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Is the yoke marked up where the seal rides? It might be worn and that will kill a new seal. Is the diff vent hose plugged? That can cause pressure to build up in the diff and blow the seal out.
Were the seals installed correctly or just beat in crooked or anything? Do the pinion bearings feel ok? Not loose feeling or rough?
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.