76121X DANA SPICER Trac Lok Spline

Review DANA SPICER Trac Lok Oem New 3.73 35 Spline

The Dana Spicer 76121x 80 Trac-Lok differential is a high-performance, durable solution for serious off-roaders and heavy-duty vehicle applications. This unit is specifically designed for use with 3.73 gearing and 35-spline axles.

The Trac-Lok differential is a limited-slip differential that utilizes a clutch pack to provide power to both wheels when needed, while allowing them to free-spin when there is a significant difference in wheel speed. This feature improves traction in low-traction situations, such as during hard cornering or when one wheel encounters an obstacle, making it an ideal choice for off-road applications.

The 76121x Trac-Lok differential housing is made from strong, yet lightweight cast iron, ensuring durability and long-lasting performance. The housing is also designed with a large oil capacity, which helps to keep the differential cool and properly lubricated during heavy use.

The 3.73 gear ratio provides a balanced combination of torque and RPM for a wide range of applications. This gear ratio is suitable for both on-road and off-road driving, making it a versatile choice for those who require excellent performance in various driving conditions.

The 35-spline axles offer increased strength and durability compared to standard axles. The larger number of splines allows for thicker, stronger axle shafts, which can withstand the heavy loads and torque demands of off-road driving.

The Dana Spicer 76121x 80 Trac-Lok differential is designed to meet or exceed industry standards for performance and durability. It is backed by a strong warranty, offering peace of mind to those who demand the best from their vehicle components.

In summary, the Dana Spicer 76121x 80 Trac-Lok differential is a high-performance, durable solution for those seeking improved traction and performance in their off-road vehicle or heavy-duty application. Its strong cast iron housing, 3.73 gear ratio, and 35-spline axles make it an ideal choice for those who demand the best from their vehicle components.

The Dana Spicer 76121x 80 Trac-Lok differential with a 3.73 gear ratio and 35 spline output shaft is a popular choice among off-road enthusiasts for its durability and improved traction. Here are some pros and cons to help you make an informed decision about purchasing this differential.

1. Enhanced Traction: The Trac-Lok differential provides better traction by automatically locking the differential when needed, improving power transfer to the wheels and reducing wheel slip.

2. Durability: Dana Spicer differentials are known for their robustness and reliability, making them an excellent option for off-road use.

3. Versatile: This differential can be used in various applications, including Jeeps, trucks, and other off-road vehicles.

4. Easy Installation: The Trac-Lok differential is a direct replacement for many vehicles, making installation relatively straightforward.

1. Higher Cost: The Dana Spicer 76121x Trac-Lok differential is more expensive than a standard open differential.

2. Limited Slip: While the Trac-Lok differential provides improved traction, it doesn't offer the same level of control as a limited-slip differential.

3. Noise: Some users report an increase in differential noise after installing the Trac-Lok differential.

The Dana Spicer 76121x 80 Trac-Lok differential with a 3.73 gear ratio and 35 spline output shaft is an excellent option for those looking to improve their vehicle's traction in off-road conditions. Its durability, versatility, and ease of installation make it a popular choice among off-road enthusiasts. However, its higher cost and potential for increased noise are important considerations. Ultimately, the decision to purchase this differential depends on your specific needs, budget, and off-road requirements.

If you frequently encounter challenging off-road conditions and require improved traction, the Dana Spicer 76121x 80 Trac-Lok differential is a worthwhile investment. However, if you're on a tight budget or prefer a quieter differential, you may want to consider other options. Before making a purchase, ensure that you've identified the correct differential for your vehicle and consulted with a knowledgeable off-road parts supplier or mechanic.

Details:

4-5-6 speeds.

specifications differentialsdepo:

• for years: 1980
• brand: Dana Spicer
• mpn: 76121x
• type: Track Lock
• oe/oem part number: 76121x, D80, Dana 80, Spicer, Spicer 80
• gear ratio: 3
• placement on vehicle: Rear

payments differentialsdepo:

• wallet: paypal
• credit card: mastercard
• other

seller differentialsdepo:

• # reviews: 728
• rating: 100.0%
• city: sun valley, california

returns differentialsdepo:

• paid by: buyer
• policy: returns accepted
• time: 14 days

general differentialsdepo:

• category: Auto Parts > Transmission Drivetrain > Differentials, Assemblies > Additional

offer differentialsdepo:

• prices: $225.00–$351.34
• item condition:
  • New other (see details)
  • New
• availability: in stock
• options: ship-to-home
• sold #: 10
• in stock #: 5
• started: january 2, 2026

shipping differentialsdepo:

• class: expedited
• transit: 5-12 days
• service: usps priority mail
• carrier: usps
• type: fixed