Keep a hardworking truck's rear end planted with the Monroe Gas-Magnum Rear Suspension Shock Absorber (MPN 34811). Engineered for full-size trucks and vans, it drops in as a direct-fit rear replacement for the 2014-2018 Chevrolet Silverado 2500; the 2011-2024 Chevrolet Silverado 2500 HD and 3500 HD; and the 2011-2024 GMC Sierra 2500 HD and 3500 HD (see the Buyer's Guide tab for engine-level fitment). A shock damps suspension movement to help maintain tire-to-road contact and control body motion — worn units may show bouncing, nose dive, or excessive body sway.
- Firm control: Full-displaced valving on the compression cycle is designed to deliver controlled ride and handling without a harsh feel, with up to twice the fluid capacity of standard 1-in. bore shocks.
- Built to last: A sintered iron piston and self-lubricating fluid seal reduce friction against the piston rod; non-dust-shield units add a heavy-duty nitrocarburized rod.
- Consistent ride: OE all-weather fluid uses special modifiers to handle temperature extremes and help keep rod reaction smooth.
- Nitrogen gas-charge: Helps maintain tire-to-road contact by reducing aeration and shock fade.
A larger bore and bigger 2-in. reserve tube hold more oil for greater capacity. Backed by Monroe's Limited Lifetime Warranty and Feel the Difference Guarantee.
Frequently Asked Questions
What position does this shock fit?
It is a rear suspension shock absorber for the listed trucks. Replace both rear shocks together as a matched pair for balanced, even ride control.
Which vehicles does the Monroe 34811 fit?
The 2014-2018 Chevrolet Silverado 2500; 2011-2024 Silverado 2500 HD and 3500 HD; and 2011-2024 GMC Sierra 2500 HD and 3500 HD. Check the Buyer's Guide tab to confirm your vehicle.
What does a shock absorber do?
It damps suspension movement to help control body motion and maintain tire-to-road contact. Nitrogen gas-charging is designed to reduce aeration and shock fade.
What are signs my rear shocks may need replacing?
Excessive bouncing, nose dive under braking, body sway, or a loose, wallowing ride can indicate worn shocks. Have the suspension inspected to confirm the cause before replacing.
Is this shock covered by a warranty?
Yes. It comes with Monroe's Limited Lifetime Warranty and the exclusive Feel the Difference Guarantee.
Write a Review