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So you’re in the market for a new medium duty truck. One of the specs you’ll need to consider is the drive-axle ratio. There’s a lot to think about here, especially considering you may have a dozen or so drive-axle ratios to choose from, depending on your truck’s class, make, model and rear-axle capacity.
Medium duty trucks with a gross vehicle weight rating (GWVR) between 19,500 lb. and 26,000 lb. can operate with a drive-axle ratio anywhere from 2.69:1 to 7.17:1. Your choice will affect your truck’s top speed and fuel economy as well as its load-pulling ability. And it’s something of a trade-off:
So for obvious reasons, your goal is to choose the ratio that best matches your medium-duty truck’s intended use and workload. Here are 10 things you should keep in mind to determine the optimal drive-axle ratio for your next vehicle:
So which drive-axle ratio is the best for your new truck? If you consider all these factors, you’ll pick the right number, whatever it turns out to be.