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#26 |
Senior Member
![]() Join Date: Nov 2013
Location: East Tennessee
Posts: 2,151
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Re: Check my gear pattern :)
.009 will work just fine.....as good as your pattern is....it should run quietly...not every one agrees but the guy who taught me....always put the vehicle on jack stands and ran it for about 30 minutes to warm it up...then let it cool slowly...and you're good to go....did you replace the carrier bearings?
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1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer ............. ![]() |
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#27 | |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
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#28 |
Registered User
Join Date: Feb 2015
Location: TX Hill Country
Posts: 150
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Re: Check my gear pattern :)
I am of the opinion let it run. Looks really good and the pinion shim thickness is closer to original and what I ran and your backlash at .009 is within tolerance and what I ended up with as well. Mine only has a few miles on it but works and sounds perfect. Good luck to you as I think you are very good.
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#29 | |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
Quote:
Mines gonna get alot of miles on it running jetskis from California to Arizona and back. Last edited by superhondaz50; 01-05-2018 at 10:40 PM. |
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#30 |
Account Suspended
![]() Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,873
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Re: Check my gear pattern :)
Post 9 is your best pattern, although your first pattern was good too for a performance application and most gear sets are lapped for a toe pattern. There is a corvette guy that does a lot of rear ends, I will find. A pic of his patterns and Post back.
The current pattern will put way too much load on the heal of the teeth and if you have horsepower will break a tooth. The pattern on the drive side should be slightly towards the toe since under load the pattern will shift to the center. Don’t worry about the coast pattern as far as placement unless way off. If you can you should be putting a load on the ring gear and turning the pinion with a socket. You can rig up a couple bolts and a hard wood block to load the ring gear. |
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#31 |
Account Suspended
![]() Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,873
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Re: Check my gear pattern :)
Here is a pattern chart which should be helpful, note competition pattern is towards toe of gears.
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#32 | |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
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#33 |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
I'm thinking if I can pull the backlash in to around .008 some how I'd get a better pattern. The coast and drive pattern are in the same spot, seems to be centered top and bottom, backlash should pull it center a bit. BTW this is a hobbed gear.
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#34 | |
Account Suspended
![]() Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,873
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Re: Check my gear pattern :)
Quote:
I usually turn my pinion with a slow speed 1/2” drill while loading the ring gear with a block of wood....cordless dewalt or other good drills on low speed will work too. |
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#35 |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
Ok, ya, looks like I'm way off compared to that pic. I think I'm just gonna have to give in and take it to a shop, I can't have this thing let go when I'm in the middle of the desert when it's 120* outside haha, I can say I tried.
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#36 |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
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#37 |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
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#38 |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
Post #9 shows .039 with .007 backlash
I can go to .037 too and take a pic for you guys if needed. |
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#39 |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
For future reference and searches, I showed a rear end builder my gear patterns (.039, .037, .035, .0335/.034, .032) and he said the .0335/.034 shim and .008 backlash were on the money for my Richmond set, so I'll be rocking it as shown below. It looks good to me also but what the heck do I know.
Ok, here it is .008 backlash with with a shim on .0335/.034. ![]() ![]() |
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#40 |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
Well, my wife helped me button up the rear this past weekend. Set the preload around 19-20-inlb, new bearings, Moser yoke, and a Spartan locker. Hopefully it'll work, I'll know in a month or so once I finish assembling the truck. If not the local guy is gonna charge me $1200 to fix it -_- I'll post up here again to let y'all know.
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#41 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,264
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Re: Check my gear pattern :)
Better hope you did it right then.
![]() Man, I need to get in the differential business.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#42 |
Registered User
Join Date: Mar 2007
Location: Behind the Taco Bell dumpster
Posts: 296
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Re: Check my gear pattern :)
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#43 |
Account Suspended
![]() Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,873
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Re: Check my gear pattern :)
I'm sure it will be fine...none of the patterns you had were far off from ideal.
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#44 |
Registered User
Join Date: Jun 2015
Location: Phoenix Az
Posts: 211
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Re: Check my gear pattern :)
That backlash looks good to me. I have a 12 bolt 3.73 ring and pinion with a lock rite posi.
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Brian Ritter |
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