J.C. Whitney JM612901 Rear Liftgate Lift Support OEM Replacement for Mercedes M-Class

The J.C. Whitney JM612901 is a rear liftgate lift support designed as a direct OEM replacement for the Mercedes-Benz M-Class (W163) spanning model years 1998 through 2007. This gas-charged strut replaces the original Mercedes-Benz part number 1637400345 and is engineered to restore proper liftgate function, holding the rear lift gate securely open during loading and unloading.

Key Features:

• Direct replacement for Mercedes-Benz OEM part number 1637400345
• Designed for the rear liftgate position — one strut fits both left and right sides (RH=LH)
• Gas-pressurized design provides consistent, controlled support to hold the liftgate open
• Restores original lift force and open-hold performance to a worn or failed strut
• Bolt-on installation with no modifications required

Over time, factory lift supports lose their internal gas charge, resulting in a liftgate that falls or will not stay open on its own. Replacing the strut with the J.C. Whitney JM612901 restores safe, hands-free access to the cargo area. This part is sold individually; confirm the number of struts needed before ordering.