Nitro Gear & Axle D100 9.25" Lunch Box Locker 31 Spline for Plymouth & Dodge 1974-2011

Price $583.00
This Item is eligible for free delivery
accept payment


Chrysler 9.25" Nitro Lunch Box Locker - Automatic Locking Differential

Recommended: 3 quarts of Nitro Synthetic Plus Gear Lube

Pack your Lunchbox with Nitro

Travel where you want without breaking the bank, or your vehicle.

Nitro Lunchbox Lockers are TOUGH - RELIABLE - AFFORDABLE. Not everyone needs or wants a selectable locker - Let Nitro Gear & Axle mechanical lockers upgrade your currently open differential! When it comes to performance & strength in an auto (mechanical) locker, our Lunchbox Locker units set the new standard.

Tech Note:

Picture is of a generic LunchBox Locker, parts included may vary depending on application.

LunchBox Lockers replace the internal spider gears of an open differential only, will not work inside limited slip carriers. Open, empty carrier cases sold separately.

Use Replacement Spring Kit LBSPRING-SML For Maintenance.

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.




Differential: Chrysler 9.25" -12 bolt

Axle Splines: 31

Manufacturer: Nitro Gear & Axle

Material: 9310 Steel


1974-1993 Dodge Ram D100 D150 W100 W150

1994-2011 Dodge Ram 1500

1974-1981 Plymouth Trailduster

1997-2011 Dodge Dakota

1998-2011 Dodge Durango

1974-1993 Dodge Ramcharger


*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.


Box Weight: 7.1 lb

Box Dimensions: 1 x 1 x 1 in

Shopper Approved Review

Related Products
  • Nitro Ring & Pinion Short 4.88 Ratio for Dana 30 for Jeep 1995-2006
    In stock
    SKU :
    Price $230.00
    * Free Shipping
  • Nitro GM 9.25" IFS 14", Right Hand Front Stub Axle
    In stock
    SKU :
    Price $446.67
    * Free Shipping
  • Nitro Gear Ring & Pinion - 4.56 Gear Ratio
    SKU :
    Price $253.33
    * Free Shipping
  • Nitro Gear & Axle GM 8.5" Rear Axle Shaft
    In stock
    SKU :
    Price $164.44
    * Free Shipping
  • Nitro Ring & Pinion 4.11 Ratio, Reverse High Pinion, Short for Dana 44
    In stock
    SKU :
    Price $353.33
    * Free Shipping
  • Nitro Gear & Axle Standard Open 36 Spline Inner Parts Kit for Dana S135
    In stock
    SKU :
    Price $466.67
    * Free Shipping
  • Nitro Gear & Axle STD Spider Gear Kit Good Take-Out for Toyota 1993-2015
    In stock
    SKU :
    Price $293.33
    * Free Shipping
  • Need Help?

    Contact Us

    To Top