Front axle u-joint needs replacing

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Aug 18, 2019 | 04:34 PM

Ber Zerker

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Joined: Jun 2019

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Front axle u-joint needs replacing

hey all,
I was gonna start on this today, but I got the wrong u-joint from rock auto. They sent me a moog 321, but I can see it's way too small for our 2007 f550 V8. After much searching it looks like I need to order a moog 424. If anyone can confirm I would be grateful.
My main concern is the gear oil or transmission fluid leaking from behind the u-joint. Can anyone tell me the name of the seal I need to replace so I don't order the wrong one? A part number would be very helpful. Thanks

Aug 18, 2019 | 06:54 PM

Dan V

Lead Driver

Joined: Jun 2013

Posts: 5,647

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From: north of Minneapolis, MN

Dana Spicer 2014835. But, it really looks like the inner axle seal is leaking.

Aug 18, 2019 | 10:56 PM

99f350sd

Lead Driver

Joined: May 2003

Posts: 9,303

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From: Lyndonville, Vermont

Ya inner alxle diff seal leaking. Check diff level now..you have to pull the axles and diff to change those....lotta work..

Aug 19, 2019 | 10:39 AM

Batman7777

Elder User

Joined: Sep 2016

Posts: 813

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I just had all four axle wheel seals replaced on a 2016 with 39,000 miles. This is NOT GOOD.

The pic above looks definitely the inner diff axle seals. The seals are in the front diff and leaking out.