Timken 3720 Differential Pinion Race
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Timken

Timken 3720 Differential Pinion Race

Brand Timken 3720
Position Front Outer, Rear Inner, Rear Outer, and Front Inner
Width 0.938
Width 23.81
Outside Diameter 3.672
Outside Diameter 93.26
Bearing Cup Radius 0.130
Bearing Cup Radius 3.30
Fits Hummer and Pontiac · 15 vehicles

Tapered roller bearing. Handles radial and axial loads for dependable performance.

Compact design. Delivers durability in a smaller space.

Matched replacement. Replace the cone and cup together for better reliability.

Cross-references Champion Spark Plug 3720, SKF BR3720 and 1112986 for the same application. See all 3.

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Timken 3720 Differential Pinion Race Overview

The Timken 3720 differential pinion race is a tapered roller bearing cup built for driveline and axle service where radial and axial loads must be managed together. It is used in applications such as the Hummer H1 front outer and rear outer positions, as well as the Pontiac Catalina rear inner position.

Key Features

  • Timken tapered roller bearing component for differential pinion service
  • Outside diameter: 3.672 in. (93.26 mm)
  • Width: 0.938 in. (23.81 mm)
  • Bearing cup radius: 0.130 in. (3.30 mm)
  • Built for applications that require load handling in compact bearing space
  • Cross-references SKF BR3720 and Champion Spark Plug 3720

Detailed Product Description

Timken 3720 is a differential pinion race engineered as part of a tapered roller bearing assembly. Timken tapered roller bearing components are known for handling both radial and axial forces, which is important in axle and differential locations where alignment, load control, and durability matter. For service work on a Hummer H1 or Pontiac Catalina, this bearing cup provides the dimensional fit needed for the specified pinion bearing positions.

For reliable driveline repair, the cone and cup should be replaced together. That approach helps restore bearing geometry and supports longer service life in the differential assembly. This part number, 3720, is a direct reference point for technicians and parts buyers looking for a Timken pinion race with the listed dimensions.

Vehicle Fitment

  • Fits 2002-2004 Hummer H1, Front Outer
  • Fits 2006 Hummer H1, Front Outer
  • Fits 2002-2004 Hummer H1, Rear Outer
  • Fits 2006 Hummer H1, Rear Outer
  • Fits 1950-1956 Pontiac Catalina, Rear Inner

Common Repair Uses

  • Restoring differential pinion bearing support after wear or scoring
  • Addressing axle noise caused by a damaged bearing race
  • Correcting rough rotation or looseness in the pinion bearing area
  • Replacing a worn cup during differential rebuild service
  • Supporting proper load transfer in front or rear axle service

Installation Notes and Tips

Inspect the matching cone and replace both bearing components at the same time. Verify the bearing seat, race surface, and pinion setup before assembly, and confirm the dimensions match the original application. Proper installation and preload adjustment are important for differential bearing life.

Quality Assurance

Timken is a recognized global manufacturer of tapered roller bearings, and this 3720 race follows the dimensional and load-handling requirements associated with differential service parts. Use the listed fitment and measurements to confirm application before installation.

This part fits 15 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelDrive TypePositionNotes
2006HummerH14WDFront Outer—
2006HummerH14WDRear Outer—
2004HummerH14WDFront Outer—
2004HummerH14WDRear Outer—
2003HummerH14WDFront Outer—
2003HummerH14WDRear Outer—
2002HummerH14WDFront Outer—
2002HummerH14WDRear Outer—
1956PontiacCatalina—Rear Inner—
1955PontiacCatalina—Rear Inner—
1954PontiacCatalina—Rear Inner—
1953PontiacCatalina—Rear Inner—
1952PontiacCatalina—Rear Inner—
1951PontiacCatalina—Rear Inner—
1950PontiacCatalina—Rear Inner—
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Champion Spark Plug — 3720SKF — BR37201112986