There were "TR Handling Suspension" (through '84 for Mustang and '85 for Capri) and "Handling Suspension" (called "Special Handling" after '84)packages, and they included additonal items to, or replacement items in, the 'regular' suspension. One example of an "additional item" that the 'regular' suspension did not have but the TR and Handling packages did would be a rear stabilizer bar. The TR package was standard on the '79 Pace Car, '79-81 Cobra, '81-'83 Black Magic, and '83 Crimson Cat and optional on everything else. The Handling package was included/required/mandatory with the turbocharged four-cylinder and the eight-cylinders.
Both packages had their own specific struts and shocks, front and rear stabilizer bar diameters, and front and rear spring rates. I can list the specifics of each package's stabilizar bars diameters and spring rates, if need be. Each package had "slapper bar" (through mid-'84) or Quadra-Shock rear suspension (mid-'84 and later). The TR package also required/included forged metric aluminum ("TRX") wheels and Michelin TRX tires.
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