2016 Chevrolet Silverado 1500: Transmission & Axle Gear Ratios

Transmission Gear Ratios

The 2016 Chevrolet Silverado 1500 came with two excellent automatic transmissions, the 6-speed 6L80 and the 8-speed 8L90, offering a great blend of performance and fuel efficiency.

6-Speed Automatic (Hydra-Matic 6L80)

8-Speed Automatic (Hydra-Matic 8L90)

Available Axle Ratios

Chevy offered a wide range of axle ratios to tailor the Silverado's performance to specific needs, from maximizing fuel economy to enabling incredible towing feats.

How to Identify Your Axle Ratio

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

1. Check the RPO Sticker: Open the driver's side door and locate the silver "Service Parts Identification" sticker in the glove box. This sticker contains a list of three-character Regular Production Option (RPO) codes. Scan this list for one of the codes in the table above (e.g., GU4, GU5, GU6, GU2) to determine your factory-installed axle ratio.

2. VIN Decoder: While less direct, online VIN decoders can often provide detailed build-sheet information, including the axle ratio, for your specific vehicle.

Towing vs. MPG Impact

An axle ratio represents the number of times the driveshaft turns for every single rotation of the rear wheels. This directly impacts both towing capacity and fuel efficiency.

• Numerically Lower Ratios (e.g., 3.08, 3.23): These are known as "taller" gears. The engine needs to do less work (lower RPMs) to maintain highway speeds. This results in better fuel economy but offers less mechanical advantage for getting a heavy load moving. It's ideal for highway cruising and light-duty work.

• Numerically Higher Ratios (e.g., 3.42, 3.73): These are "shorter" gears. The engine operates at higher RPMs at any given speed, which means more power is readily available at the wheels. This is fantastic for towing heavy trailers, hauling significant weight in the bed, and quicker acceleration. The trade-off is a noticeable decrease in fuel economy.

For the 2016 Silverado 1500, a 3.42 ratio paired with the 5.3L or 6.2L V8s and the Max Trailering Package provides a formidable combination of towing power and everyday drivability. For those who prioritize MPG above all, a 5.3L V8 with the 3.08 ratio is the most efficient setup.

Common Issues

While the driveline in the 2016 Silverado is generally robust, high-mileage or hard-working trucks can eventually exhibit certain issues. Keep an ear out for:

• Ring & Pinion Whine: A howling or whining noise that changes pitch with vehicle speed (not engine speed) can indicate worn ring and pinion gears. This often requires a complete rebuild or replacement of the differential gear set.
• Carrier Bearing Failure: A rumbling or grinding noise, especially under acceleration, can point to failing carrier bearings within the differential.
• Limited-Slip Clutch Wear: If your truck is equipped with the G80 locking differential, worn clutches can lead to a lack of engagement, causing one wheel to spin freely in low-traction situations.

Early detection of these symptoms is key to preventing more catastrophic and expensive failures down the line.

Find a driveline shop on Repairius.