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129 1303 20 Gear And Axle Pros And Cons Gm 8 5 Open Differential

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This is an open differential from a GM 8.5-inch axle. The sand-cast gears (as opposed to machined gears) have worn out after only about 80,000 miles. Often you won’t hear it before it fails, but you may notice play in the differential. This is why it’s important to have a magnetized drain plug that will collect the metal shavings and alert you to a problem.