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Old May 6, 2025 | 06:41 PM
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Gear Pattern Opinion

I rebuilt the 10.25 Sterling axle in my 1995 F350. Looking for feedback if the gear pattern is good.

Specs:
Sterling 10.25
Original 4.10 gears re-used
All new bearings and races
new electronic locking Ford Diff
Measured runout of ring gear 0.002 inches
Backlash measured in 6 places: 0.01" to 0.013"
Pinion rotational resistance 22lb-in
Pictures are taken with preload applied to carrier bearings. Pictures show multiple locations on ring gear.










 
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Old May 7, 2025 | 08:55 AM
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Looks to low on the ring gear to me
 
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Old May 7, 2025 | 09:30 AM
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From the charts I looked at, shift carrier towards the ring gear side ~.001"?
 
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Old May 8, 2025 | 08:00 AM
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Pattern with carrier shifted towards ring gear .002". Backlash is at the edge of 0.015".



 
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Old May 8, 2025 | 08:02 AM
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Backlash at .017", outside of spec.



 
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Old May 8, 2025 | 08:10 AM
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Using the used gear set original to the housing, what would be suggest next steps?

Some reading suggests if pattern is centered between face and flank its good.
 
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Old May 8, 2025 | 06:38 PM
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If you are out of spec, then it's out of spec. Your call.

You could try it and see how it runs. Then drop the cover in about 50 or 100 miles and see how the gears look AND the fluid.

If it were me, I'd try it. But be ready to buy new gears or a whole used axle assembly.
 
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Old May 9, 2025 | 02:22 PM
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I replaced the carrier in my 10.25 recently (within a year ago) and I read somewhere along the way, that when it comes to setting up used gears, it more important to try and put them back where you found them, more than within ideal spec of absolutely middle where you'd want to setup new gears. I dunno how actual the info was, but had I known that before taking the old gears out, I would have read the pattern first haha. That said, when I put it back together, there was no noise and I read that if you get them setup without noise, then you did your job well.
 
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