2020 Ram 3500 Bulb Sizes & Tire Sizes
The short answer
The 2020 Ram 3500 uses an H11 low-beam bulb, and came on LT275/70R18 (Single rear wheel), LT285/60R20 (Single rear wheel), LT235/80R17 (Dual rear wheel) depending on trim.
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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Tire sizes by trim
Single rear wheel
LT275/70R18 Search Amazon for LT275/70R18 tires
Single rear wheel
LT285/60R20 Search Amazon for LT285/60R20 tires
Dual rear wheel
LT235/80R17 Search Amazon for LT235/80R17 tires
The size on the placard inside the driver's door jamb is the one your car left the factory with. Match that, not this table, if they differ; a previous owner may have changed wheels.
Bulb sizes
Low beam
H11 Search Amazon for H11 bulbs
High beam
9005 Search Amazon for 9005 bulbs
Fog light
H11 Search Amazon for H11 bulbs
Front turn signal
7444NA Search Amazon for 7444NA bulbs
Rear turn signal
3157K Search Amazon for 3157K bulbs
Brake light
3157K Search Amazon for 3157K bulbs
Tail light
3157K Search Amazon for 3157K bulbs
Reverse light
921 Search Amazon for 921 bulbs
License plate
194 Search Amazon for 194 bulbs
Dome / map light
7679 Search Amazon for 7679 bulbs
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 2020 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.
- Tire chains. The manual permits tire chains or cables of SAE Class U, within limits on which tires and which wheels. Those limits are in the next note; read them before you fit anything. Search Amazon for tire chains →
- Tires. Sizes are the load range E tires in the manual's chain table, not every factory size; U-class chains go on the rear of single-rear-wheel trucks and front and rear of dual-rear-wheel trucks.
- 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.