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How to Identify a Chevy 10 Bolt

by Blaze Johnson

The GM 10-bolt differential was featured in both truck and passenger vehicle applications. Chevrolet 1/2 ton, 3/4 ton and 1977 through 1991 Blazer sport utility vehicles utilized the GM 10-bolt differential in front axle four-wheel drive applications. Certain GM 10-bolt rear end differentials utilize limited slip technology, also known as "Positraction." Because of the wide range of applications for the 10-bolt GM differential, several final drive gearing ratios are available. Checking to see if your Chevrolet vehicle has a 10-bolt differential will allow you to better prepare when repairing or performing maintenance to your front or rear drive axles.

Step 1

Place your vehicle in "Park" and engage the parking brake. (ref#2)

Step 2

Examine the rear axle carrier, underneath your vehicle. The rear axle carrier features a round cover, located between the left and right axle tubes, visible from the rear of the vehicle.

Step 3

Count the number of bolts that secure the differential cover. As the name implies, GM 10-bolt differentials will utilize 10 bolts to secure the differential cover to the carrier. Differentials that feature Positraction will have a small identification number comprising two or three digits, located on the lower right side of the differential cover.

Repeat the above steps when identifying front differential types in four-wheel drive applications.

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