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Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box.
The GM 10-bolt rear end is quite possibly the most misunderstood and undervalued rear differential ever created. Even though it has been used in every major GM rear-wheel-drive platform, the 10-bolt has a bad reputation for being a low-performance unit. Nothing could be further from the truth.
The GM RPO Codes label is usually located inside the glove box or on the Driver’s Side Door Jamb (on the B-Pillar). The silver placard will be labeled “Service Parts Identification” and includes a bunch of three-digit codes.
When repairing or upgrading differential parts, the first and most important step is to identify your existing axle / differential. Ensure accuracy by checking the tag numbers or stamps on the axle or by utilizing the RPO codes on GM vehicles.
1958-1970 Chevy Rear Differential code Identification. Using the charts below, you will be able to learn alot about the rear differential in your classic full size Chevy. The gear ratio codes are located on the front passenger side of the differential as shown in the illustration below.
Understanding GM rear end identification codes can help you determine the specifications of different models and years. This guide will walk you through the process of locating and interpreting these codes effectively.
Differential Identification. Dana Dana 30 - Standard, Reverse Rotation, CS & TJ Dana 30 - JK ... GM 7.6" IFS - Front - Late Model Midsize Truck GM 7.6" IRS (Late ...
Accurate Differential Identification is the first and most important step in your differential repair, upgrade or overhaul project. The following information is provided to help you identify the differential you are working on.
General Motors has a wide range of front and rear ends! We carry everything from the 7.25" IFS front end parts, to the large 11.5" rear end parts for 1-ton trucks. We make it easy to verify your exact rear end by providing specs and year, make, and model applications for each differential listed.
Identifying a GM 10-bolt rear end housing requires measurements, locating casting numbers, and knowing what to look for. The 8.5s and 7.5s look remarkably similar, so you’ll need a measuring tape to confirm.