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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2009 Posts: 6,049 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 6,049 | Mike, It most likely is a failed seal, although it could be your vent is blocked which can over-pressurize the axle and force lube out the seals. Either way if it's leaking now then it needs to be replaced. Take a little time and read through Section 4 of the 1955 2nd Series Truck Shop Manual (free access to everyone). I believe the info you need to start with is on Pg 4-5. You will have too remove the axle to replace the seal. BTW - Since you are having to pull the axle anyways, now is a good time to check the bearings and condition of the differential since you must open that up to remove the axles. 
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
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