Nitro Gear & Axle 5.38 Thick Ring & Big Pinion Kit for Dana 44BP

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5.38 Nitro Ring & Pinion Kit for Dana 44

Nitro's Big Pinion conversion kit for Dana 44 offers you a significant increase in strength over your typical Dana 44 axle with the later “New Generation" type gears used in 2007 & newer Jeep Wrangler JK axles.

The difference:

Larger 24 spline (Dana 60 sized!) Pinion shaft which measures 1.25" vs. standard 26 spline shaft which measures 1.11"

Larger 8.875" diameter ring gear vs Standard 8.5" ring gear

Nitro "Big Pinion Kit" Includes:

Ring, pinion, pinion bearings, seal, nut, solid spacer, shims, bearing spacer and ring gear bolts.)

1310 or 1350 series pinion yoke.

Tech Note:

This is an aftermarket upgrade kit, clearance grinding on the housing will be required.

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.


  • Fits most “Traditional” type standard “low pinion” Dana 44
  • Includes ring, pinion, pinion bearings, seal, nut, solid spacer, shims, bearing spacer and ring gear bolts.
  • Your choice of 1310 or 1350 series pinion yoke.
  • Larger


Differential: Dana Spicer Model 44

Gear Ratio: 5.38

Tooth Count: 43/8

Pinion Splines: 24 Large Spline

Ring Gear Bolts: 10 (included)

Manufacturer: Nitro Gear & Axle

Warranty: 2 Years


Some Common Vehicle Applications:

1967-1980 Chevy/GMC K5 Blazer/Jimmy Front

1967-1980 Chevy & GMC Suburban 4x4 Front

1967-1980 Chevy & GMC K10 K20 4x4 Pickup Front

1967-2001 Dodge W100 W150 W1500 4x4 Pickup Front

1967-1997 Dodge W200 W250 W2500 4x4 Pickup (Not Cummins or V10) Front

1974-1993 Dodge Ramcharger Front

1974-1981 Plymouth Trailduster Front

1948-1979 Ford F100 F150 Rearend

1967-1976 Ford F150 4x4 Front

1967-1977 Ford F250 4x4 Front

1972-1977 Ford Bronco Front

1971-1980 IHC Scout II, Traveler, & Terra

1970-1986 Jeep J10 J20 Pickup

1974-1985 Jeep Wagoneer

1975-1985 Jeep Cherokee FSJ

1986-1992 Jeep Grand Wagoneer

1967-1975 Jeep CJ5

1986 Jeep CJ7

1986-1992 Jeep Comanche MJ Metric Ton

1987-1990 Jeep Cherokee XJ

1997-2006 Jeep Wrangler TJ

2003-2006 Jeep Wrangler Rubicon TJ

2004-2006 Jeep Wrangler Unlimited LJ

2005-2006 Jeep Wrangler Unlimited Rubicon LJ

1965-1968 Sunbeam Tiger


*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: 18 lb

Box Dimensions: 1 x 1 x 1 in

Shopper Approved Review

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