* 3.42:1 - This gear ratio is found in Suburbans with the 5.7L V8 engine and the 4-speed automatic transmission. It provides a good balance of fuel efficiency and towing capacity.
* 3.73:1 - This gear ratio is found in Suburbans with the 5.7L V8 engine and the 5-speed automatic transmission. It provides slightly better towing capacity than the 3.42:1 gear ratio, but it also reduces fuel efficiency slightly.
* 4.10:1 - This gear ratio is found in Suburbans with the 6.5L V8 diesel engine and the 4-speed automatic transmission. It provides excellent towing capacity, but it also reduces fuel efficiency significantly.
In addition to these three gear ratios, there are also a few other rare gear ratios that can be found in certain models of the 1999 Suburban. These gear ratios include:
* 3.08:1 - This gear ratio is found in some Suburbans with the 5.7L V8 engine and the 2-speed automatic transmission. It provides excellent fuel efficiency, but it also reduces towing capacity significantly.
* 3.23:1 - This gear ratio is found in some Suburbans with the 5.7L V8 engine and the 4-speed automatic transmission. It provides a good balance of fuel efficiency and towing capacity, but it is not as common as the 3.42:1 or 3.73:1 gear ratios.
The specific gear ratio of your 1999 Suburban can be found on the vehicle's VIN tag.
