Home / Shop / USA Standard Gear Ring and Pinion Sets ZG GM55P-373 & gear set for GM Chevy 55P in a 3.73 ratio

USA Standard Gear Ring and Pinion Sets ZG GM55P-373 & gear set for GM Chevy 55P in a 3.73 ratio

SKU: SPZGM55P-373

Ring and Pinion Gears

USA Standard Gear Ring and Pinion Sets ZG GM55P-373 & gear set for GM Chevy 55P in a 3.73 ratio

SKU: SPZGM55P-373

Ring and Pinion Gears

Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.

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Description

USA Standard Gear ring and pinion sets are high-quality and precision-machined replacements. They're offered for a wide variety of common and hard-to-find applications, differential case designs, and ratios. The right choice adds confidence to your install; select the USA Standard ring and pinion set recommended for your vehicle.

Part Type

Ring and Pinion Gears

Data: v4.2 - Upd: 2026-09-30 16:58:09

Specifications

Product Attributes - Brand: USA Standard Gear
Product Attributes - Manufacturer's Part Number: ZG GM55P-373
Product Attributes - Part Type: Ring and Pinion Gears
Product Attributes - Product Line: USA Standard Gear Ring and Pinion Sets
Product Attributes - UPC: 883584361916
Product Attributes - Differential Case Design Type: GM 55P (8.2 in. Drop out)
Product Attributes - Ring and Pinion Ratio: 3.73:1
Product Attributes - Ring Gear Bolts: 10
Product Attributes - Pinion Spline Count: 17
Product Attributes - Ring Gear Rotation: Standard
Product Attributes - Ring Gear Teeth: 39
Product Attributes - Pinion Gear Teeth: 11
Product Attributes - Ring Gear Diameter (in.): 8.200 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 - Notes: Designed to fit 1955-64 passenger cars.

Reference Information

Brand Name/s	Usa Standard Gear
StreetFX SKU	spzGM55P-373
SFX Item ID	4898501
Supplier Item Code	4898501
Manufacturer SKU	GM55P-373
Manufacturer UPC	883584361916
Alternative References	SPZ-36191, 55P

Compatibility

Application Data

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1958
Ending Year	1961
Engine Type	V8
Engine Size	5.7L/348
Engine Family	Chevy big block W-engines
Axle Location	Rear
Liter	5.7
CID	348
CC	5704
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1958
Ending Year	1962
Engine Type	L6
Engine Size	3.8L/235
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.8
CID	235
CC	3852
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1958
Ending Year	1964
Engine Type	V8
Engine Size	4.6L/283
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	4.6
CID	283
CC	4638
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1959
Ending Year	1959
Engine Type	V8
Engine Size	5.3L/322
Engine Family	Buick V8
Axle Location	Rear
Liter	5.3
CID	322
CC	5272
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1959
Ending Year	1960
Engine Type	L6
Engine Size	4.3L/261
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	4.3
CID	261
CC	4278
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1960
Ending Year	1960
Engine Type	L6
Engine Size	3.9L/236
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.9
CID	236
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1961
Ending Year	1964
Engine Type	V8
Engine Size	6.7L/409
Engine Family	Chevy big block W-engines
Axle Location	Rear
Liter	6.7
CID	409
CC	6704
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1962
Ending Year	1964
Engine Type	V8
Engine Size	5.3L/327
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.3
CID	327
CC	5358
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1963
Ending Year	1963
Engine Type	V8
Engine Size	7.0L/427
Engine Family	Chevy big block W-engines
Axle Location	Rear
Liter	7.0
CID	427
CC	6997
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1963
Ending Year	1964
Engine Type	L6
Engine Size	3.8L/230
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.8
CID	230
CC	3769
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1958
Ending Year	1961
Engine Type	V8
Engine Size	5.7L/348
Engine Family	Chevy big block W-engines
Axle Location	Rear
Liter	5.7
CID	348
CC	5704
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1958
Ending Year	1962
Engine Type	L6
Engine Size	3.8L/235
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.8
CID	235
CC	3852
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1958
Ending Year	1964
Engine Type	V8
Engine Size	4.6L/283
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	4.6
CID	283
CC	4638
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1960
Ending Year	1960
Engine Type	L6
Engine Size	3.9L/236
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.9
CID	236
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1961
Ending Year	1964
Engine Type	V8
Engine Size	6.7L/409
Engine Family	Chevy big block W-engines
Axle Location	Rear
Liter	6.7
CID	409
CC	6704
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1962
Ending Year	1964
Engine Type	V8
Engine Size	5.3L/327
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	5.3
CID	327
CC	5358
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1963
Ending Year	1963
Engine Type	V8
Engine Size	7.0L/427
Engine Family	Chevy big block W-engines
Axle Location	Rear
Liter	7.0
CID	427
CC	6997
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1963
Ending Year	1964
Engine Type	L6
Engine Size	3.8L/230
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.8
CID	230
CC	3769
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	FLEETMASTER
Beginning Year	1960
Ending Year	1960
Engine Type	L6
Engine Size	3.9L/236
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.9
CID	236
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	FLEETMASTER
Beginning Year	1960
Ending Year	1960
Engine Type	V8
Engine Size	4.6L/283
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	4.6
CID	283
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	BISCAYNE
Submodel	FLEETMASTER
Beginning Year	1960
Ending Year	1960
Engine Type	V8
Engine Size	5.7L/348
Engine Family	Chevy big block W-engines
Axle Location	Rear
Liter	5.7
CID	348
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	CHEVY II
Submodel	BASE
Beginning Year	1962
Ending Year	1964
Engine Type	L4
Engine Size	2.5L/153
Engine Family	GM 4-cylinder
Axle Location	Rear
Liter	2.5
CID	153
CC	2507
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	CHEVY II
Submodel	BASE
Beginning Year	1962
Ending Year	1964
Engine Type	L6
Engine Size	3.2L/194
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.2
CID	194
CC	3180
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	CHEVY II
Submodel	BASE
Beginning Year	1963
Ending Year	1964
Engine Type	V8
Engine Size	4.6L/283
Engine Family	Chevy small block Gen I
Axle Location	Rear
Liter	4.6
CID	283
CC	4638
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

Make	CHEVROLET
Model	CHEVY II
Submodel	BASE
Beginning Year	1964
Ending Year	1964
Engine Type	L6
Engine Size	3.8L/230
Engine Family	GM inline 6-cylinder
Axle Location	Rear
Liter	3.8
CID	230
CC	3769
Application Notes	GM 55-64 Passenger car; 3.73 Ratio; Not Compatible w/Factory 3.08 Carrier

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USA Standard Gear Ring and Pinion Sets ZG GM55P-373 & gear set for GM Chevy 55P in a 3.73 ratio

USA Standard Gear Ring and Pinion Sets ZG GM55P-373 & gear set for GM Chevy 55P in a 3.73 ratio

Description

Part Type

Specifications

Reference Information

Compatibility

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