In the world of muscle cars, few parts carry as much old-school clout as the GM 12-bolt rearend. Born in the golden era of horsepower and high test, it earned its stripes behind everything from L78 Camaros to big-block Chevelles. Today, that same pedigree lives on in Moser Engineering’s 12-bolt built-to-order rearend package, a tough, track-proven piece that brings classic style and modern muscle together in one slick package.

Classic Looks, Modern Backbone

There’s something undeniably cool about seeing a 12-bolt cover peeking out from under a car. It’s a subtle nod to a time when horsepower ruled the streets and axle strength was a matter of pride. Moser understands that nostalgia and leans into it with their 12-bolt housing. It looks period-correct from the outside, but that’s where the retro vibes stop.

Each unit is built to order, packed with heavy-duty internals designed to handle everything from autocross launches to 1,000-horsepower drag strip abuse. Options include a choice of Eaton differentials, Truetrac units, or Moser’s own Wavetrac, plus gear ratios tailored to your needs. The assembly also includes 30-spline bolt-in axles made from Moser’s proprietary alloy, a choice of housing ends, and premium bearings and seals.

Tailored For Your Ride

Unlike off-the-shelf rearends, Moser’s 12-bolt package is spec’d out for your exact application. That means factory or narrowed widths, your choice of brakes or bare flanges, and compatibility with coilover or leaf spring setups. Whether you’re building a Pro Touring G-body, a restomod Nova, or just reinforcing your street car before a nitrous hit, this rearend can be built to fit your chassis and your goals.

And let’s not forget the strength. The center section features nodular iron construction and thick, reinforced tubes that resist flex under load. It’s a serious piece of equipment, but it still wears that iconic 12-bolt cover like a badge of honor.

The Right Kind Of Retro

Moser’s 12-bolt rearend offers more than brute force. It’s a statement. In a world full of generic nine-inch conversions, choosing a 12-bolt is a way to stay true to the lineage of your GM muscle. It keeps the build authentic and ties your powertrain to the legacy of the factory hot rods that made the platform famous. The Moser version just happens to be stronger, smarter, and far more forgiving when you drop the hammer.

For anyone looking to put down serious power without compromising style or strength, Moser’s 12-bolt built-to-order rearend is a rock-solid investment. It honors the legacy of one of GM’s most revered components while bringing it up to modern standards of precision and durability. Whether you’re racing, cruising, or just want to flex that 12-bolt under a Saturday night cruiser, this package delivers.