Clean, Prep, and Paint a Differential #FairmontProject: https://www.youtube.com/watch?v=il8nDlCepyc
Ford 8.8″ Differential Complete Tear Down #FairmontProject: https://www.youtube.com/watch?v=Plvg0NTLraA
Ford 8.8 Assembly & Set Up (Part 1) #FairmontProject: https://www.youtube.com/watch?v=5fARhE7v5Bg
Ford 8.8 Assembly & Set Up (Part 2) #FairmontProject: https://www.youtube.com/watch?v=npUBF9Wj1Iw
Ford 8.8 Final Assembly #FairmontProject: https://www.youtube.com/watch?v=P3Pb_eNLkQc
Bending and Flaring the Differential Brake Lines #FairmontProject: https://www.youtube.com/watch?v=AHdFgGGCEcw
Installing the New Differential in the #FairmontProject: https://www.youtube.com/watch?v=3E9BA6YlhjU
#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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Stay Dirty
ETCG
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®.
