Nitro Ring & Pinion GM 8.875" 12 Bolt, 12T, 5.13 Ratio, for Chevrolet & GMC 1965-1981

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GM 8.875" 12 Bolt - Truck 5.13 Nitro Ring & Pinion

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.


Differential: GM 8-7/8" 12 Bolt - Truck

Gear Ratio: 5.13

Tooth Count: 41/8

Pinion Splines: 30

Ring Gear Bolts: 12 (not included)

Manufacturer: Nitro Gear & Axle

Warranty: 2 Years


1965-1981 Chevy C10 & K10 Pickup

1965-1981 GMC C10 & K10 Pickup

1967-1981 Chevy & GMC Suburban

1969-1981 Chevy K5 Blazer

1970-1981 GMC K5 Jimmy

1971-1981 Chevy

GMC G10 G20 Van Vandura


*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: 15 lb

Box Dimensions: 1 x 1 x 1 in

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