Why Upgrade to 37-Inch Tires on Your RAM 2500
RAM’s coil spring rear suspension gives the RAM 2500 a ride quality advantage over leaf-sprung competitors — and that advantage translates directly to how well it handles 37-inch tires. The smoother articulation means your upgraded tires stay planted on uneven terrain, delivering better traction and a more composed ride both on and off the pavement.
At Godspeed Off-Road in Sarasota, Florida, we specialize in building RAM 2500 rigs with 37-inch tires that perform on the trail and turn heads on the street. Every build starts with a conversation about how you use your rig — and ends with a vehicle that exceeds your expectations.
Lift Kit Requirements for 37-Inch Tires on the RAM 2500
The RAM 2500’s solid front axle gives you more straightforward lift options compared to IFS-equipped trucks. You have more room to work with and fewer geometry concerns, which means a cleaner installation and more predictable handling after the upgrade.
We typically recommend a 4 to 6-inch lift for running 37-inch tires on the RAM 2500. At 37 inches, you’re stepping into serious build territory. This upgrade demands quality components and professional installation to ensure your RAM 2500 performs reliably both on the trail and during your daily commute. The investment pays dividends every time you tackle terrain that would stop a lesser rig. The RAM 2500 takes 37-inch tires in stride. The truck’s heavy-duty axles, brakes, and frame were designed to handle serious loads, and that over-engineering pays dividends when running larger tires. A 4 to 6-inch lift with quality shocks turns the 2500 into a rig that can handle any terrain Florida — or anywhere else — can throw at it.
Regearing Your RAM 2500 for 37-Inch Tires
Running 37-inch tires without regearing is one of the most common mistakes we see at our shop. Your RAM 2500 likely came from the factory with 3.73 or 4.10 gears with a solid front axle (AAM 11.5 or equivalent). Those ratios were calibrated for the stock tire diameter — increase that diameter without compensating, and you lose acceleration, towing confidence, and fuel economy while putting unnecessary stress on your transmission.
For 37-inch tires, we recommend 5.13 gears. This ratio restores the mechanical advantage your drivetrain was designed around, keeping RPMs in the sweet spot for both highway cruising and low-speed crawling. Our regearing service includes new ring and pinion sets, fresh carrier bearings, and precision setup with gear marking compound — because a gear install done wrong costs more to fix than doing it right the first time. Learn more about regearing.
Top 37-Inch Tire Brands We Recommend for the RAM 2500
Not all 37-inch tires are created equal. Based on thousands of miles of real-world feedback from our Sarasota builds, here are the brands we trust:
- BFGoodrich KO2 — The gold standard for all-terrain performance. Outstanding sidewall strength, excellent wet and dry traction, and a tread life that justifies the investment.
- Nitto Ridge Grappler — A hybrid all-terrain/mud-terrain that delivers aggressive looks with surprisingly quiet highway manners. One of our most-requested tires for the RAM 2500.
- Toyo Open Country A/T III — Exceptional all-weather capability with a 65,000-mile treadwear warranty. A smart choice for daily-driven rigs that still see trail time on weekends.
- Mickey Thompson Baja Boss A/T — Race-inspired tread design with serious off-road capability. If you want a tire that looks as tough as it performs, this is it.
- Falken Wildpeak A/T3W — Outstanding value without compromising performance. Heat-diffuser technology in the lower sidewall makes this tire remarkably durable in Florida’s heat.
Additional Modifications Worth Considering
Building your RAM 2500 for 37-inch tires is a comprehensive project. Beyond the lift and regear, these modifications are essential for a reliable, well-balanced rig:
At this tire size, brake upgrades move from optional to strongly recommended — larger rotors and upgraded calipers ensure your stopping power keeps pace with the added rotating mass. You’ll want 17×9 or 17×10 wheels with aggressive offset for proper clearance, extended brake lines, a heavy-duty steering stabilizer, and high-quality bump stops. Skid plates, rock sliders, and a reinforced front bumper round out a build at this level.
Frequently Asked Questions
Can I fit 37-inch tires on a stock RAM 2500?
No. Running 37-inch tires on a RAM 2500 requires a 4 to 6-inch lift at minimum, along with several supporting modifications including regearing, brake upgrades, and proper steering geometry correction. This is a comprehensive build that should be planned as a complete package, not pieced together over time.
Do I need to regear my RAM 2500 after installing 37-inch tires?
Yes — regearing is essential when running 37-inch tires. Your RAM 2500’s factory 3.73 or 4.10 gears were calibrated for stock tire diameter. Going to 37 inches without regearing to 5.13 causes sluggish acceleration, transmission hunting, increased drivetrain stress, and reduced fuel economy. The regear investment protects your transmission and makes the truck actually enjoyable to drive. Read our complete regearing guide.
What wheel size works best with 37-inch tires on a RAM 2500?
We typically recommend 17×9-inch wheels with -24 to -44mm offset for 37-inch tires on the RAM 2500. This combination provides proper backspacing for brake caliper clearance while giving you the right stance and preventing tire contact with suspension components. Beadlock-capable wheels are worth considering if you plan to air down significantly on the trail.
How do 37-inch tires affect my RAM 2500’s fuel economy?
Expect a decrease of approximately 2 to 4 MPG compared to stock. The larger, heavier tires create more rolling resistance, and the increased rotational mass requires more energy to accelerate. Regearing to 5.13 helps minimize this impact by keeping your engine in its optimal RPM range. Proper tire inflation and a quality alignment also help maintain the best possible fuel economy with your new setup.
What is the total investment for a 37-inch tire and lift package on my RAM 2500?
Every build is different depending on tire brand, lift kit quality, and what additional modifications your specific RAM 2500 needs. Rather than quoting a generic number, we prefer to discuss your goals and spec the right package for your rig. Call us at (941) 706-0071 for a personalized consultation — we’ll walk through the options and put together a build plan that matches your budget and your vision.
Ready to Run 37-Inch Tires on Your RAM 2500?
At Godspeed Off-Road, we build RAM 2500 rigs that are dialed in — not just bolted on. Every tire and lift package we put together is tailored to your vehicle, your driving style, and how you actually use your rig. We handle everything from the initial consultation through the final alignment, so you drive away with total confidence.
Call us at (941) 706-0071 or stop by the shop at 2858 Clark Road, Sarasota, FL 34231. Let’s talk about your RAM 2500 build.