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Gear Compatible With Hyundai Hyundai 7-Series Crawler Excavators/Hyundai 9-Series Crawler Excavators

C3902127A3
OEM PART NUMBERS:
• Cummins: 3902127 (OEM number for B-Series and C-Series engines)

SPECIFICATIONS:
• Teeth Count: 138
• Gear Type: Flywheel Ring Gear / Starter Ring
• Position: Flywheel
• Mounting Style: Bolted to Flywheel
• Engine Family: B Series / C Series
• Displacement: 5.9L
• Condition: New

APPLICATION:
• Compatible with Dodge 3/4 Ton/1 Ton (1989-1998)
• Compatible with Cummins 6CT/L10/QSL9 (1985-2010)
• Compatible with Hyundai Hyundai 7-Series Crawler Excavators/Hyundai 9-Series Crawler Excavators (1990-2005)

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

Was: $210.84
Sale: $120.48
Save: 43%
Save: $90.36
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Description

DODGE RAM PICKUP:
• Dodge 3/4 Ton/1 Ton Cummins 5.9L 6BT (1989-1998)

CUMMINS C-SERIES INDUSTRIAL:
• Cummins 6CT/L10/QSL9 6CT (8.3L) / ISB Series (1985-2010)

HEAVY EQUIPMENT:
• Hyundai Hyundai 7-Series Crawler Excavators/Hyundai 9-Series Crawler Excavators Cummins 6BT / 6CT (1990-2005)


IMPORTANT:
138-tooth flywheel ring gear for Cummins B-Series AND C-Series engines. Primary application: Dodge Ram 2500/3500 with 6BT 5.9L (1989-1998). Also fits 4BT (3.9L), 6CT/L10/QSL9 (8.3L), and ISB variants. Multiple engine families share this ring gear.

Do NOT confuse with 127T (3905427), 159T (3901774), or 173T (3903309) variants — Cummins uses FOUR different ring gear tooth counts for the B/C-Series. Count teeth on your existing ring gear before ordering — this is the #1 ordering mistake. On Dodge Ram trucks, starter grinding or no-crank conditions usually indicate ring gear tooth damage rather than starter failure. Follow service manual for installation.

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

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  • Item Requires Shipping
  • 5.0 lbs.
  • W10.0000” x H5.0000” x L10.0000”
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