Home / Shop / Richmond Gear Ring and Pinion Sets 49-0072-1 GM 8.875 in. (12-bolt) truck 3.73 Gears Gear, Pinion, 3.73:1 Ratio, GM, 12-Bolt Truck, 3 Series, Set

Richmond Gear Ring and Pinion Sets 49-0072-1 GM 8.875 in. (12-bolt) truck 3.73 Gears Gear, Pinion, 3.73:1 Ratio, GM, 12-Bolt Truck, 3 Series, Set

SKU: RMG4900721

Ring and Pinion Gears

Richmond Gear

Richmond Gear Ring and Pinion Sets 49-0072-1 GM 8.875 in. (12-bolt) truck 3.73 Gears Gear, Pinion, 3.73:1 Ratio, GM, 12-Bolt Truck, 3 Series, Set

SKU: RMG4900721

Ring and Pinion Gears

Sale ends in Calculating... Sat 24 Oct, 1:32 am AEST

LOW STOCK! Est Ship 4-7 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.

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Description

Richmond Gear is the leading manufacturer of professional-quality, high performance ring and pinion sets. The superior quality of these gear sets is the result of years of racing development, outstanding design, and state-of-the-art manufacturing methods. Richmond also offers these gear sets in a lightened version for the weight-conscious enthusiast. Their lightened ring and pinion sets feature an outstanding rotating weight loss of up to 6 lbs., ground pinion threads for trouble-free installation, and a special heat treatment for improved strength.

Part Type

3.73 12 Bolt GM Truck

Data: v4.2 - Upd: 2026-10-23 00:15:56

Specifications

Product Attributes - Brand: Richmond Gear
Product Attributes - Manufacturer's Part Number: 49-0072-1
Product Attributes - Part Type: Ring and Pinion Gears
Product Attributes - Product Line: Richmond Gear Ring and Pinion Sets
Product Attributes - UPC: 698231680223
Product Attributes - Differential Case Design Type: GM 8.875 in. (12-bolt), truck
Product Attributes - Ring and Pinion Ratio: 3.73:1
Product Attributes - Cover Bolts: 12
Product Attributes - Ring Gear Bolts: 12
Product Attributes - Pinion Spline Count: 30
Product Attributes - Carrier Series: 3
Product Attributes - Ring Gear Rotation: Standard
Product Attributes - Ring Gear Teeth: 41
Product Attributes - Pinion Gear Teeth: 11
Product Attributes - Ring Gear Diameter (in.): 8.875 in.
Product Attributes - Pinion Shaft Diameter (in.): 1.438 in.
Product Attributes - Installation Kit Included: No
Product Attributes - Cover Gasket Included: No
Product Attributes - Pinion Shims Included: No
Product Attributes - Carrier Shims Included: No
Product Attributes - Crush Sleeve Included: No
Product Attributes - Pinion Seal Included: No
Product Attributes - Pinion Nut Included: No
Product Attributes - Ring Gear Bolts Included: No
Product Attributes - Head Bearing Included: No
Product Attributes - Tail Bearing Included: No
Product Attributes - Carrier Bearings Included: No
Product Attributes - Axle Seals Included: No
Product Attributes - Axle Bearings Included: No
Product Attributes - Differential Cover Included: No
Product Attributes - Differential Oil Included: No
Product Attributes - Friction Modifier Included: No
Product Attributes - Installation DVD Included: No
Product Attributes - Quantity: Sold as a set.
Product Attributes - Special Attention: Only fits 3.42:1 ratio and numerically lower.

Reference Information

Brand Name/s	Richmond Gear
StreetFX SKU	rmg4900721
SFX Item ID	5500865
Supplier Item Code	5500865
Manufacturer SKU	4900721
Manufacturer UPC	698231680223
Alternative References	RIC49-0072-1, 12-Bolt

Compatibility

Application Data

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1969
Ending Year	1969
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4097
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	P
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1969
Ending Year	1969
Engine Type	V8
Engine Size	5.0L/307
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.0
CID	307
CC	5031
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	E
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1969
Ending Year	1969
Engine Type	V8
Engine Size	5.0L/307
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.0
CID	307
CC	5031
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	U
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1969
Ending Year	1971
Engine Type	L6
Engine Size	4.8L/292
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.8
CID	292
CC	4801
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1969
Ending Year	1972
Engine Type	L6
Engine Size	4.8L/292
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.8
CID	292
CC	4801
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	S
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1969
Ending Year	1972
Engine Type	V8
Engine Size	5.7L/350
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.7
CID	350
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	E
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1970
Ending Year	1970
Engine Type	V8
Engine Size	5.0L/307
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.0
CID	307
CC	5031
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	A
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1970
Ending Year	1970
Engine Type	V8
Engine Size	5.0L/307
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.0
CID	307
CC	5031
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	B
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1970
Ending Year	1971
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4097
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	N
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1970
Ending Year	1971
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4097
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	S
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4097
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	C
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4097
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	L
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	5.0L/307
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.0
CID	307
CC	5031
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	H
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	5.0L/307
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.0
CID	307
CC	5031
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	P
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1972
Ending Year	1972
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4097
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	D
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1972
Ending Year	1972
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4098
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	D
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Engine Size	5.0L/307
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.0
CID	307
CC	5031
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	F
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1972
Ending Year	1974
Engine Type	L6
Engine Size	4.8L/292
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.8
CID	292
CC	4801
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	T
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1973
Ending Year	1973
Engine Type	L6
Engine Size	4.8L/292
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.8
CID	292
CC	4786
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	T
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1973
Ending Year	1973
Engine Type	V8
Engine Size	5.0L/307
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.0
CID	307
CC	5031
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	X
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1973
Ending Year	1973
Engine Type	V8
Engine Size	7.4L/454
Engine Family	Chevy big block Mark IV
Axle Location	Rear
Liter	7.4
CID	454
CC	7441
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	Z
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1973
Ending Year	1974
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4097
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	Q
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1973
Ending Year	1974
Engine Type	L6
Engine Size	4.1L/250
Engine Family	CHEVROLET L6 GAS
Axle Location	Rear
Liter	4.1
CID	250
CC	4098
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	Q
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1973
Ending Year	1974
Engine Type	V8
Engine Size	5.7L/350
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.7
CID	350
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	V
Region	USA

Make	CHEVROLET
Model	BLAZER
Submodel	BASE
Beginning Year	1973
Ending Year	1974
Engine Type	V8
Engine Size	5.7L/350
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.7
CID	350
Application Notes	Differential Ring and Pinion; For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke
Engine VIN Code	Y
Region	USA

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Richmond Gear Ring and Pinion Sets 49-0072-1 GM 8.875 in. (12-bolt) truck 3.73 Gears Gear, Pinion, 3.73:1 Ratio, GM, 12-Bolt Truck, 3 Series, Set

Richmond Gear Ring and Pinion Sets 49-0072-1 GM 8.875 in. (12-bolt) truck 3.73 Gears Gear, Pinion, 3.73:1 Ratio, GM, 12-Bolt Truck, 3 Series, Set

Description

Part Type

Specifications

Reference Information

Compatibility

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