2003 F250 Rear Axle Pinion Seal Change - Diesel Forum - TheDieselStop.com
1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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post #1 of 4 (permalink) Old 04-02-2010, 06:58 PM Thread Starter
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2003 F250 Rear Axle Pinion Seal Change

I have a 03 F250 which recently developed a leak in the pinion seal on the front of the rear axle. It has a Ford axle with 10.5 inch ring gear. Are these known to have problems? It only has 46,000 miles on it and it gets taken very good care of. There has never been a trace of any leaking until recently. Should replacing the seal fix the problem? I'm planning on doing the work myself. Is there anything I should be aware of? I was also looking into putting a locker of some kind in the differential also. Are there any available for this axle? Would that be a good idea or bad?

Thanks for your help!

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post #2 of 4 (permalink) Old 04-02-2010, 07:34 PM
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might be the vent. if its clogged the pressure will cause a leak. i have seen this more than once. take the hose off at the axle and blow air through it, then check the barb fitting on the axle. hope this helps.

1998 E350. ccv mod, 4" exhaust. 299000 miles on original E4OD!
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post #3 of 4 (permalink) Old 04-02-2010, 11:32 PM
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These differentials are notorious for pinion seal failures although the first failure for most is closer to 70,000 miles. Do a search on this forum for the proper procedures to replace the seal. Smokey Wren has posted the factory procedures several times. Many people have used short cut methods and not experienced problems. I'm sure others will chime in on this thread.

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post #4 of 4 (permalink) Old 04-03-2010, 12:25 AM
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best $250 you can spend at ford. w/ 12 month warr.

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sold a very thirsty 350 4x4 cc long bed, all white, 06 KR
350 4x4 cc long bed, all white, 01
sold 350 4x4 cc long bed, drw, all black, 99
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