ReGearing My Off Road Vehicle

When do I need to consider regearing my 4x4?

Your vehicle's gear ratio has an effect on how much torque and horsepower is available to you across the RPM band. Changing your vehicle’s gears shifts the power band forward or backwards, and can compensate for modifications like larger tires.

When larger tires are installed, you have several things working against you: the diameter of the tire, rotational mass, rolling resistance, and the added weight of the tires. By regearing to a shorter gear, you will increase the amount of force that is being sent to the axle and this allows your vehicle to move the tires with less strain on the engine.

We have trained hard to become experts in regearing and can help you select the gear ratio for your needs!

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Regearing Jeep

Jeep ReGearing

Often times, you need more power out of your Jeep because of a lift kit and bigger tires. The factory ratios are not low enough to give you the power you need with these modifications. The acceleration and power band will seem to have slipped due to your upgraded tires and wheels. This just means it’s time to re-gear and reclaim your power!

  • Our regearing packages include:
    • Front and rear ring and pinion gear set
    • Master install kits 
    • New differential bearings
    • New front axle seals
    • Replace with new gear oil
    • Labor - Installation Done Right

* Does not include 500 mile check-up and fluid exchange

Gear Ratio Guide for Larger Tires

This chart is based on 65 MPH and a gear ratio of 1:1, with a manual transmission in 4th gear. PLEASE NOTE: If you have an automatic transmission your RPM will be higher due to normal slippage in the transmission and the torque converter. With an overdrive transmission your RPM in overdrive will be 15% to 30% less than indicated.

Here is a link to a gear ratio calculator and RPM calculator.

Regearing and lockers

What are lockers?

The two main goals for off-roading are simple: overcome obstacles and maintain traction. In fact, aftermarket mods thrown onto off-road rigs are aimed at beefing up a vehicle’s ability to perform these two tasks. A locking differential is certainly no exception.

Lockers are designed expressly for 4-wheel drive systems to give you the ability to lock or unlock the differentials when necessary.

There are two types - E-locker and Air Locker.  There is a great debate on which one is better (kind of like winch cables - steel or synthetic. At John’s 4x4, we like to mate the solution to the vehicle and other needs of the build.

We offer ARB, Eaton Lockers, and more!

Call us for a free quote to install gears or lockers in your rig!

Meet Austin!



"We do gears right...not necessarily cheap"

Important Considerations:

  • Tire size today versus the tire size you want to move to in the future
  • Balancing RPMs and performance
  • Vehicle specific gear options
  • Do you have strong enough axles to support the tire size and the obstacles you plan to tackle?
  • If you are regearing, we highly suggest considering lockers if you don't already have them. Nows the time! We got it fully dismantled and will save you money in the long run.
  • Are the technicians re-gearing your vehicle trained by the gear manufacturers and other specialists in the industry?

Our Off-Road & Outfitting Process



  • Discuss your goals
  • Qualify the platform
  • Understand your budget



  • Pre-mod inspection
  • Plan build stages with you
  • Deposit & parts ordered



  • Perform the approved work
  • Send you progress updates
  • Review & educate @ delivery


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6367 Arapahoe Rd Boulder CO 80303


(Loveland, Windsor, Greeley, Fort Collins, Berthoud)

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5002 Marketplace Dr Ste 103 Johnstown, CO 80534

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