2022 Chevrolet Silverado 1500: Transmission & Axle Ratios

Transmission Gear Ratios

The 2022 Chevrolet Silverado 1500 comes with two excellent automatic transmission options: an 8-speed and a 10-speed. The 10-speed automatic, co-developed with Ford, is now standard on most engine configurations, including the 2.7L Turbo High-Output, 5.3L V8, and 6.2L V8 models. The 8-speed automatic is typically paired with the 2.7L Turbo in lower trims.

8-Speed Automatic (Hydra-Matic 8L90)

10-Speed Automatic (Hydra-Matic 10L80)

Available Axle Ratios

The axle ratio is the final piece of the gearing puzzle, determining how many times the driveshaft turns for every one rotation of the rear wheels. A higher number means more torque multiplication. Chevrolet offers several ratios to tailor the Silverado's performance to specific needs.

How to Identify Your Axle Ratio

Knowing your truck's specific axle ratio is crucial for ordering parts or understanding its towing capabilities. Luckily, GM makes this easy.

1. Service Parts Identification (RPO) Sticker: The most reliable method is to check the RPO sticker, which is a silver label located in the glove box or on the driver's side door jamb. Look for the list of three-character codes. Codes starting with "G" typically relate to the rear axle. Find your code (e.g., GU5, GU6, GU2) in the list to confirm your ratio.
2. VIN Decoder: Several online VIN decoders can provide a build sheet or list of specifications for your specific truck, which will include the axle ratio.
3. Axle Tag (Less Common on GM): While more common on Ford and Ram trucks, some axles may have a small metal tag bolted to the differential cover. This tag often has the ratio (e.g., "3 23") stamped into it.

Towing vs. MPG Impact

Choosing an axle ratio involves a direct trade-off between towing power and fuel efficiency.

• Numerically Lower Ratio (e.g., 3.23): This is the "economy" gear. The engine turns fewer RPMs at highway speeds, which reduces fuel consumption. This is a great all-around gear for daily driving and light towing.
• Numerically Higher Ratio (e.g., 3.73): This is the "towing" or "performance" gear. It multiplies engine torque more effectively, making it easier to get a heavy load moving from a stop. The trade-off is higher engine RPMs on the highway, which leads to lower fuel economy.

The 10-speed automatic transmission helps mitigate this trade-off by providing a wider range of gears, allowing for both a low first gear for towing and tall overdrive gears for efficient cruising.

Common Issues

The driveline in the 2022 Silverado 1500 is generally robust, but like any mechanical system, it can have occasional issues.

• Ring & Pinion Whine: A whining noise from the rear of the truck that changes pitch with speed (not engine RPM) can indicate a problem with the ring and pinion gear set. This could be due to improper setup, lack of lubrication, or wear.
• Carrier Bearing Failure: The carrier bearings support the differential carrier inside the axle housing. A rumbling or grinding noise, especially while turning, can be a sign of a failing bearing.
• Limited-Slip Clutch Wear (G80 Locker): The G80 automatic locking differential is a popular option. Over time, the internal clutch packs can wear, causing it to be less effective. You might notice one wheel spinning more freely in low-traction situations.

If you hear any unusual noises from your truck's driveline, it’s best to have it inspected by a professional.

Find a driveline shop on Repairius.