Can You Change Gear Ratio 2019 Ram 1500

Changing the gear ratio in your 2019 Ram 1500 is a modification that can significantly alter its performance characteristics. Whether you're aiming for improved acceleration, better fuel economy at highway speeds, or enhanced towing capabilities, understanding the implications and the process is crucial. This article will walk you through the technical aspects of gear ratio changes, what to consider before making the swap, and the general process involved. Consider this a conversation with a trusted mechanic, guiding you through the intricacies of this modification.

Understanding Gear Ratios: The Basics

Before diving into the specifics of changing the gear ratio, let's establish a solid understanding of what gear ratios actually *are* and how they impact your truck. The gear ratio, often expressed as a number like 3.21 or 3.92, represents the number of rotations the pinion gear (connected to the driveshaft) needs to make for every one rotation of the ring gear (attached to the differential). A *higher* numerical gear ratio (e.g., 3.92) means the pinion gear turns more times for each rotation of the ring gear, resulting in more torque multiplication but potentially lower top speed and fuel economy at higher speeds. A *lower* numerical gear ratio (e.g., 3.21) does the opposite; it prioritizes higher top speed and fuel economy at the expense of acceleration and towing power. Essentially, it's a trade-off.

Torque multiplication is a key term here. Think of it like a lever: a longer lever provides more leverage, making it easier to lift a heavy object. Similarly, a higher gear ratio provides more leverage to the engine, allowing it to overcome greater resistance – perfect for hauling heavy loads or accelerating quickly.

The 2019 Ram 1500 typically comes with a few different gear ratio options from the factory, often varying based on the engine and trim level. Common ratios include 3.21, 3.55, and 3.92. You can usually find your truck's gear ratio listed on the build sheet or by checking the axle code stamped on the axle itself.

Why Change the Gear Ratio?

Several compelling reasons might lead you to consider changing the gear ratio in your Ram 1500:

• Improved Acceleration: A higher gear ratio can dramatically improve off-the-line acceleration. If you frequently find yourself wanting more pep from a standstill, this is a significant benefit.
• Enhanced Towing Capacity: Towing heavy loads puts significant strain on your engine and transmission. A higher gear ratio provides more pulling power, making towing easier and reducing wear and tear on your drivetrain.
• Correcting for Larger Tires: Installing larger-than-stock tires effectively changes your overall gear ratio, usually making it "taller" (lower numerically). This can lead to sluggish acceleration and inaccurate speedometer readings. Re-gearing to a higher ratio can restore performance and correct the speedometer.
• Fuel Economy Optimization (Situational): While counterintuitive, changing to a *lower* gear ratio might improve fuel economy if you primarily drive on the highway at steady speeds and rarely tow. However, this is highly dependent on driving habits and terrain.

However, it's crucial to understand the potential drawbacks:

• Reduced Top Speed: Higher gear ratios limit your top speed.
• Increased Engine RPM at Highway Speeds: A higher gear ratio means your engine will be working harder (higher RPMs) at cruising speed, potentially leading to increased fuel consumption and engine wear.
• Potential for NVH (Noise, Vibration, Harshness): Improper installation or incorrect gear selection can introduce unwanted noise and vibrations.

Is it Feasible on a 2019 Ram 1500?

Absolutely. Changing the gear ratio on a 2019 Ram 1500 is a common modification and entirely feasible. The 2019 Ram 1500 typically uses independent rear suspension (IRS) on some models and a solid rear axle on others. The process differs slightly depending on which setup your truck has, but re-gearing is doable on both. You'll be working directly with the differential, which is the heart of this operation. It's a complex assembly of gears and bearings that allows the wheels to turn at different speeds when cornering while still transferring power from the engine.

What's Involved in the Gear Ratio Swap?

Here's a general overview of the process. This is not a substitute for a detailed repair manual and experience. If you're not comfortable working on complex mechanical systems, it's best to leave this to a professional.

1. Gather Information and Parts:
   • Determine Your Current Gear Ratio: As mentioned earlier, check your build sheet or axle code.
   • Decide on Your Desired Gear Ratio: Consider your driving habits and goals. Use online gear ratio calculators to estimate the impact of different ratios.
   • Purchase the Correct Gear Set: This includes the ring gear and pinion gear. Make sure they are compatible with your axle model. Reputable brands like Yukon Gear & Axle, Nitro Gear & Axle, and Motive Gear are commonly used.
   • Purchase a Master Overhaul Kit: This kit includes all the necessary bearings, seals, shims, and crush sleeve needed for the installation. Don't skimp on this! Properly installed bearings are critical for the longevity of the gears.
   • Gear Oil: Use the correct type and weight of gear oil recommended for your differential.
   • Required Tools: You'll need a comprehensive set of tools, including:
     • Sockets and wrenches (including torque wrench)
     • Dial indicator
     • Magnetic base
     • Case spreader (if required by your axle model)
     • Bearing press
     • Seal driver
     • Dead blow hammer
     • Shop rags
     • Penetrating oil
2. Disassembly:
   • Drain the Differential Oil: Place a drain pan underneath and remove the drain plug.
   • Remove the Axle Shafts: This typically involves removing the wheels, brake calipers, and disconnecting the axle shafts from the differential. The exact procedure varies depending on your Ram's configuration.
   • Remove the Differential Cover: Carefully remove the cover, being prepared for any remaining oil to spill out.
   • Remove the Carrier Assembly: This involves unbolting the carrier bearing caps and carefully removing the entire differential carrier assembly.
   • Remove the Pinion Gear: This usually requires using a pinion holding tool and impact wrench to loosen the pinion nut.
   • Remove the Ring Gear from the Carrier: This typically involves removing bolts securing the ring gear to the carrier.
3. Installation:
   • Install the New Ring Gear on the Carrier: Torque the bolts to the manufacturer's specification.
   • Install New Bearings: Press new carrier bearings onto the carrier assembly. Use a bearing press to avoid damaging the bearings.
   • Install the New Pinion Gear: This is where things get critical. You need to set the correct pinion depth using shims. This requires careful measurement and adjustment using a dial indicator.
   • Install the Carrier Assembly: Carefully install the carrier assembly, ensuring the bearing caps are properly aligned.
   • Set Backlash: Backlash refers to the amount of play between the ring gear and pinion gear. This must be set within a specific range, typically a few thousandths of an inch. Adjust this by shimming the carrier bearings.
   • Check Tooth Contact Pattern: This is the final and most crucial step. Apply marking compound to the ring gear teeth and rotate the assembly. The resulting contact pattern will tell you if the pinion depth and backlash are set correctly. Adjust as needed until you achieve the desired contact pattern. An incorrect contact pattern will lead to premature gear failure.
4. Reassembly:
   • Install the Axle Shafts: Reinstall the axle shafts, brake calipers, and wheels.
   • Install the Differential Cover: Use a new gasket or sealant and torque the cover bolts to the specified torque.
   • Fill with Gear Oil: Fill the differential with the correct type and weight of gear oil.
5. Break-In Period:
   • Follow the manufacturer's recommendations for breaking in the new gears. This typically involves driving gently for the first few hundred miles, avoiding heavy loads or high speeds.
   • Change the Gear Oil: After the break-in period, change the gear oil to remove any metal particles that may have accumulated.

Important Considerations and Potential Issues

Here are some additional things to keep in mind:

• ABS/Traction Control Issues: After changing the gear ratio, your ABS and traction control systems may need to be recalibrated. The vehicle's computer uses wheel speed sensors to detect wheel slip, and an incorrect gear ratio can throw off these calculations. Some aftermarket tuning solutions or scan tools can recalibrate these systems.
• Speedometer Calibration: Your speedometer will likely be inaccurate after changing the gear ratio, especially if you're also changing tire sizes. You can correct this using a speedometer calibrator device or through a custom tune.
• Axle Model Compatibility: Ensure the gear set you purchase is specifically designed for your Ram 1500's axle model. There are different axles used on these trucks (e.g., 9.25" Chrysler, etc.).
• Crush Sleeve: Some axles use a crush sleeve to preload the pinion bearings. This is a one-time-use item and must be replaced whenever the pinion gear is removed. It requires significant torque to "crush" the sleeve to the correct preload.
• Professional Installation: If you lack the experience or confidence to tackle this job yourself, it's best to have a qualified mechanic perform the gear ratio swap. A botched installation can lead to costly damage and safety concerns.

Conclusion

Changing the gear ratio in your 2019 Ram 1500 is a significant modification that can yield substantial performance benefits. By carefully considering your driving needs, understanding the intricacies of gear ratios, and following proper installation procedures, you can transform your truck's capabilities. Remember, precision and attention to detail are paramount for a successful and long-lasting gear ratio swap. If any of these steps seem daunting, consult a trusted mechanic to ensure the job is done right.