If you have installed 37- to 40-inch tires on your Ford Bronco and noticed sluggish acceleration, the transmission hunting between gears, or highway RPMs climbing higher than they should — that is your factory 3.73 or 4.27 gearing telling you it was never designed for this tire size. A 5.13 gear ratio corrects the equation, restoring the torque multiplication your Ford Bronco’s Dana 44 front and rear needs to spin 37- to 40-inch rubber the way the factory intended for stock-diameter tires. At Godspeed Off-Road in Sarasota, Florida, we build precision regear setups for Ford Bronco owners who want their rig to feel as capable on Florida trails as it looks in the parking lot.
Why 5.13 Gears for Your Ford Bronco?
Gear ratio describes how many times the driveshaft rotates for each revolution of the wheels. Your Ford Bronco’s stock 3.73 or 4.27 ratio was calibrated for a specific tire circumference — and the moment you install larger rubber, that calibration breaks. Bigger tires increase the effective rolling circumference, which lowers the overall drive ratio and pushes every shift point, every torque curve, and every fuel map out of its designed operating window. The engine lugs where it used to pull, the transmission downshifts where it used to cruise, and the vehicle feels like it lost significant horsepower overnight.
A 5.13 regear delivers maximum mechanical advantage for the largest tire packages, chosen by Ford Bronco owners who prioritize trail dominance and accept higher highway RPMs for unmatched low-range authority. With Dana 44 front and rear and a two-speed transfer case, your Ford Bronco responds exceptionally well to a 5.13 setup.
Tire Size and 5.13 Gear Ratio Compatibility for the Ford Bronco
5.13 gears on a Ford Bronco are designed to pair with 37 to 40-inch tires. With tires in the 37 to 40-inch range, your Ford Bronco is running serious rubber that demands equally serious gearing. 5.13 restores low-range crawl authority and keeps the engine planted in its power band under load. As a general rule: 33-inch tires pair well with 4.10 or 4.56 gears, 35-inch tires with 4.56 or 4.88, and 37-inch or larger tires with 4.88 or 5.13.
Mismatching tire size and gear ratio is one of the most common build mistakes we see at the shop. Running your Ford Bronco with an undergeared axle and oversized tires leads to premature transmission wear, excessive heat buildup, and a vehicle that never quite feels right. Getting the ratio matched to the tire is the single most important drivetrain decision in any Ford Bronco build.
How 5.13 Gears Transform Your Ford Bronco
The first thing you will notice after a 5.13 regear is how your Ford Bronco responds to the throttle. The hesitation off the line disappears. Merging onto I-75 no longer requires a full-throttle run-up. The transmission finds its gear and stays there instead of constantly hunting. Highway cruising RPMs will sit roughly 200 to 400 RPM higher than with stock gearing, which is noticeable but not uncomfortable. Most Ford Bronco owners tell us the improvement in drivability more than makes up for the slight increase in engine note at cruising speed.
On the trail, the difference is transformative. Low-range torque multiplication increases significantly, giving you finer throttle modulation over obstacles, smoother low-speed hill climbs, and more predictable behavior in technical terrain. Where your Ford Bronco used to struggle for traction at low speed, it now delivers power smoothly and predictably. Whether you use your Ford Bronco for work, adventure, or both, the regear is the modification that ties everything else together.
Who Should Run 5.13 Gears on a Ford Bronco?
5.13 gears are a purpose-built choice for Ford Bronco owners running 37 to 40-inch tires who prioritize maximum off-road capability. This is the ratio you choose when your rig is built for serious trail work — when crawl ratio, throttle control, and low-range authority matter more than highway quiet.
Professional Ford Bronco Regearing at Godspeed Off-Road — Sarasota, FL
At Godspeed Off-Road, regearing is a core specialty — not a side job squeezed between oil changes. Every Ford Bronco regear follows our precision process: we set each ring-and-pinion gear mesh with verified contact patterns, dial bearing preloads to manufacturer specification, and inspect every component for wear before reassembly. We work with Dana 44 front and rear setups regularly and understand the specific tolerances and nuances of each Ford Bronco generation and configuration. Our senior technician brings over two decades of drivetrain experience to every build, and we stand behind our regear work with a workmanship guarantee. When you invest in a regear at Godspeed, you are paying for the job done once and done right.
Ford Bronco 5.13 Gear Ratio — Frequently Asked Questions
How much is a Ford Bronco 5.13 regear investment?
Every Ford Bronco regear is unique — the investment depends on your axle configuration (Dana 44 front and rear), whether both axles are being done, and whether additional components like carrier bearings or pinion seals need replacement. We provide a detailed, no-surprise quote after a quick inspection. Call us at (941) 706-0071 or stop by 2858 Clark Road in Sarasota for your estimate.
What tire size pairs best with 5.13 gears on a Ford Bronco?
5.13 gears are optimized for 37 to 40-inch tires on a Ford Bronco. Running tires significantly outside this range means you are leaving performance on the table or pushing RPMs higher than necessary.
How long does a Ford Bronco regear take at Godspeed Off-Road?
A complete Ford Bronco regear typically takes one to two days. We do not rush gear work — proper ring-and-pinion setup requires contact pattern verification, bearing preload adjustment, and backlash measurement. Cutting corners leads to gear whine, premature wear, and costly failures.
Do I need to regear both axles on my Ford Bronco?
Yes — both axles must run the same gear ratio. Mismatched ratios between front and rear cause driveline binding, vibration, and accelerated wear on your two-speed transfer case. We always do both axles in the same visit.
Will 5.13 gears change my Ford Bronco’s fuel economy?
You may see a decrease of one to two miles per gallon at highway speeds due to slightly higher RPMs. Around town, however, fuel economy often stays the same or improves because the engine no longer has to work as hard to accelerate. For most owners, the drivability improvement far outweighs the marginal fuel difference.
Ready to transform your Ford Bronco? Godspeed Off-Road is Sarasota’s dedicated 4×4 and off-road specialist. Call (941) 706-0071 or visit us at 2858 Clark Road, Sarasota, FL 34231.
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