Dana 30 Gears
Dana 30 gears make up the internal gear parts of a Dana 30 differential. They consist of a meshing ring and pinion gear and a secondary unit of side and spider gears.
You may be aware that there are many gears inside of a Dana 30 differential (six to be exact), so when someone refers to them in general, they are most likely referring to the ring and pinion gears and not side or spider gears.
Dana 30 gears come in numerous ratios ranging from 2.72 to 5.38 on standard rotation axles. The reverse rotation Dana 30 can range from 2.73 to 4.56.
What is the ratio? The ratio indicates the number of rotations the pinion gear must make to turn the ring gear exactly one rotation. This is calculated by taking the number of teeth on the ring gear and dividing by the number of teeth on the pinion gear.
For example, take a look at the Dana 30 gear ratio of 4.56. Just by looking at this number (we don’t have to do any calculations just yet), we know that the pinion gear must rotate 4.56 times to rotate the ring gear exactly one time. In a Dana 30 4.56 gear ratio, there will be 41 teeth on the ring gear and 9 teeth on the pinion gear. 41 divided by 9 equals 4.555 (41/9=4.555) but by common mathematical rounding, you end up with a 4.56 ratio. In “gear talk” you would say that you have a “Dana 30 with four-five-six (or four-fifty-six) gears”.
Dana 30 gears come in a variety of ratios and knowing your vehicle’s needs will help you get the most out of choosing a gear set that’s right for you. You should always remember that numerically higher ratios mean your engine must run at higher RPMs to rotate the wheels. The same logic can be applied to numerically lower ratios in that they let your engine run at lower RPMs to rotate the wheels.
With that knowledge you’ll be able to choose a Dana 30 gear ratio best suited for your vehicle usage whether it’s for high-speed highway driving or slow-speed off-road driving.
Dana 30 gears come in many ratios and are available for the Dana 30 axle which is found on numerous vehicles of old and new. MY4BY OFF ROAD is a leading national supplier of ring and pinion parts for the home mechanic and professional in the off-road market.
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