Firm truck control without a harsh ride starts with the Monroe Gas-Magnum 34686 Front Suspension Shock Absorber. Engineered for hardworking full-size and midsize trucks and vans, it drops in as a direct-fit front shock for the 1999-2004 Ford F-250 Super Duty, F-350 Super Duty, F-450 Super Duty and F-550 Super Duty, the 2002 Ford E-550 Econoline Super Duty, and the 2003 Ford E-550 Super Duty (see the "Vehicles it fits" section for engine-level detail).
- Built for trucks and vans: full-displaced valving on the compression cycle helps deliver controlled ride and handling under load.
- High capacity: a larger bore and bigger 2-in. reserve tube hold more oil — up to twice the fluid of a standard 1-in. bore shock — so it works efficiently with less effort.
- Built to last: a heavy-duty nitrocarburized rod (on non-dust-shield units) and sintered iron piston enhance durability, while a self-lubricating fluid seal reduces friction against the rod.
- Gas-charged: nitrogen gas-charge helps maintain tire-to-road contact by reducing aeration and shock fade; OE all-weather fluid handles temperature extremes for smooth rod reaction.
Backed by Monroe's Limited Lifetime Warranty and Feel the Difference™ Guarantee.
Interchange: 813051 · HD12140650 · TS3431441B · 342501 · 342502 · 2C2Z18124CA · 3U2Z18124BAA · 58455 · 58809 · 77809 · G63809 · 9150701 · 344077 · KG5441 · FD109 · ASH387 · ASH408 · ASHV871 · SH61655 · 76686 · S5441 · RS5267 · RS55267 · 310237 · 12140126
This part cross-references / interchanges with the following part numbers:
813051, HD12140650, TS3431441B, 342501, 342502, 2C2Z18124CA, 3U2Z18124BAA, 58455, 58809, 77809, G63809, 9150701, 344077, KG5441, FD109, ASH387, ASH408, ASHV871, SH61655, 76686, S5441, RS5267, RS55267, 310237, 12140126
Frequently Asked Questions
What vehicles does the Monroe 34686 fit?
It's a front shock for the 1999-2004 Ford F-250, F-350, F-450 and F-550 Super Duty, the 2002 E-550 Econoline Super Duty, and the 2003 E-550 Super Duty. Check the "Vehicles it fits" section for engine detail.
Is this a front or rear shock absorber?
This is a front suspension shock absorber for the listed applications.
What does the nitrogen gas-charge do?
The nitrogen gas-charge helps maintain tire-to-road contact by reducing fluid aeration and shock fade, which supports more consistent ride and handling.
What are signs my front shocks may need replacing?
Excessive bouncing after bumps, nose-dive under braking, poor ride control, or cupped/uneven front tire wear can be signs. Diagnose the cause before replacing.
Should I replace shocks in pairs?
This listing is for one shock. Replacing both sides on the same axle together is recommended for balanced, even ride control.
