Passenger car solid rear axles went the way of the carburetor right around the same time front-wheel drive and fuel injection became popular. By the 1990s, solid rears were basically reserved for trucks and not much else. Independent rear suspension became prevalent in rear-wheel drive car applications like modern Challengers and, for daily drivers, offers a fine mix of performance, stability, and ride quality.
However, for those that lean more towards strip than street, a solid rear axle is still the equipment of choice. Moser Engineering, ever in tune with the ones that go wheels up, is making that possible with their 2009-newer Challenger M9 solid axle subframe kits (P/N M9HP11).
Offering the utmost in brute strength and adjustability, Moser’s package features an M9 fabricated housing with back brace, custom race axles, subframe assembly, anti-roll assembly, torque arm, track locators, and lower control arms. An aluminum center section and shock/spring packages are optional. Customization is nearly infinite. Among the available custom possibilities are axle spline count, fluid type, bolt pattern, stud size, calipers, rotors, and powder coating.
Installation is not for the faint of heart, but can absolutely be achieved with careful regard to Moser’s thorough instruction packet. The factory fuel tank and spare tire well both have to go to make way for the meat of the subframe, but most users will be going the fuel cell route anyway. The work is well worth it for the hardcore racer that requires way more beef and maximum suspension tuning.