dek1581 Posted March 28, 2015 Share Posted March 28, 2015 I saw awhile back where if for instance you want to swap a 707 gas with a 673 diesel (or later maxidyne) you should change the rear end gears. I know the gas revs higher than the diesel. would it matter whether you use an automatic or manual tranny? I'm more interested with top speed (highway) than low-end performance. Quote Link to comment https://www.bigmacktrucks.com/topic/39465-gear-ratiosgas-vs-diesel/ Share on other sites More sharing options...
j hancock Posted March 28, 2015 Share Posted March 28, 2015 Style of transmission wouldn't matter. Look for a ratio such as 3.71, 4.00, or 4.25 for better highway speed for a diesel application with a direct high gear trans. Lower rear gears can work if using an overdrive trans. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/39465-gear-ratiosgas-vs-diesel/#findComment-284457 Share on other sites More sharing options...
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