Helpful Drivetrain Calculators


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Limited Slip Differentials

High-Performance Axles

Ring and Pinion Gear Sets

USA Standard Quick Kits

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Shop the widest selection of aftermarket ring and pinion gear sets in the industry.

RANDYS Worldwide offers gears from Yukon Gear & Axle, USA Standard Gear, Ford Racing, Dana Spicer, the AAM Group, and others. Aftermarket ratios include 3.07, 3.08, 3.54, 3.55, 3.73, 3.92, 4.09, 4.11, 4.27, 4.56, 4.88, 5.13, 5.38, and 5.89, and many more. Yukon and USA Standard Gear products are manufactured to strict tolerances, use patented heat treatment, and undergo detailed quality assurance testing.

Our lineup of performance gears and replacement ring and pinions provide easy setup, superior strength, and unrivaled quality. With the popularity of bigger tires, a front and rear gear ratio change is the first, best step to maximizing the performance of your new wheel and tire combination. Remember to consider updating axle shafts, driveshafts, and u-joints when addressing big-tire concerns.

Our lineup of performance gears and replacement ring and pinions provide easy setup, superior strength, and unrivaled quality. With the popularity of bigger tires, a front and rear gear ratio change is the first, best step to maximizing the performance of your new wheel and tire combination. Remember to consider updating axle shafts, driveshafts, and u-joints when addressing big-tire concerns.

RANDYS carries drivetrain and differential axle kits for both front and rear differentials. Our brands, Yukon Gear & Axle and USA Standard Gear, cater to the replacement drivetrain industry and the performance aftermarket. Some of these kits come with traction options that include mechanical lockers, limited slip differentials, positractions, and selectable lockers.

Our axle kits contain all the components to replace, repair, or upgrade the axles in a front or rear differential and are available for Chevrolet, Ford, Dodge, Jeep, Cadillac, Toyota, GMC, Lexus, and Nissan vehicles.

RANDYS makes differential rebuilds much more managable. Our comprehensive line of differential rebuild and installation kits that include all the small parts you’ll need to get the job done right.

Depending on your needs, we have Mini-Kits, with the bare essentials for a gear swap or repair, all the way up to Master Overhaul Kits, which include every component necessary for a complete replacement of bearings, seals, shims, and more. Kits contain high quality Timken/Koyo bearings. Many kits include seals, shims, crush sleeves, pinion bearing and races, baffles and slingers, thread locking compound, carrier bearing and races, pinion seals, ring gear bolts, and gaskets.

Today’s driveshafts can be more difficult to repair than replace. Finding the perfect fit driveshaft that provides the optimal balance, correct yokes and universal joints, and quality tubing is rare. RANDYS sells OE replacement driveshafts and performance driveshafts.

USA Standard Gear factory replacement driveshafts are quality inspected and come with everything needed for direct, bolt-in installation, including fully greaseable u-joints for maintenance-free operation.

Yukon Gear & Axle performance driveshafts feature high-strength steel construction, the appropriate amount of slip travel, and are available in 1310 to 1410 u-joint applications. They offer incredible strength, increased operating angles to accommodate vehicles with moderate lifts, and a long life on the trail, up the rocks, or down the track.

RANDYS is all about getting the job done right, and so are these tools.

Having the right tool for the job saves time and money. When it comes to working on differentials, Yukon precision, high-quality differential tools address the widest selection of projects.

Choose from the following high-quality specialty tools: Axle Bearing Pullers, Trac Loc Assembly Tool, Yoke Holder, Cross Pin Shaft Extractor, Housing Spreader, Shim Driver, Race Drivers, Spindle Boring Tool, and Spanner Tools.

Increase the capability of your shop or home garage today by adding these top-of-the-line specialty drivetrain tools to your toolbox!