GMC Sierra owners have reported 6 problems related to axle shaft seal (under the power train category). The most recently reported issues are listed below.
Front end shook while braking. Braking distance seemed normal. Vehicle was taken to dealer numerous times, and dealer replaced and turned front rotors four times. In may 2003, mechanic noticed rear axle seal was leaking grease onto rear brake drums, causing rear brakes to fail, seal was replaced. Currently, seal is leaking again, rear brake drums need to be replaced.
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all problems of the 1998 GMC Sierra
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Rear axle pinion seal failed. Nlm.
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all problems of the 1997 GMC Sierra
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Front axle grease seal failed causing noise when making left turns, dealer replaced seal yet the vehicle continues to make noise. Nlm.
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all problems of the 1999 GMC Sierra
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Initial problem 09/02/98 was both rear axle seals leaking causing brakes to fade. Again on 11/04/98 rear axle seals leaking, adjusted brakes. 11/06/98 brakes locking-up. 11/13/98 brakes grabbing, replaced both rear brake shoes, abs light on-module not activating brake release-replaced anti-lock brake module-master cyl bypassing-replaced master cyl. 01/20/99 abs light comes on-brake peddle hard to push-replaced abs brake valve. 03/23/99 brakes failed to slow vehicle-involved in accident-replaced abs pressure modulating valve.
Left rear axle seal failed to hold grease in axle, grease dripped all over left rear wheel & brake pads, potential for fire/brake failure, dealer replaced seal & brake pads, refilled axle with grease.
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all problems of the 1996 GMC Sierra
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Vehicle stalled while driving. Had coasted to side of road. Restarted & vehicle shut off. The differential seal was leaking oil. The vehicle was making noises in the universal joint. Taking vehicle to mechanic. Also, leaf spring on passenger's sid efailed/replaced/smelled oil due to pcv valve failure, an dtransmission would not shift into drive or reverse.