What Gear Oil in Rear Axle 2003 F250
Sterling 10.25 in Differential Service
How to Supervene upon the Differential Fluid in a Sterling/Ford 10.25 Rear Axle
Applicable Models:
1985 - 1998 Ford F-250, F-350
Applicable Differential(southward):
Ford Motor Visitor Sterling 10.25 inch rear differential
The Sterling 10.25 rear differential is a heavy duty, full floating rear axle produced by Ford Motor Company and used in the Ford F-Serial (F-250/F-350). The name is derived from the fact that the differential features a x.25 inch band gear and is manufactured at Ford's Sterling Axle Establish in Sterling, Michigan. The x.25 inch was replaced by an updated version of the axle associates for the 1999 model year, which features a 10.l inch ring gear.
Sterling 10.25 in Differential Specs
| Manufacturer: | Ford Motor Company | |
| Production Plant: | Sterling Axle Plant, Sterling, Michigan | |
| Applications: | 1st Gen Sterling 10.25 | 1985 - 1992 MY Ford F-250, F-350 |
| second Gen Sterling 10.25 | 1993 - 1997 MY Ford F-250, F-350 | |
| Type: | Total floating rear differential (semi float diversity used in light duty vehicles, all Super Duty and standard F-250/F-350 models are total floating) | |
| Ring Gear Diameter: | 10.25" | |
| Pinion Shaft Spline: | 31 spline | |
| Axle Tube Bore: | three.50" | |
| Axle Shaft Bore: | 1.50" | |
| Beam Shaft Spline: | 35 spline | |
| Fluid Spec: | SAE 75W-140 synthetic gear oil, a friction modifier may be required for limited skid differentials | |
| Fluid Chapters: | 3.25 - 3.50 quarts, e'er add together fluid to fill up plug level | |
| Unequal Comprehend Commodities Torque: | 29 - 39 ft-lbs | |
Sterling ten.25 Differential Service Parts List
| Office Clarification | Function Number(southward) | Remarks/Notes |
| Gear oil | 75W-140 total synthetic | [1] |
| Friction modifier | Motorcraft Xl-3 | [two] |
| Differential cover gasket | Spicer RD52002 | [three] |
[1] Any full synthetic 75W-140 gear oil will suffice; recommend Amsoil gear oil.
[2] Required for limited slip differentials.
[3] Gasket optional; differential cover may be sealed with RTV silicon only.
Sterling 10.25 Differential Oil Alter Procedures
The Sterling 10.25" axle comes from the manufacturing plant without a gasket betwixt the differential housing and comprehend. Rather, a dewdrop of silicon is used to seal these two surfaces. Y'all may choose, every bit we did, to install a gasket but it is acceptable not to. Procedures may vary slightly depending on application, every bit will the recommended fluid replacement intervals.
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• Remove the spare tire to gain full access to the rear end.
• Identify a drain pan beneath the differential housing to capture the oil one time the differential cover is removed.
• Make clean up any loose grease, clay, and debris that may have accumulated around the edges of the differential cover and then that information technology doesn't find its way into the housing once the cover is removed.
• 12 bolts hold on the differential cover; using a i/2" socket, generously loosen the peak 2 bolts and remove the remaining 10. Not removing the peak 2 bolts volition hold the cover in identify while the fluid drains, reducing the chances of creating a big, oily mess.
• With the superlative 2 bolts loosened and the remaining 10 removed, use a gasket scraper (or putty knife) to carefully pry the differential encompass and break the silicon seal about the bottom of the differential. Y'all may take to work the gasket scraper around the cover a few times in society to work it gratis. Be gentle and don't use excessive force, every bit you do not desire to bend or dent the diff encompass, which could compromise your seal during reinstallation.
• Allow the fluid to drain and then remove the differential embrace completely.
• Use a clean, lint free rag to soak up any remaining fluid trapped and/or pooled in the crevices of the differential housing.
• Carefully cover the differential'south internal parts with a clean trash bag to forestall debris from entering.
• Use a gasket scraper to completely remove any silicon and/or gasket cloth stuck to the differential housing. A fine grit (400+) sandpaper tin can also exist used in one case the larger pieces have been removed. To finish prepping this mating surface, wipe it with a clean rag that has been lightly doused with a solvent (brake cleaner, acetone, etc).
• Utilize a gasket scraper and a light grit sandpaper to remove all silicon/gasket cloth from the differential encompass, and then thoroughly clean the cover with a solvent and a make clean rag.
• Clean all the mounting bolts - whatsoever silicon stuck to the bolts should be removed. Brake cleaner and a pocket-size wire brush makes quick work of the former sealant.
• Once the differential cover and differential housing surfaces are prepped, remove the trash bag from within the differential housing.
Installation w/ Gasket:
If yous've chosen to install a gasket, then you demand to lay a dewdrop (1/8" - 1/iv" wide) of oil resistant RTV silicon around the differential comprehend (and around the mounting holes), then line up and set the gasket in identify on the cover. Y'all do not need to identify whatsoever silicon between the gasket and the differential housing - the gasket will seal to this machined surface and silicon is only necessary betwixt the gasket and differential cover.
Installation due west/ Silicon Merely:
If you've chosen not to install a gasket, run a small-scale bead (about 1/four" wide) of oil resistant RTV silicon around the surface of the differential housing where the cover mounts. Be sure to circle each of the mounting holes as well.
• Whether you lot've called to install a gasket or not, the next step is identical in both cases - reinstall the differential cover, installing all the bolts hand tight, and so lightly snugging them downwards in a star pattern.
• Torque differential encompass mounting bolts to fifteen - 20 lb-ft, and finally 29 - 39 lb-ft in a star design to ensure a positive, equally distributed seal.
• Allow the silicon to cure for the manufacturer'south recommended menses of time before continuing.
• The fill plug is located on the front, commuter's side of the differential housing (near the pinion), and requires a 3/8" drive socket wrench or billow bar. Remove the plug, and pump new gear oil into the differential until information technology begins to run out the fill plug. The 10.25 differential calls for 3.25 - iii.l quarts of 75W-140 full constructed gear oil. Obtain 4 quarts and fill up the differential housing until the fluid level reaches the summit of the fill plug.
• If the truck is equipped with a limited slip differential, you lot will need to add viii ounces of Ford's Twoscore-iii friction modifier before calculation gear oil. Without the friction modifier, a limited slip differential will chatter and the tires will chirp when making turns.
• Make sure to clean the fill plug before reinstalling and cheque for leaks in one case the procedure is complete.
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