1 recall across 1 model year
The GMC H8500 has 1 recall affecting the 1979 model year, where a machining defect in the Detroit Diesel Allison transmission's forward clutch housing can cause the vehicle to creep or roll forward even when the transmission selector is in neutral. Because oil does not drain properly from the clutch housing, the forward clutch can remain partially engaged, meaning the vehicle may move without the driver intending it to.
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