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Mustang Rear Gear Ratio to RPM Chart

Written By: Andrew Cilio

Shop Mustang Gears

One of the best mods for your Mustang in terms of acceleration and increased performance is replacing the gears inside your rear differential. Give your Mustang the jump it needs and replace your stock gears with a set that works for you.

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Use this chart if you're wondering what gear ratio is currently in your Mustang, or looking to change your Mustang's rear gear ratio.

American Muscle

Estimated RPM Range for Highway Driving (~65MPH)

Anyone who’s purchased a used Mustang before knows how annoying it can be to figure out if the previous owner changed the rear gear ratio or not. Sometimes, you know they were changed but have trouble identifying what ratio the new gears are. Below, we have mapped out the usual suspects when it comes to aftermarket gear ratios. If you do not see the RPM for which you are reading at 65MPH for your particular transmission you can safely assume by going with whatever ratio of gears falls between the provided sets.

This chart will also give people who are thinking about changing their Mustang’s rear gears a look at the increase in RPMs they will see for each ratio. Note that the smaller the gear (smaller gears have higher ratios – 4.10s are SMALLER than 3.73, ect.) the more RPMs. Higher ratio gears can actually increase fuel efficiency around town but will use more fuel when driving on the highway, and vice versa.

Transmission Type3.55 Gears3.73 Gears4.10 Gears
AOD AODE (automatic transmission)1800 RPMs2000 RPMs2300 RPMs
4R70W (automative transmission)2000 RPMs2250 RPMs2350 RPMs
T5/T4 (manual transmission)2000 RPMs2250 RPMs2350 RPMs
TR3650 (manual transmission)1900 RPMs2250 RPMs2350 RPMs
T56 (6 speed manual transmission)1600 RPMs1800 RPMs2150 RPMs
Ford Racing Mustang Rear Gears
Fitment includes: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, GT, V6, Cobra, ShelbyGT500, Mach1, Bullitt, Boss, LX, SVO, EcoBoost

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