Regear Your RAM for Bigger Tires, Get Power Back

Big Tires, Big Problems (If You Skip the Gears)

If you’ve thrown 35s, 37s — or even bigger tires — on your RAM 1500, 2500, or 3500, you know the feeling: your truck looks killer, but suddenly it drives like it’s pulling an anchor.

Sluggish acceleration, constant downshifting, worse gas mileage — sound familiar? That’s because your stock differential gear ratio can’t keep up with the new tire size.

At Axleboy Offroad, we help RAM owners get that lost power back, the right way: precision differential re-gearing.

Why Bigger Tires Kill Performance:

Your RAM’s axles house differentials — gear sets that translate driveshaft power out to your wheels. Bigger tires change your final drive ratio. It’s like pedaling a bike in the wrong gear: you’re working way harder to go the same speed.

When your factory differential gears are too “tall” for the new tire size, your engine strains more, your transmission hunts for gears, and towing feels gutless.

Common signs your gearing is too tall:

Sluggish take-off
Downshifts on mild hills
Poor towing torque
Dropped 2–4 mpg
Transmission runs hotter, shortening its life

How to Pick the Right Gear Ratio

The perfect gear ratio depends on:

Your tire size
Your engine (Hemi, Cummins, etc.)
How you drive (daily, highway, towing, off-road)

Example:

If your RAM came with 3.55 gears and you upgraded from stock 32s to 37s — you might now be better off with 4.10s or 4.56s to bring your RPMs back in line.

Too high = weak torque.

Too low = screaming RPMs.

Just right = power AND MPG balanced.

Remember: We’re talking about the ring and pinion gears inside your front and rear differentials — not your transmission. Getting this ratio right makes your truck feel like it should again.

Why DIY Math Doesn’t Cut It

Online calculators are good guidelines. But we’ve seen plenty of RAM owners regret a regear because they picked the wrong ratio — too conservative or too aggressive.

At Axleboy, we calculate based on:

True tire measurements (mounted size, not just the number on the sidewall)
Your actual daily driving vs. towing vs. trails
Engine torque curves
RPM sweet spots for your transmission

It’s not just a number — it’s about restoring performance where it matters.

How We Regear RAM Trucks

1️⃣ Full Consultation

We chat about how you use your truck and where you feel it’s underpowered.

2️⃣ Ratio Match

We run the numbers — no guesswork. You’ll see recommended gear ratios for your differentials, and what each one means for power, towing, and fuel economy.

3️⃣ Quality Parts

We use trusted differential gear sets from Yukon, Revolution, or OEM-matched brands. Cheap gears lead to noise and premature wear.

4️⃣ Professional Install

Regearing is precision work: backlash, preload, and gear pattern checks — all dialed in to factory specs. We service both front and rear axles.

5️⃣ Break-In & Road Test

We ensure your new gears run quiet and smooth, and advise on proper break-in to protect your investment.

Benefits of a Proper Regear

Stronger launch off the line
Better towing power
Less strain on transmission
Restored fuel economy (or at least prevent massive loss)
Bring back the fun you lost with big tires!

Why RAM Owners Choose Axleboy

✔️ We’ve re-geared hundreds of RAMs — no rookie mistakes
✔️ Real consultation, not guesswork
✔️ Quality differential parts, proven install methods
✔️ Local St. Louis shop, honest advice