| Dana 30 gears are the internal gearing parts of a | | | | the ring gear exactly one time. In a Dana 30 4.10 |
| Dana 30 differential. They consist of a meshing ring | | | | gear ratio, there will be 41 teeth on the ring gear and |
| and pinion gear and a secondary unit of side and | | | | 10 teeth on the pinion gear. 41 divided by 10 equals |
| spider gears. Although, technically, there are many | | | | 4.10 (41/10=4.10) and thus you have a 4.10 ratio. In |
| gears inside of a Dana 30 axle (six to be exact), | | | | "gear talk" you would say that you have a "Dana 30 |
| when one refers to Dana 30 gears, they are | | | | with four-ten gears". |
| referencing the ring and pinion gears -- not side and | | | | Dana 30 gears come in a variety of ratios and |
| spider gears. | | | | knowing your vehicle's needs will help you get the |
| Dana 30 gears come in numerous ratios ranging from | | | | most when choosing a gear set. It's important to |
| 2.72 to 5.38 on standard rotation axles and 2.73 to | | | | understand that numerically higher ratios mean your |
| 4.56 on reverse rotation axles. These numbers | | | | engine must run at higher RPMs to rotate the wheels. |
| indicate the number of rotations the pinion gear must | | | | The same logic can be applied to numerically lower |
| make to turn the ring gear exactly one rotation. This | | | | ratios in that they let your engine run at lower RPMs |
| is calculated by taking the number of teeth on the | | | | to rotate the wheels. With that knowledge you'll be |
| ring gear and dividing by the number of teeth on the | | | | able to choose a Dana 30 gear ratio best suited for |
| pinion gear. For example, consider the popular Dana | | | | your driving preferences whether they be for |
| 30 gear ratio of 4.10. Just by looking at this number | | | | long-distance highway driving or ultra-slow, off-road |
| (we don't have to do any calculations), we know | | | | rock climbing. |
| that the pinion gear must rotate 4.10 times to rotate | | | | |