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Starter Ring Gear Compatible With Various OEM 6B/6B5.9/6Bt 1980-2003 6B 5.9L (Cummins C Series) 173T

C3903309A2
OEM PART NUMBERS:
• Cummins: 3903309 (OEM number for B and C Series engines)

SPECIFICATIONS:
• Teeth Count: 173
• Gear Type: Starter Ring
• Material: Cast Iron
• Position: Flywheel
• Mounting Style: Bolted to Flywheel
• Engine Family: Cummins B Series
• Condition: New

APPLICATION:
• Compatible with Various OEM 4B/4B3.9 (1980-2003)
• Compatible with Various OEM 6B/6B5.9/6BT/6BTA (1980-2003)
• Compatible with Various OEM 6CT/6CTA (1985-2003)

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

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Sale: $105.62
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Description

CUMMINS 4B TRUCK:
• Various OEM 4B/4B3.9 4B 3.9L (1980-2003)

CUMMINS 6B TRUCK:
• Various OEM 6B/6B5.9/6BT/6BTA 6B 5.9L (1980-2003)

CUMMINS 6CT TRUCK:
• Various OEM 6CT/6CTA 6CT 8.3L (1985-2003)


IMPORTANT:
173-tooth starter ring gear for Cummins B-Series and C-Series engines. This is the LARGEST tooth count variant — do NOT confuse with 127T (3905427), 138T (3908546/3902127), or 159T (3901774). Cummins uses four different ring gear sizes. Count teeth on your existing ring gear before ordering.

Fits 4B/4B3.9 (3.9L), 6B/6BT (5.9L), and 6CT (8.3L) engines across multiple OEM truck platforms. The higher tooth count provides finer starter engagement for smoother cranking. Inspect flywheel face for heat checks and scoring when ring gear is removed. Follow engine service manual for installation procedure and specifications.

⚠️ 173T variant (largest). Four Cummins tooth counts: 127/138/159/173. Count first.

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  • 5.0 lbs.
  • W10.0000” x H5.0000” x L10.0000”
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