Description
A4491 – MANUAL TRANSMISSION SELECTOR VALVE
PART NUMBER(S):
Fleet Products: A4491-G | OE: A4491, 490694C91, 36940 | Automann: 174.4491
DESCRIPTION:
Model: Manual Transmission Range/Selector Valve
Vehicles: Eaton Fuller, Mack, Navistar, Volvo, Ford heavy-duty truck transmissions
• Valve Type: 2-position manual transmission selector valve (air shift knob type)
• Function: Regulates range selection or auxiliary function in manual transmission systems
• Actuation Type: Manual (air shift knob)
• Port Size: All ports 1/16"-27 NPT (0.0625" thread diameter)
• Positions: 2-position toggle/select
• Mounting: Knob/console mount within driver cab
• Thread Type: NPT
• Construction: Chrome-finish housing (in some OEM variants), compact for in-cab mounting
• Unique Features:
– Compact, in-dash mountable design
– Used in range or auxiliary splitter selection
– Compatible with legacy and modern 13-speed and 18-speed gearboxes
• System Fitment: Eaton Fuller, Mack, Navistar/International, Ford, Volvo, and other OEMs using air-actuated manual transmission selectors
Applications:
Used to select high/low or range/split positions in manual transmission systems found in vocational, on-highway, and mixed fleet trucks. Commonly mounted within the gear shift knob assembly in Eaton Fuller and similar systems.
CROSS-REFERENCE(S):
A4491, A-4491, FULA4491, M13A4491, 3088-A4491, 20QE2169AP2, 490694C91, 174.4491, 032402, SM-3723FT, VTC-4945, DMA4491, 3694, 36940, 3088A4491, 455-5009, 455-5009CD, D8HZ7312C, 401291, A4491NP, A4491P, FUR-A-4491, NSFSA4491, R955A4491N, S-5494, S5494, TDAR955A4491N, TRA4491, TRV4491, LSV-3694, 490694C, 490-694-C, NHD544-5009A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.
IMPORTANT INSTALLATION NOTES:
✔ Mounts directly to in-cab shift knob or selector plate
✔ Ensure 1/16"-27 NPT ports are clean and properly sealed
✔ Check air flow direction when replacing old valve
✔ Confirm function selection matches transmission configuration (range vs. splitter)
✔ Always test operation before putting vehicle in service
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Warranty Information
