Here's how to find the information you need:
1. The axle ratio: This is the most critical part of the gear ratio. It's the ratio between the driveshaft and the axle. Look for a sticker on the driver's side doorjamb. This sticker lists various specifications, and often includes the axle ratio (e.g., 3.73, 4.10, 4.56). If it's not on the sticker, you can check:
* Differential tag: Locate the differential (rear axle) itself. There's usually a metal tag riveted to it indicating the gear ratio. This is the most reliable method. You'll likely need to get under the truck to see it.
* Vehicle Identification Number (VIN): A Dodge dealer or a reliable online VIN decoder might be able to pull up the axle ratio using the VIN.
2. Transmission gear ratios: The transmission's gear ratios are less crucial for overall *overall* gear ratio but still important to know for calculations. You can find this information in:
* Owner's manual: Check the specifications section of your owner's manual.
* Online resources: Search online for "[Your specific transmission type] gear ratios." You'll need to know what transmission your truck has (e.g., 6-speed automatic, G56 manual).
3. Transfer case gear ratio (4x4 only): If you're interested in the overall ratio when in 4x4, you'll need the transfer case ratio as well. This is usually found on a tag on the transfer case itself (often requires getting under the truck). It's usually a simple ratio like 2.72:1 or similar.
Calculating Overall Gear Ratio (Example):
Let's say you found these values:
* Axle Ratio: 3.73:1
* Transmission 1st Gear: 4.00:1 (example)
* Transfer Case (4x4 low): 2.72:1
To calculate the overall gear ratio in 1st gear, 4x4 low, you would multiply:
3.73 x 4.00 x 2.72 = 40.5:1 (approximately)
This means for every 40.5 rotations of the driveshaft, the wheels will rotate once. Remember to do this calculation for each gear in the transmission, considering whether you are in 4x2 or 4x4 high/low. 4x4 high generally only incorporates the axle and transmission ratios.
