Identifying a Dana 70 Rear Axle: A Comprehensive Guide
The identification of a Dana 70 rear axle can be crucial for vehicle restoration, repair, and maintenance. Proper identification ensures that the correct parts are used, which is essential for the performance and longevity of your vehicle. This article provides a detailed guide on how to identify a Dana 70 rear axle through visual inspection, measurements, and markings.
Visual Inspection and Key Features
The process of identifying a Dana 70 rear axle begins with a thorough visual inspection. Multiple key features are essential to recognize when comparing the axle to other models.
Diff Cover Shape: The Dana 70 typically features a larger, more oval-shaped differential cover. This cover often has a flat bottom with a raised center. This feature differentiates it from axles such as the Dana 44 or Dana 60. Size: The Dana 70 is generally larger and heavier than other axles, especially the Dana 44 or 60, making it stand out when comparing side by side. Axle Tube Diameter: The diameter of the axle tubes on a Dana 70 is usually 3 inches. This measurement can be a quick way to identify the axle, especially for those familiar with the various models. Identification Markings: Look for tags or stamps on the differential cover or axle housing. These may include numbers or letters that indicate the model. Pay particular attention if the marking starts with 603 or 605, which is a strong indicator of a Dana 70.Key Features for Identification
The following sections provide more detailed steps and key features to help you accurately identify a Dana 70 rear axle.
1. Differential Cover Shape
The differential cover of a Dana 70 axle is one of the most distinctive features. It is typically oval-shaped, differentiating it from other axles. This cover often has a flat bottom and a raised center, making it easy to spot.
2. Measure the Axle Tube Diameter
The diameter of the axle tubes on a Dana 70 is generally 3 inches. To confirm, measure the diameter of the axle. This measurement is a quick and effective way to identify the axle type. If the diameter is 3 inches, it is a strong indicator that the axle is a Dana 70.
3. Check for Identification Markings
Look for a tag or stamp on the differential cover or axle housing. These markings may include numbers or letters that indicate the model. If the number starts with 603 or 605, it is a definitive sign that the axle is a Dana 70.
4. Gear Ratio
The gear ratio of a Dana 70 is commonly used in heavier-duty applications. The gear ratios range from 3.54 to 5.13. You can check the gear ratio by counting the number of teeth on the ring and pinion gears. This measurement can provide further confirmation that the axle is a Dana 70.
5. Applications
The Dana 70 rear axle is commonly found in heavy-duty trucks, such as Dodge, Ford, and GM models. This identification can help confirm the axle type, especially when the vehicle model and year are known. Knowing this information can greatly assist in the identification process.
6. Differential Type
Check if the differential is limited-slip or open. Dana 70 axles can come with various differential types, which can help in identification. Limited-slip differentials provide better traction, especially under heavy loads.
7. Bolt Patterns
The wheel bolt pattern can also provide clues. Dana 70 axles typically have an 8-lug pattern, especially in truck applications. This feature can help confirm the axle type, particularly when combined with other identification methods.
Conclusion
By combining these features and characteristics, you should be able to accurately identify a Dana 70 rear axle. For a more comprehensive identification, taking pictures and comparing them to reference images online can also be helpful.
Accurate Identification: The combination of these visual, measurement, and marking techniques ensures that you can confidently identify a Dana 70 rear axle. Proper identification is crucial for the maintenance and restoration of heavy-duty vehicles.
Reference: For a detailed reference, you can also use online resources such as those from Torque, which provides comprehensive information on identifying Dana 70 rear axles.