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PartsTable / COMPONENT / 3981940
3981940 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

RESISTOR,VARIABLE,WIRE WOUND,NON. Key specifications include material: STEEL LOCATION NOT OTHERWISE SPECIFIED, body_shape: ROUND, design_type: DRY, coolant_type: AIR, inlet_location: LOCATED IN CENTER OF END SECTION, muffler_design: STRAIGHT THROUGH. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2990-00-991-3657, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
3981940
NSN: 2990-00-991-3657
FSC: 2990
CAGE: 11862 — GENERAL MOTORS CORP CHEVROLET MOTOR DIV SPECIAL PRODUCTS DEPT (USA)
SPECIFICATIONS
materialSTEEL LOCATION NOT OTHERWISE SPECIFIED
body_shapeROUND
design_typeDRY
coolant_typeAIR
inlet_locationLOCATED IN CENTER OF END SECTION
muffler_designSTRAIGHT THROUGH
overall_length26.500 INCHES NOMINAL IN
outlet_locationLOCATED IN CENTER OF END SECTION OPPOSITE INLET
overall_diameter5.000 INCHES NOMINAL IN
surface_treatmentZINC
operating_positionHORIZONTAL
inlet_connection_typeUNTHREADED SINGLE INLET
NSN2990-00-991-3657
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RESISTOR,VARIABLE,WIRE WOUND,NON TITLE COMPONENT PN 3981940 MFR RESISTOR,VARIABLE,WIRE
KEY FEATURES
•
OPERATING POSITION: HORIZONTAL
•
OUTLET INSIDE DIAMETER: 1.687 INCHES NOMINAL FIRST OUTLET IN
•
DESIGN TYPE: DRY
•
INLET CONNECTION TYPE: UNTHREADED SINGLE INLET
•
COOLANT TYPE: AIR
•
MUFFLER DESIGN: STRAIGHT THROUGH
•
INLET PROJECTION LENGTH: 2.250 INCHES NOMINAL SINGLE INLET IN
•
OUTLET PROJECTION LENGTH: 2.250 INCHES NOMINAL FIRST OUTLET IN
TECHNICAL CHARACTERISTICS (FLIS)
OPERATING POSITIONHORIZONTAL
OUTLET INSIDE DIAMETER1.687 INCHES NOMINAL FIRST OUTLET IN
DESIGN TYPEDRY
INLET CONNECTION TYPEUNTHREADED SINGLE INLET
COOLANT TYPEAIR
MUFFLER DESIGNSTRAIGHT THROUGH
INLET PROJECTION LENGTH2.250 INCHES NOMINAL SINGLE INLET IN
OUTLET PROJECTION LENGTH2.250 INCHES NOMINAL FIRST OUTLET IN
BODY SHAPEROUND
INLET INSIDE DIAMETER2.000 INCHES NOMINAL SINGLE INLET IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
101901Interchangeable
interchangeable cross-reference
interchangeable
GK500AF6Interchangeable
interchangeable cross-reference
interchangeable
2420-1400G3Interchangeable
interchangeable cross-reference
interchangeable
21028Interchangeable
interchangeable cross-reference
interchangeable
7-69-219Interchangeable
interchangeable cross-reference
interchangeable
A5594Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3981940?
3981940 is a RESISTOR,VARIABLE,WIRE WOUND,NON.
What parts can replace 3981940?
There are 18 known substitutes for 3981940: 101901, GK500AF6, 2420-1400G3 and 15 more. Substitute compatibility should be verified for your specific system.
Is 3981940 still available?
3981940 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026