What kind of rear differential fluid for 05 Durango?

The rear differential in a 2005 Dodge Durango typically requires a 75W-90 GL-5 gear oil. If your axle is a limited-slip unit, you’ll need to add a friction-modifier as specified by the axle design. Using the right fluid helps prevent wear and noise and keeps the differential operating smoothly.

In more detail, Durango rear axles from that era generally accept gear oil labeled GL-5 in the viscosity range of 75W-90 (synthetic or synthetic-blend preferred for colder climates and improved protection). Some models with older or specific axle codes may also accept 80W-90. The exact requirement depends on whether the axle is open or has a limited-slip differential (LSD) and on any manufacturer additives. Always consult your owner’s manual or check the axle code tag on the differential cover to confirm the correct specification and whether a friction modifier is required for LSD.

Understanding the 2005 Durango rear axle

Identifying the correct fluid starts with knowing whether your Durango has an open rear differential or a limited-slip design. The LSD variant commonly needs an additional friction-modifier additive in combination with the gear oil to ensure the clutches operate correctly. If you’re unsure of your axle type, inspect the differential cover for markings or consult the VIN/owner manual. Using the wrong oil or skipping required additives can lead to chattering, noise, or accelerated wear.

How to identify LSD or open axle

Check the axle tag or differential cover for markings (such as LSD or limited-slip designations). If in doubt, contact a dealer or reference your service manual with the exact axle code. In many Durangos, the LSD option is noted in the recommended fluids section for that axle.

Recommended fluids for the 2005 Durango rear differential

These options reflect common specifications found in 2005 Durangos and are compatible with most rear axles, including LSD variants when used with the correct additive.

• 75W-90 GL-5 gear oil (synthetic or synthetic-blend preferred for protection and temperature performance).


• 75W-90 GL-5 mineral or synthetic-blend gear oil (cost-effective option if synthetic is unavailable).


• 80W-90 GL-5 gear oil (legacy option; ensure it meets GL-5 and your axle’s requirements).


• Friction modifier additive for LSD applications (only if your axle is LSD and the product requires it; add per the product’s instructions).

Note: Do not substitute automatic transmission fluid (ATF) for rear differential gear oil unless the manufacturer explicitly specifies it for your axle. If in doubt, verify with the owner’s manual or a dealership service advisor.

In short, most 2005 Durango rear axles call for 75W-90 GL-5 gear oil, with a friction modifier added when a limited-slip differential is present. The exact requirement can vary by axle code, so checking the manual or the axle tag is essential.

How to service the rear differential

servicing the rear differential can be straightforward, but the approach changes slightly if you have LSD or high mileage. The following steps outline a standard drain-and-fill process, with notes for LSD-equipped axles.

• Prepare: Park on level ground, engage parking brake, raise the vehicle if needed, and gather the proper gear oil, a drain pan, sockets, and a new fill plug washer if required.


• Drain: Remove the differential drain plug and allow the old oil to drain completely; inspect the drain plug for metal shavings or debris.


• Fill: Reinstall the drain plug, snug to spec, then access the fill hole and add new oil until it begins to seep out of the fill hole; reinstall the fill plug and torque to spec.


• Finish: Clean any spilled oil, lower the vehicle, and run the engine briefly to circulate the new oil; check for leaks after a short test drive.

After the maintenance, monitor for any unusual noises or leaks. If you notice a leak or unusual drivetrain behavior, recheck the fill level and consider whether the correct oil grade and any required LSD additive were used.

Summary

For a 2005 Durango rear differential, the standard recommendation is a 75W-90 GL-5 gear oil, with a friction-modifier additive if the axle is a limited-slip type. Always verify the exact specification for your axle by consulting the owner’s manual or the axle code tag, and avoid ATF unless explicitly specified. Proper fluid selection and a correct fill will help maintain rear axle performance and longevity.

How much fluid does a Dodge Durango rear differential hold?

The Dodge Durango's rear differential fluid capacity is between 0.90.90.9 and 1.41.41.4 liters (1.0 to 1.5 quarts). The exact amount can vary, so it is best to fill the differential until the fluid starts to trickle out of the fill hole, which is the correct level. 
This video explains how to change the rear differential fluid in a Dodge Durango: 1mMatty SRT (MattySRT)YouTube · Sep 28, 2023
Fluid capacity

• Capacity: 0.9−1.40.9 minus 1.40.9−1.4 liters (1.0−1.51.0 minus 1.51.0−1.5 quarts). 
• Filling procedure: Fill the differential until the fluid begins to slowly overflow from the fill plug hole. 

Important considerations

• Check the fill hole: Always use the fill plug to check the level rather than relying solely on a measurement. Fill until the fluid just starts to leak out of the fill hole, as this indicates the correct level. 
• Fluid type: Be sure to use the correct type of gear oil for your specific Durango model. For example, 2014-2021 3.6L V6 models recommend a 75W8575 cap W 8575𝑊85 API GL-5 gear oil. 
• Friction modifier: If your vehicle has a limited-slip differential, a friction modifier may also be required. Check your owner's manual or a repair guide for specific instructions. 

You can watch this video to learn about the different types of differential fluids: 47sSpeedway MotorsYouTube · Jan 28, 2025

What kind of gear oil does a 2004 Dodge Dakota take?

Valvoline – High Performance Transmission & Differential Gear Oil: Conventional 75W-90, 1 Quart (Part No. VV820)

What is the difference between 80w90 and 75w90 gear oil?

75W-90 gear oil is generally thinner in cold temperatures and provides better flow, fuel efficiency, and protection in extreme climates, while 80W-90 is thicker and is a more traditional choice for standard conditions. Choose 75W-90 for colder climates or if your vehicle operates under high-stress conditions and has longer drain interval requirements. Opt for 80W-90 for standard, non-extreme driving, especially in heavy-duty vehicles or if cost-effectiveness is a priority. 
This video explains the difference between 75W-140 and 80W-90 gear oil and how to read gear oil viscosity numbers: 1mMidwest GarageYouTube · Oct 7, 2015
75W-90 gear oil

• Better cold-weather performance: The "75W" indicates it flows better at lower temperatures compared to 80W-90, which is beneficial in cold climates. 
• Synthetic base: It is often synthetic-based, meaning it has better thermal stability and resistance to oxidation and shearing over time. 
• Increased efficiency: The thinner viscosity can lead to slightly better fuel economy. 
• Ideal for: Extreme climates, modern vehicles, limited-slip differentials, and applications requiring longer drain intervals. 

You can watch this video to learn how to choose the right gear oil for your vehicle: 53sBackyard Hot RodsYouTube · Jul 9, 2022
80W-90 gear oil

• Traditional and common: A widely available and traditional gear oil for many applications. 
• Higher viscosity in heat: It has a higher viscosity base oil and is thicker than 75W-90 at high temperatures, providing a substantial oil film for protection. 
• Cost-effective: Often more budget-friendly than its synthetic 75W-90 counterpart. 
• Ideal for: Standard conditions, heavy-duty trucks, and vehicles where cost-effectiveness is a key factor. 

Key considerations

• Check your owner's manual: Always follow the manufacturer's specific recommendation for your vehicle, as using the wrong oil can lead to shifting issues or premature wear. 
• Synthetic vs. Conventional: Many 75W-90 oils are synthetic, while 80W-90 is often mineral-based. Synthetic oils generally offer superior performance and longevity. 
• Mixing oils: While you can mix them, the resulting oil's performance will be a compromise between the two types. If you mix them, know that you are reducing the overall quality. 

What type of gear oil goes in the rear differential?

The correct gear oil for a rear differential is determined by the vehicle manufacturer and depends on factors like climate and driving conditions. Common options include 75W-90 or 80W-90 for most cars and light trucks, while 75W-140 or 80W-140 is often recommended for heavier use like towing or off-roading. Always check your vehicle's owner's manual for the specific weight and any special fluid requirements, such as those for a limited-slip differential. 
Common gear oil types

• 75W-90: A versatile and very common choice for daily driving in a wide range of conditions. 
• 80W-90: Another standard option, often used for light-duty vehicles. 
• 75W-140: Better suited for high-stress applications, such as towing or frequent heavy loads. 

How to choose the right oil

1. Consult your owner's manual: This is the most important step, as it will list the specific viscosity and any special requirements for your vehicle. 
2. Consider your driving conditions: If you regularly tow, haul heavy loads, or drive in extreme temperatures, you may need a thicker oil like a 75W-140. 
3. Check for limited-slip differentials: Some differentials require a special fluid or an additive for the limited-slip clutch pack. The owner's manual or service manual will specify this. 
4. Choose synthetic if appropriate: Synthetic gear oil generally offers better protection in extreme temperatures and can have longer service intervals, though it may have a higher initial cost.