Nitro Gear & Axle, 275mm, 3.73 Ratio with Diesel Engine for use for Ford F-250/F-350 2017-2021

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Nitro Gear & Axle 275mm 3.73 Ratio for use with Spicer AdvanTEK

Spicer AdvanTEK differential assemblies have demonstrated themselves extremely reliable on trucks running stock tire sizes devoid of any upgraded power output. Most of these Spicer AdvanTEK differentials came equipped from the factory with a 3.31 ratio, projected to have a proper run out with a stock size tire, 32"�/275-65R-18 size. If considering upgrading to a 37" or larger tire, there will be an RPM vs. speed confliction, generating a disruption of the shift pattern on trucks equipped with an automatic transmission. Aimed at those individuals that mandate the considerable need for power increases and larger tires, there is an opportunity for enhancement to improve the dependability and performance that is affordable. Look no further, one of the best improvements we can endorse for that increased tire size is that of a Nitro ring and pinion ratio upgrade.

Nitro Gear & Axle strives to provide the highest quality differential 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. Nitro gears are manufactured from 8620 steel gear forgings in the same manufacturing facilities as GM, Dodge, Ford & Toyota. They are precision machined using computer controlled processes, heat treated, CNC triple-lapped and Rockwell tested for hardness. These extra steps ensure excellent fitment, ideal contact pattern and smooth, quiet operation.

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


Differential: Spicer AdvanTEK

Gear Ratio: 3.73

Tooth Count: 41/11

Pinion Splines: 32

Ring Gear Bolts: 14 (not included)

Manufacturer: Nitro Gear & Axle

Warranty: 2 Years


2017 & Newer F250/F350 SRW with 6.7L V8 Diesel


*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: 28 lb

Box Dimensions: 1 x 1 x 1 in

Shopper Approved Review

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