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Richmond Gear 4900721 Ring and Pinion Set 3.73 Ratio GM 12-Bolt Truck

(GMC G2500 1979-81, K1500 1979-82, C1500 1979-82, Jimmy 1970-81, C15/C1500 Pickup 1967-74, 1979-81, C2500 1979-81, K1500 Suburban 1979-82 + 56 more models)

Part of: Richmond Gear Excel Differential Ring and Pinion Set

Other options in this family: Richmond Gear F9411 Richmond Gear F88410 Richmond Gear 4900391 Richmond Gear 12BC373T Richmond Gear 6903041

Manufacturer

Picture for manufacturer Richmond Gear

Part Number

4900721
5 reviews
Sale Price

$329.31

2 left at this price

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Usually delivered within 2 days

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Product Details

The Richmond Gear 49-0072-1 is a high-performance ring and pinion set designed specifically for GM 8.875-inch (12-bolt) truck differentials with a 3 Series carrier. This precision-engineered gear set features a 3.73:1 ratio with 41 ring gear teeth and 11 pinion gear teeth, providing an excellent balance of acceleration and fuel economy for street applications.

Key Features:

  • 3.73:1 gear ratio for improved acceleration and performance
  • Fits GM 8.875-inch (12-bolt) truck axles with 3 Series carrier
  • 30-spline pinion shaft for reliable power transfer
  • Ring gear diameter: 8-7/8 inches
  • Ground pinion threads for trouble-free installation
  • Computer-controlled manufacturing with precision to 1/1000th of an inch
  • Special heat treatment for improved strength and durability
  • 8620 steel construction for maximum reliability

Richmond Gear has been the trusted choice of professional racers for over 80 years, with their Double Diamond symbol representing the highest quality gears in the industry. Each gear set is manufactured using state-of-the-art CNC machining and undergoes extensive testing to ensure it meets or exceeds OEM specifications. This Street Gear set is engineered for reliable street performance and is compatible with 3.42:1 ratio and numerically lower original equipment.

Products specifications

Fits

GMC G2500 1979-81, K1500 1979-82, C1500 1979-82, Jimmy 1970-81, C15/C1500 Pickup 1967-74, 1979-81, C2500 1979-81, K1500 Suburban 1979-82, G25/G2500 Van 1967-81, C1500 Suburban 1979-81, K15/K1500 Pickup 1966-74 + 53 more models

Calculator

Gear Ratio Calculator

Carrier Series

3

Cover Bolts

12

Installation Kit Included

No

Notes

Fits 3.40 ratio and numerically lower

Pinion Gear Teeth

11

Pinion Shaft Diameter (in)

1.438 in.

Pinion Spline Count

30

Quantity

Sold as a set.

Ring and Pinion Ratio

3.73:1

Ring Gear Bolts

12

Ring Gear Diameter (in)

8.875 in.

Ring Gear Rotation

Standard

Ring Gear Teeth

41

Tool

Transmission Lookup

Ring Gear Material

8620 Steel

Ring Gear Tooth Quantity

41

Ring Gear Diameter

8.875

Ring Gear Bolt Quantity

12

Pinion Gear Tooth Quantity

11

Ring and Pinion Gear Ratio

3.73

Differential Carrier Break

3.40 and Lower

Cover Bolt Quantity

12

Pinion Shaft Diameter

1.438

Differential Case Design Type

GM 8.875 Truck

Position

Rear

Prop 65

WARNING: Cancer - www.p65warnings.ca.gov

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Order several parts from Autoplicity for much less than the price I could find on any other site. With 3 days the first part was delivered to my door.<br><br>Excellent price and fast delivery time!

Found autoplicity using google shop. You had the lowest price so I decided to try it out. I havent heard of autoplicity otherwise, so far i'm impressed.

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