Nitro Gear & Axle Helical Gear Limited Slip for Dana 44 3.73 & Down 19 Spline Dual Drilled 7/16" & 3/8" Rear

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Nitro Helical Worm Gear Limited-Slip Differential 19 Spline, Dual Drilled 7/16" & 3/8" for Dana 44

You'll want to check out this article on Overland Journal/Expedition Portal about the benefits of installing a Nitro Gear and Axle Worm Gear Limited Slip.

Tech Notes:

Dual Drilled 7/16" & 3/8"

19 spline Fits older Dana 44 Axles with 3.73 or lower numerical ratios.

The Nitro Helical Worm Gear is a torque-sensitive mechanical limited-slip differential that uses worm gears and spur gears to dispense and distinguish input power between two drive wheels or front and back axles. This is a completely separate design from the common beveled spider gear designs seen in most of the automotive industry.

Just like any LSD, the Nitro Helical Worm Gear functions as a standard or open differential under normal driving conditions, allowing one wheel to spin faster or slower as necessary. When a wheel experiences a loss of traction, the gear separation forces start to take effect and distributes the torque to the high-traction wheel by increasing the helical-shaped gears mesh force until wheel spin is reduced or entirely stopped. Once the vehicle exits the low traction condition, the differential resumes normal operation.

What's nice about the operation of a Nitro Helical Worm Gear LSD, is its characteristics; smooth, quiet and automatic. This LSD will engage without any driver awareness or require any action. It also has no wearable components and requires no maintenance, producing less time on the rack and more on the road.

Nitro Gear & Axle strives to provide the highest quality differential & axle components available. We take the steps necessary to ensure our parts are dependable. Our product range is continually growing to meet the needs of consumers for new ratios and Fits. At Nitro we know differentials, and know what it takes to provide you with high quality components.

"The Dana 44 Trademark referred to herein are trademarks of Dana Limited. The Dana 44 trademark are used for informational purposes only, and there is no connection between Nitro Gear & Axle or JT's Parts & Accessories and Dana."


  • Limited-slip operation Helical-style pinion gears Maintenance free No additive required No Clutches or cones to wear out Smooth/Great traction improvement even over an OEM LSD


Differential: Dana 44

Gear Ratio: 3.73 & Down

Axle Splines: 19

Ring Gear Bolts: 10 (not included) Dual Drilled

Manufacturer: Nitro Gear & Axle

Warranty: 1 Year


1965-1970 Jeep CJ5 & CJ6

1957-1966 Ford F100 Pickup

1961-1988 Jaguar XKE XJS XK6

Checker Cab & Limousine

1964-1967 Sunbeam Tiger

1961-1971 International Scout

2018+ Mahindra Roxor


*All Nitro Gear & Axle brand products are warrantied to be free of manufacturer defects for the specified period. Warranty requests must be made by the original purchaser and submitted by the dealer purchased from. Any parts sent for warranty consideration must be pre-approved and shipped prepaid freight to our facility with copy of RGA for our inspection & determination. We will not pay for labor, shipping cost, loss of revenue or perishable goods, commercial losses, costs of telephone calls, shipping or general inconvenience. This is our only warranty expressed or implied. Unauthorized warranty returns may be refused. Warranty generally covers MFG defects in material or workmanship. Abuse, overloading, improper lubrication, misuse, commercial or competition use voids warranty. Normal characteristics are not warrantable, such as Gear whine. Minor cosmetic flaws, dings, burrs from shipping or manufacturing, are not considered defect, it is installer responsibility to address these at time of install. Customer is responsible for shipping charges if warranty is granted. Warranty is for the original purchaser/user, is not transferable. Warranty covers one replacement or credit solely at our discretion. Warranty determinations are at our sole discretion.

In addition to the above conditions, see special notes for these products:

Ring & Pinion - Warrantied against manufacturing defects. 2 years from date of purchase. Must provide set-up specs.

Chromoly front Axles, Excalibur Joints, 30/30 Birfield kits - Warrantied against manufacturing defects for the life of the vehicle. These products are also covered for Breakage. The Shaft / joint must be BROKEN. Wear, twisting, bending are not warrantable. Damages caused by failure of other parts are not warrantable, for example broken U-joint (other than Nitro Excalibur) causing damage to Axle ears.

Rear Chromoly Axles - Warrantied against manufacturing defects for 5 years. These products are also covered for Breakage. The Shaft must be BROKEN. Worn, twisted, or bent axles are not warrantable.


This product can expose you to chemicals including toluene and benzene, which are known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information go to:


Box Weight: 19.25 lb

Box Dimensions: 1 x 1 x 1 in

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