Have a parts truck with a 10.25 semis float Sterling. Could I use the ring and pinion on my other truck to change out the ratio and install a full floating 10.25?
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You should check the codes to determine which generation you have, as the pinion lengths and other specifications can vary.
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One truck is from 1989, and the other is from 1990. One of them is missing the tag.
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Housing and tubes will bear codes stamped on them. Locate these and check the axle standards.
Shimming and verifying that the teeth mesh appropriately by examining the patterns are necessary for changing pinions, which is an exact science.
There is not even.25" of wiggle room, if there were, you would probably ruin the differential and the teeth as well.
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I understand. I have done plenty of ratio changes throughout my career. I just have not been able to determine if the 10.25s have the same ring and pinion for both semi-float and full-float configurations.
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Some of the semi floats had a differing pinion length, 3.25” vs 3.5” on the full. Even the ring gear on certain semi-floats, I believe, varied in size.
Finding the codes should provide the precise specifications for the build date of that particular axle.
It might be best to just start over with a rebuild kit that includes the correct pinion, gear, seals, and shims.
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The 10.25 axles from 1985 to 1992 have a short pinion yoke, while those from 1993 to 1997 feature a long pinion yoke. Regarding semi-float configurations, they typically came in light GVW F-250s under 7,200 lbs.