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Old 01-27-2019, 05:41 PM   #1 (permalink)
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Sterling pattern check

I'm wrapping up a sterling build using one of the factory e-lockers and a 5.38 10.25 gear set in an 09 housing. Just incase anybody buying a housing isnt aware, 08-10 housings use a different inner pinion bearing than 05-07 and will require a thick shim for the race, even when using a 10.25 install kit. This shim can be purchased from revolution, nitro or yukon. This is where I ended up battling it for a few hours. Backlash is .011
https://imgur.com/a/nCrQq5c
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Old 01-27-2019, 06:40 PM   #2 (permalink)
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I am not a gear expert as I have only setup a few gear sets, but it looks to me like you need to move the ring gear towards the pinion a little bit. This should help tighten up your backlash a bit and move the contact on the coast side more towards the center. The drive side looks decent to me, so hopefully the aforementioned adjustment won't screw it up.
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Old 01-27-2019, 10:10 PM   #3 (permalink)
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Quote:
Originally Posted by wellstig1 View Post
Just incase anybody buying a housing isnt aware, 08-10 housings use a different inner pinion bearing than 05-07 and will require a thick shim for the race, even when using a 10.25 install kit.

Went through this a couple years ago, trying to remember the thickness of that shim ?
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Old 01-28-2019, 07:00 AM   #4 (permalink)
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Went through this a couple years ago, trying to remember the thickness of that shim ?
I think it is .080-.090
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Old 01-28-2019, 12:33 PM   #5 (permalink)
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Originally Posted by '84 Bronco II View Post
I am not a gear expert as I have only setup a few gear sets, but it looks to me like you need to move the ring gear towards the pinion a little bit. This should help tighten up your backlash a bit and move the contact on the coast side more towards the center. The drive side looks decent to me, so hopefully the aforementioned adjustment won't screw it up.
Tightening up the backlash is not really an option since .011 is already pretty tight for the sterling specs I have come across. I've found that .008- .015 is acceptable, but .012-.015 is supposed to be ideal.
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Old 01-29-2019, 05:42 AM   #6 (permalink)
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Those numbers seem really loose to me.

From some quick research it seems "2 cut" gear sets should be .008-.012" backlash, and "5 cut" gear sets should be .006-.010". Either way, I think .011 is a bit loose and I personally would try to get it on the tighter end of the range for a crawler/trail rig.

Yukon Gear Specs:
https://www.yukongear.com/downloads/...structions.pdf

Ford Racing Specs:
https://static.summitracing.com/glob...And-Pinion.pdf

And a couple of other hits from Google:
https://www.drivetrainshop.com/Ford_10_25_10_5_s/97.htm
https://www.crawlpedia.com/ring_pinion_setup.htm

I don't know what gear manufacturer you are using, but I would go by their specs if they have published any.
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Old 01-29-2019, 07:43 AM   #7 (permalink)
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When I am running a pattern, I like to rotate the carrier via a wrench on a ring gear bolt. This yields a better pattern IMO.

It's a tad shallow to me. I'd add 3 thou and recheck. Going deeper will also tighten the backlash a little bit.
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Old 02-01-2019, 03:55 PM   #8 (permalink)
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It is weird that there are so many varied backlash specs out there for these axles. I've been stuck at work every day and finally got a chance to get back to this today. I increased the pinion depth by .003, which also reduced the backlash to .009. Here is my new pattern which I think looks pretty good.
https://imgur.com/a/x98YiHM
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Old 02-03-2019, 10:55 AM   #9 (permalink)
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I think that looks great.

Also, I’d run on tighter backlash too.
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