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Gear Compatible With Cummins 4Bt/6Bt/6B 1983-2000 B Series 3.9L-5.9L Diesel (Cummins 4Bt) 127T Ring

C3905427A1
OEM PART NUMBERS:
• Cummins: 3905427 (Primary OEM number - Genuine Cummins ring gear)

SPECIFICATIONS:
• Teeth Count: 127
• Gear Type: Ring Gear - External
• Material: Cast Iron
• Position: Flywheel
• Width (in): 0.616
• Width (mm): 15.65
• Outer Diameter (mm): 408.0
• Inner Diameter (mm): 359.0
• Mounting Style: Shrink fit on flywheel
• Engine Family: Cummins B Series
• Displacement: 5.9L
• Condition: New

APPLICATION:
• Compatible with Cummins 4BT/6BT/6B/4B (1983-2000)

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: $198.42
Sale: $113.38
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Description

CUMMINS INDUSTRIAL:
• Cummins 4BT/6BT/6B/4B B Series 3.9L-5.9L Diesel (1983-2000)


IMPORTANT:
127-tooth external ring gear for Cummins 4BT/6BT/4B/6B engines (3.9L-5.9L). Do NOT confuse with 138T (3902127), 159T (3901774), or 173T (3903309) variants — Cummins uses FOUR different ring gear tooth counts for the B-Series family. Count teeth on your existing ring gear before ordering.

Used in industrial, agricultural, and medium-duty truck applications. Cast iron construction. Starter grinding or failure to engage typically indicates ring gear tooth damage — a few damaged teeth in the engagement zone is the most common failure mode. Inspect flywheel face for heat checks and scoring when ring gear is removed. Follow engine service manual for installation procedure and torque specifications.

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

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