How To Read A Differential Gear Pattern: A Beginner's Guide. ( Gear Tooth Contact Pattern )

How To Read A Differential Gear Pattern: A Beginner's Guide. ( Gear Tooth Contact Pattern )
In this video I'm going to show you how to correctly read a differential gear pattern. Reading a differential gear pattern is done by painting gear marking compound on the ring gear and rotating the pinion until the paint on the ring gear is removed by the pinion gear.
You can analyze the mark in the paint to tell you how the ring gear and the pinion gear are meshing with one another. Based on what you see in the gear pattern tells you what adjustments you need to make to the differential.
Here are links to the other 2 parts of this series:
Differential Basics:amzn.to/4agE3Ek
Full Differential Rebuild: • Complete Differential ...
Links to the tools required to rebuild a differential:
Gear Marking Compound: amzn.to/4agE3Ek
Calipers: amzn.to/48nlVr7
Dial Indicator: amzn.to/3utnAxB
Beam Torque Wrench: amzn.to/3UODXzz
Pinion Flange Holding Tool: amzn.to/3SZ2NLF
Bearing Splitter: amzn.to/4bIN1f2
Bearing/Seal Drivers: amzn.to/3uCYrAs
Hot Plate: amzn.to/3uuUu0Q
Shim Drivers: amzn.to/48j5KLp
Chemicals:
Retaining Compound: amzn.to/3SZpbEI
Thread Locker: amzn.to/48kF7pl
RTV: amzn.to/3OLwaP9
Degreaser: amzn.to/3uBzhlG
Parts used in this Ford 8.8 build:
Ford Performance 4.10 Gears: amzn.to/49EJrRk
Ford Performance Install Kit: amzn.to/3I3hR4w
Torsen T2R Differential: amzn.to/3SKyXsQ
Moser 31 spline Axles: amzn.to/3I4DYaI
Crush Sleeve Eliminator Kit: amzn.to/49AKSAr
My Amazon Store: www.amazon.com/shop/repairgeek
Help support the channel, buy using my Amazon links
As an Amazon Associate I earn from qualifying purchases and your cost is exactly the same.
I source all of my service data from the same place that professional shops do. You can as well: www.pntrac.com/t/SENKSUZKRktD...
#differential #axle #explained #gears #ford
Questions? Shoot me an email at [e-mail]
Chapters:
00:00 Intro
00:10 What is a differential gear pattern?
2:26 How to get a readable gear pattern
4:54 Parts of a ring gear tooth
7:06 Pinion depth adjustments
11:10 Backlash adjustments
15:00 Drive side vs coast side patterns
16:21 My final pattern
17:37 Outro
Disclaimer:
The information, demonstration and any content contained in this video is for informational purposes only. The user Repair Geek makes no warranty, express or implied, regarding the effectiveness or safety of the contents of this video. In no way should the contents of the video, including the tools used, be repeated or tried by anyone. Viewers should only seek the help of a trained professional located at a licensed auto repair shop for any fix, modification, alteration, or any change to their vehicle. Repair Geek shall not be liable for any injury, damage, or loss to any person or property that may result from use of the tools, equipment, or any content contained in this video. In addition, there is no way to guarantee that the video is not altered or modified or is not in the final form submitted by Repair Geek and therefore, Repair Geek does not warrant that the video is unaltered or not modified. The links on this video to products are for informational purposes only and in no way are an endorsement of the safety or effectiveness of the particular product. Viewers understand that anything contained in this video or linked to or from this video is the sole responsibility of the viewer and in no way provides an express or implied warranty as to the safety or effectiveness of any linked tool, product, or video. Therefore, viewer agrees to release, waive, and discharge Repair Geek or anyone affiliated with Repair Geek, from any and all liability, claims, demands, actions, and causes of action whatsoever arising out of or related to any loss, damage, or injury, including death, that may be sustained by the viewer, or to any property belonging to viewer, regardless of whether the loss is linked to the use of the contents of this video, or otherwise and regardless of whether such liability arises in tort, contract, strict liability, or otherwise, to the fullest extent allowed by law.

[@RepairGeek]

Links to the tools required to rebuild a differential:
Gear Marking Compound: amzn.to/4agE3Ek
Calipers: amzn.to/48nlVr7
Dial Indicator: amzn.to/3utnAxB
Beam Torque Wrench: amzn.to/3UODXzz
Pinion Flange Holding Tool: amzn.to/3SZ2NLF
Bearing Splitter: amzn.to/4bIN1f2
Bearing/Seal Drivers: amzn.to/3uCYrAs
Hot Plate: amzn.to/3uuUu0Q
Shim Drivers: amzn.to/48j5KLp
Chemicals:
Retaining Compound: amzn.to/3SZpbEI
Thread Locker: amzn.to/48kF7pl
RTV: amzn.to/3OLwaP9
Degreaser: amzn.to/3uBzhlG
Parts used in this Ford 8.8 build:
Ford Performance 4.10 Gears: amzn.to/49EJrRk
Ford Performance Install Kit: amzn.to/3I3hR4w
Torsen T2R Differential: amzn.to/3SKyXsQ
Moser 31 spline Axles: amzn.to/3I4DYaI
Crush Sleeve Eliminator Kit: amzn.to/49AKSAr
My Amazon Store: www.amazon.com/shop/repairgeek
Help support the channel, buy using my Amazon links
As an Amazon Associate I earn from qualifying purchases and your cost is exactly the same.

[@mattritz5825]

Getting ready to re-gear my Dana 80 and Dana 60 to 4.11. This is one of the best videos I've found on gear patterns. Great job, man! Thanks!

[@thinkingimpaired5663]

I appreciate your tutorial. Thanks.

[@David-yy7lb]

Awsome explanation....I have Yukon 4.56 gears in my AM 11.5 differential when I ran the pattern my tooth contact on the ring gear was dam near identical to the pattern Yukon gear recommended pattern was not to deep or to high my backlash was .006 and that's been 200k+ miles ago with no noise in the differential

[@MachRC9]

Excellent Video!! Thanks!

[@fetus2280]

Very well done mate. Thank you.

[@saltymethods2637]

This is awesome. Thank you for this information.

[@gabriela0612gh]

Thanks nice explanation I got now

[@kenrudd1073]

Awesome job my friend.

[@HumperMKB]

It’s a matter of “oh pinion” 😂

[@RepairGeek]

😂😂😂

[@michaelatkins9780]

If we were to do a paint pattern on that joke, I'm afraid we would find it slightly misaligned.

[@ikram3617]

Excellent

[@webstella]

What does it mean when you take the cover off and it looks like someone stuffed it full of steel wool? That diff ran fine up until I decided to change it out with a low mileage unit just incase. I discovered the "steel wool" inside at 160000km, cleaned it out and ran it till 330000km. Pinion ate deeply into ring gear during that first 160k. Pretty sure it came that way from factory, it was a one owner Jeep XJ Chrysler 8.25. Didn't even make noise.

[@theslimeylimey]

Why do you HAVE TO stay in the specified range for backlash? Isn't the mating pattern of the teeth far more important than a couple thou out of spec backlash?

[@edselbritting9792]

Excellent, thank you, i purchased spicer 4.88 gears to replace oem dana spicer 3.73 hopefully all goes well ...
Ps. I remember you mentioned in another video when you disassembled the mustang rear that it had timken and koyo, i purchased yukon master overhaul kits and they both (front n rear jeep diffs) have timken and koyo on the pinion, after some research it appears (i may be wrong) that koyo bought out/ merged w a portion of timken business, from what i understand although Japanese company most of the differential koyo bearings are manufactured in usa ?

[@xevvvi]

Hi could I possibly ask advice, is hammerite under body seal spray good stuff to use?

[@mikec857]

My drive side is good thanks

[@rferguson3719]

So if you have to take it apart by trial and error maybe 3-4 times to find the right pinion depth shim, won’t my inner pinion bearing get damaged from taking it on and off so many times with the hydraulic press and bearing separator?

[@RepairGeek]

Make a setup bearing. I address this in detail in the differential rebuild video.

[@rferguson3719]

@@RepairGeekyeah unfortunately either my setup bearings had enough difference in the tolerances, or a bearing race wasn’t fully seated. Cause my pattern changed from the setup bearing to final install with the bearings pressed on..

[@terryzak1742]

When I rebuilt my son's differential for his V6 Mustang, I purchase the "GXL Carrier & Pinion Bearing Puller Dana 30, 40, 60, 70, 80, Ford 10.25 Clamshell Design" bearing puller, which made removing the bearings very easy and didn't produce any damage. For installation, I finally had a good excuse to purchase a nice shop press.
Great video. Really appreciate all of the insights.

[@rickreese5794]

💯👍😎

[@michellebaxter1403]

Youre too high on crown. You should have space

[@ChrisWilliams-pu8pj]

Great video. Thank you!