2021 Ram 3500 Bulb Sizes

Last reviewed September 30, 2026

The short answer

The 2021 Ram 3500 uses an H11 low-beam bulb.

Some values on this page are still waiting for a second source. We show what we have and mark it; confirm against your owner's manual before you buy.

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Bulb sizes

Key fob, battery and sensors

Key fob battery CR2450 Search Amazon for CR2450

Dimensions, weight and fuel

Fuel Gasoline
Octane 87 (regular)

Worth knowing about the 2021 3500

  • Bulbs. Codes are for halogen reflector headlamps and base rear lamps; the manual lists long-life H11LL and 9005LL bulbs, and LED headlamp and premium rear lamp packages are sealed.
  • Wheels. Single-rear-wheel trucks take 130 lb-ft on cone nuts per the owner's manual, and dual-rear-wheel trucks take 129 lb-ft on flat-face nuts per Ram recall 21V-398, which corrected the 140 lb-ft printed in the manual.
  • Fuel. The Cummins diesel version runs on ultra-low-sulfur diesel, and tank size depends on cab, bed and engine.