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Flywheel Ring Gear Compatible With White 8410 1975-1995 Cummins Gasoline Engine Conversions (4B3.9)

C3901774A6
OEM PART NUMBERS:
• Cummins: 3901774 (Primary OEM part number)

SPECIFICATIONS:
• Teeth Count: 159
• Gear Type: Flywheel Ring Gear
• Position: Flywheel
• Engine Family: B-Series / ISB
• Displacement: 3.9L
• Condition: New

APPLICATION:
• Compatible with Cummins 4B3.9/4BT/B4.5 (1983-1998)
• Compatible with Cummins 6B5.9/6BT (1989-1998)
• Compatible with Cummins ISB6.7 (1998-2026)
• Compatible with White 60/80/100/120 (1975-1995)

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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Description

CUMMINS:
• Cummins 4B3.9/4BT/B4.5 4BT 3.9L (1983-1998)
• Cummins 6B5.9/6BT 6BT 5.9L (1989-1998)
• Cummins ISB6.7 ISB 6.7L (1998-2026)

WHITE:
• White 60/80/100/120 Cummins gasoline engine conversions (1975-1995)
• White 125/140/145/6124 Cummins gasoline engine conversions (1975-1995)
• White 6125/6144/6145/8310 Cummins gasoline engine conversions (1975-1995)
• White 8410 Cummins gasoline engine conversions (1975-1995)


IMPORTANT:
159-tooth flywheel ring gear for Cummins B-Series and ISB engines. Fits 4BT (3.9L), 6BT (5.9L), ISB 6.7, and B4.5 variants. Do NOT confuse with 127T (3905427), 138T (3902127/3908546), or 173T (3903309) — Cummins uses four different tooth counts. Count teeth on your existing ring gear before ordering.

Used in White tractor conversions, industrial/agricultural equipment, and medium-duty trucks. Also fits ISB 6.7L (1998-2026). Starter grinding or no-engagement typically indicates ring gear tooth damage — inspect teeth in the starter engagement zone. Follow engine service manual for installation procedure.

⚠️ 159T variant. Four Cummins counts: 127/138/159/173. Count existing teeth.

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  • Item Requires Shipping
  • 3.5 lbs.
  • W8.0000” x H4.0000” x L8.0000”
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