Nitro Gear & Axle 8.5" & 8.6" 3.08 Ring & Pinion

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GM 8.5" & 8.6" 10 Bolt 3.08 Nitro Ring & Pinion

Tech Note:

Nitro 8.5/8.6 gears work on both GM 8.5" and GM 8.6" Differentials.

For 8.5" use MKGM8.5

For 1999-2008 8.6" use MKGM8.6

For 2009-2014 8.6" use MKGM8.6-B

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 8.5" & 8.6" 10 Bolt

Gear Ratio: 3.08

Tooth Count: 40/13

Pinion Splines: 27

Ring Gear Bolts: 10 (not included)

Manufacturer: Nitro Gear & Axle

Warranty: 2 Years


1973-1977 Buick Regal

1973-1977 Buick Apollo

1973-1977 Buick Century

1984-1987 Buick Regal Grand National & GNX

1970-1981 Chevrolet Camaro

1970-1973 Chevrolet Chevelle

1973-1977 Chevrolet Malibu

1973-1977 Chevrolet Monte Carlo

1970-1975 Chevrolet Nova

1973-1977 Chevrolet El Camino

1971-1996 Chevrolet Caprice

1971-1985 Chevrolet Impala

1994-1996 Chevrolet Impala SS

1970-1981 Pontiac Firebird & T/A

1971-1977 Pontiac Ventura

1996-2010 Chevrolet Express 1500 Van

1975-1995 GMC Vandura G10 G20 Van

1996-2010 GMC Savana 1500 Van

1980-1987 Chevrolet & GMC C10 K10 Pickup

1988-1998 Chevrolet & GMC C1500 (2wd only)

1999-2010 Chevrolet Silverado 1500 (Not HD or 4x4)

1999-2010 GMC Sierra 1500 (Not HD or 4x4)

1980-1991 Chevrolet K5 Blazer 2wd or 4wd

1980-1991 GMC K5 Jimmy 2wd or 4wd

1980-1991 Chevrolet Suburban 1500 2wd or 4wd


*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: 18 lb

Box Dimensions: 1 x 1 x 1 in

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