However, common ratios you might find include:
* 3.08: This was a fairly common ratio for better fuel economy on the highway.
* 3.42: A compromise between fuel economy and towing/hauling capability. Quite popular.
* 3.73: Offered better acceleration and towing capacity at the expense of highway fuel economy. More common on models equipped for towing.
* 4.10: A relatively low gear ratio, providing excellent acceleration and towing power, but significantly impacting fuel economy on the highway. More common on heavier-duty or higher-optioned trucks.
To know the *exact* gear ratio in *your* specific 1987 Chevy Suburban, you need to:
1. Check the Vehicle's Data Plate (or "Builder's Plate"): Located in the driver's side doorjamb, this plate often lists the axle ratio. Look for something like "Axle Ratio: 3.73" or a similar notation.
2. Inspect the Differential: This requires getting under the vehicle. The ratio is usually stamped on a tag on the differential housing itself. However, this might be difficult to read depending on rust or other conditions.
3. Calculate it: This involves turning the driveshaft one full rotation and counting the number of times the axle shafts rotate. This requires tools and some mechanical knowledge.
The data plate is the easiest and safest method.
