Ford Regear Calculator
Calculate the optimal gear ratio for your Ford vehicle. Select your specific model below to get started.
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Calculate the optimal gear ratio for your Ford vehicle. Select your specific model below to get started.
Use this Ford Regear Calculator to estimate the effects of different axle gears and tire sizes on speedometer accuracy, vehicle performance, and effective final drive ratios. This tool helps you compare gear options and see how tire changes affect speed and RPM
.Enter your current gear and tire size, then test different targets to compare results. Data is cross-checked against OEM service manuals and technical references; if you find an error, please report it at https://regearcalculator.com/contact.
Ford's solid rear axles have anchored the F-150 and Super Duty lineup for decades, with the 8.8" and 9.75" ring gears serving half-ton trucks and Broncos. Verified factory ratio options on recent F-150s are 3.15, 3.31, 3.55, and 3.73 — 3.31 pairs with the FX4 package, while 3.73 is the Max Tow ratio on EcoBoost-equipped trucks. Super Duty (F-250/F-350) uses a heavier-duty setup: a Dana 60 or Dana Super 60 (M256 on newer trucks) up front, paired with a Sterling 10.5" or Dana M275/M300 rear, running common ratios of 3.31, 3.55, 3.73, and 4.30.
Early 4x4 F-Series trucks ran a genuine solid front axle (Dana 44), the simplest and most traditional setup.
Ford introduced its distinctive Twin Traction Beam (TTB) independent front suspension in 1980, using a Dana 44 TTB variant. This defined 4x4 F-150s and Broncos throughout the 1980s and into the mid-1990s. Rear axle during this period was typically a Ford 9" or 9.75" depending on year and configuration.
The tenth-generation F-150 redesign dropped the Dana 44 TTB front axle entirely in favor of a fully independent 8.8" IFS front axle. This is the single biggest driveline shift in F-150 history: from that point forward, no F-150 4x4 has used a solid front axle.
F-250/F-350 moved to their own dedicated heavy-duty platform. Critically, Super Duty 4x4 trucks kept a genuine solid front axle — meaning F-150 and Super Duty have run fundamentally different front axle philosophies since 1999, which trips up a lot of shoppers cross-referencing parts or regear options between the two trucks.
No major axle architecture change, but the ratio spread widened as Ford's engine lineup diversified (EcoBoost V6, diesel Power Stroke on Super Duty, hybrid PowerBoost), landing at today's 3.15 - 3.73 F-150 spread and 3.31 - 4.30 Super Duty spread.