If it's a 4WD model, the ring gear size will depend on the axle ratio. There's no single size for all 4WD 1999 Silverado trucks. To find the ring gear size, you'll need to:
* Check the sticker on the driver's side doorjamb: This often lists the axle ratio (e.g., 3.73, 4.10).
* Look at the differential tag: The tag is usually located on the differential housing itself. It will show the axle ratio.
* Check the owner's manual: This might list the axle ratio.
Once you have the axle ratio, you'll likely need to consult a parts catalog or a website specializing in GM parts to determine the corresponding ring gear diameter. The ratio alone doesn't directly tell you the ring gear size; it's the ratio of the ring gear teeth to the pinion gear teeth.
