How do I identify my Chevy truck rear end?

Identifying Your Chevy Truck Rear End
If you want to identify the rear end of your Chevy truck, you can visually identify it based on its features. According to Chevrolet High Performance, the most common GM/Chevrolet rear ends are the 7.5- and 8.2-inch, 10- and 12-bolt, and Dana 60. Although Chevrolet has used different rear end models throughout its history, all can be visually identified.
To determine the type of rear end in your Chevy truck, you can consider the number of bolts. For example, there are ten bolts on the GM 10-bolt and 8.25, and twelve bolts on the GM 12-bolt rear end. Additionally, you can use the gasket size and shape to identify all Chevy truck rear-ends compared with an identification table.
It’s also important to note that any previous swapping of gear sets or rear end gears will make this method of identifying the types of differentials of little use to you.
If you have access to the RPO (Regular Production Option) codes, you can identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled Service Parts Identification inside the driver’s door panel or glove box. The list of RPO codes contains valuable information about your GM vehicle, including the axle identification, differential type, and gear ratio.
By considering these methods, you should be able to identify the rear end of your Chevy truck.

Where do I find my GM axle code?

you guessed it, Axle and Differential specs. 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.

How do I identify my GM rear differential?

The most accurate differential identification is provided by the bottom line of the tag number or axle tube stamp.

Can you tell gear ratio from VIN?

You don’t. That information is not contained in the VIN, UNLESS a specific model only gets one rear end ratio. VIN tells country of manufacture, vehicle make, class, engine type, size, date of manufacture, plant and serial number. That is the ONLY information contained by the VIN.

How do I know what Chevy axle I have?

To find the axle gear ratio of any GM vehicle, locate the RPO sticker (typically located in the glove box) and write down any codes starting with F, G, or H.

How do I know what rear end my Chevy truck has?

You can typically find your RPO code on driver side door panel or glove box. General Motors rear end differentials are referred to by the diameter of the ring gear, i.e. 7.5 inch, 8.5 inch, 10.5 inch.

What type of rear differential do I have?

The easiest way to tell if you have an open differential is to jack up the car and spin one of the rear tires. If the other wheel spins in the opposite direction, you have an open differential. If it spins in the same direction, you have a limited slip differential, or LSD.

How do I know what Chevy differential I have?

If the ID tag or stamp is missing or unreadable, differentials can be identified by the number of cover bolts, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter. They can also be identified by whether the center section is an integral or dropout design.

How do I know if I have 8.8 or 9.75 rear end?

On the passenger’s side upper and lower corners, there’s two semi-circular divots that can easily be seen when looking at the cover from straight on. While the Super 8.8’s cover has a bulge for the ring gear, it’s not anywhere near as pronounced as the 9.75’s.

How do I know what axle my F 350 has?

How Do I Find the Axle Ratio and Limited Slip of My Ford Vehicle?

1. Locate the Safety Compliance Certification Label on the driver’s side front or rear door panel.
2. Find the word AXLE under the bar code.
3. Find the two-digit code under AXLE.

How do I know what rear differential is in my Silverado?

Information about Differentials in GM vehicles can usually be obtained by looking at the RPO or “Regular Production Option” codes contained in the Service Parts Identification tag in the glovebox or the driver’s side door jamb (B-Pillar).