Dana 44 Ring and Pinion

What a ring and pinion does

The ring gear and pinion gear turn the driveshaft's rotation ninety degrees and reduce it to drive the wheels. Their tooth counts define the axle ratio, such as 4.10 or 4.88. A numerically higher ratio multiplies torque more, which helps a vehicle fitted with bigger tires, and a lower number favors highway rpm and fuel economy. Gears wear out, and they are often replaced when the vehicle is re-geared for larger tires or when a differential or axle is rebuilt.

Choosing a ratio

Pick the ratio based on tire diameter, engine power, transmission, and how you drive. Taller tires effectively lower your gearing, so owners often move to a numerically higher ratio to restore lost performance. A rule of thumb is to compare the revolutions per mile and cruising rpm before and after the change. Heavy vehicles, towing, and low-torque engines benefit from steeper gearing, while a lightly loaded vehicle that does a lot of highway driving may suffer at too high a ratio. Always gear the front and rear axles to the same ratio, since mismatched ratios can damage the transfer case and drivetrain in four-wheel drive.

Details to confirm

• Axle position: front and rear sets differ. Some Jeep front axles use reverse-rotation gearing, listed with an R in some part numbers.
• Carrier break: a ratio like 3.73 and below uses a different carrier than 4.10 and above. Confirm the correct carrier or use the right master kit.
• Application: listings for YJ, JK, and JK Rubicon sets reflect different housings and options, so match your model.
• Kits: some sets include bearings, shims, and hardware in a master installation kit.

Installation notes

Gear setup is precision work. Pinion depth, backlash, and bearing preload must be measured and adjusted for quiet operation and long life, and incorrect setup quickly ruins gears. Unless you have the tools and experience, professional installation by a shop that does differential work is recommended. Use the specified gear oil and break in the gears gently, following the manufacturer's guidance, which usually includes short drives and an early fluid change.

Also plan for ancillary changes, such as speedometer recalibration and anti-lock or traction control settings, after a ratio change. Always confirm fitment for your exact year, make, and model, and check the manufacturer's specifications.

Preparing and breaking in

Inspect the rest of the axle before spending on gears. Check the carrier bearings, pinion bearing, and axle shaft condition, and replace the seals at the same time, since a leaking pinion seal will soon contaminate a new set. Wipe the housing clean and check it for cracks around the pinion and the axle tubes. Mark and record the existing backlash and the wear pattern, as it helps diagnose any problem with the new set. A quality set should come with a marking compound and a setup procedure. After installation, drive gently for the first several hundred miles, avoid heavy towing, let the axle cool between runs, and change the gear oil early to remove metal particles from the break-in.