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Motive Gear GM12-308 Differential Ring and Pinion Set 3.08 Ratio GM 8.875" 12-Bolt

(GMC G2500 1979-87, K1500 1979-86, C1500 1979-86, Jimmy 1970-82, C15/C1500 Pickup 1967-74, C2500 1979-81, K1500 Suburban 1979-86 + 76 more models)

Part of: Motive Gear Differential Ring and Pinion Gear Sets

Other options in this family: Motive Gear D60-410 Motive Gear D35-355 Motive Gear D35-456 Motive Gear GM10-5-373 Motive Gear GM10-373A

Manufacturer

Picture for manufacturer Motive Gear

Part Number

GM12-308
6 reviews
Sale Price

$293.02

1 left at this price

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Product Details

The Motive Gear GM12-308 is a 3.08 ratio differential ring and pinion set designed for GM 8.875-inch 12-bolt truck rear axles. Manufactured from 8620 steel and heat treated for maximum durability, this set is engineered to meet or exceed OEM specifications while delivering the strength and precision demanded by both daily drivers and performance builds.

Key Specifications:

  • Gear Ratio: 3.08:1
  • Ring Gear Diameter: 8.875 in. (225.4 mm)
  • Ring Gear Tooth Count: 40
  • Pinion Tooth Count: 13
  • Pinion Spline Count: 30
  • Pinion Shaft Diameter: 1.438 in. (36.5 mm)
  • Ring Gear Bolt Count: 12
  • Carrier Break: 2.76 to 3.42
  • Material: 8620 Steel, Heat Treated
  • Axle Type: GM 8.875 in. 12-Bolt Truck
  • Sold as: Matched Set (Ring and Pinion)

Cross-Reference Part Numbers: Yukon Gear YG GM12T-308, SVL 10001328, Richmond 49-0068-1

Motive Gear ring and pinion sets undergo rigorous in-house quality control testing for strength, tolerance, and hardness. Each set is precision-manufactured to ensure smooth, quiet operation and easy setup for experienced and first-time installers alike. Backed by a 1-year or 50,000-mile warranty.

Products specifications

Fits

GMC G2500 1979-87, K1500 1979-86, C1500 1979-86, Jimmy 1970-82, C15/C1500 Pickup 1967-74, C2500 1979-81, K1500 Suburban 1979-86, G25/G2500 Van 1967-74, C1500 Suburban 1979-86, K15/K1500 Pickup 1966-74, C25/C2500 Pickup 1969-74 + 72 more models

Pinion Spline Count

30

Ring Gear Rotation

Standard

Ring Gear Tooth Quantity

40

Pinion Shaft Diameter

1.438

Cover Bolt Quantity

12

Ring Gear Bolt Quantity

12

Pinion Gear Tooth Quantity

13

Differential Carrier Break

2.76 to 3.42

Ring and Pinion Gear Ratio

3.08

Ring Gear Diameter

8.875

Ring Gear Material

8620 Steel

Prop 65

Cancer and Reproductive Harm - www.P65Warnings.ca.gov
WARNING: Cancer - www.p65warnings.ca.gov

Differential Case Design Type

GM 8.875 Truck

Position

Rear

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It's fast, easy at a great price!!!

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Ordering was very easy, and the part shipped right away. Will use autoplicity again without a doubt.

Shipping was fast and without damage and the price was great.

Good prices and easy ordering process (order #18003). The only issue that I had was after placing the order, completing the entire process, I received three emails stating that "We noticed that you started checking out on our site, but didn't quite finish the process". After calling customer service, they ensured me that the order was complete. Since then, I receive the same email(3 emails at a time) on a daily basis. Just a little annoying, but easy enough to delete.

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