[HBWaterfowler]

Introduction for 1979, Ford's TRX option involved a select combination of suspension equipment, specific wheels, and unique Michelin tires. It also involved special spring and shock rates and specific stabilizer bar sizes (all for increased roll stiffness), engineered to complement the exclusive TRX tire-and-wheel combination.

Pre-1985 Mustangs were offered with three levels of suspension equipment: base, Handling, and TRX. The non-V8 models came with a retivility light-duty standard (base) suspension system. The heavier-duty Handling suspension option and performance-orientend TRX wheels/tires/suspension package were optional at extra cost.
The 1982-1984 Mustang GT and V8 LX's were also offered with the TRX wheel-tire-suspension option. Both these extra-duty suspension packages added stiffer springs, a larger diameter front stabilizer bar, specific shock and strut valving, firmer suspension bushings, and a read stabilizer bar.
Although some crossover (quad-shock) components came through on some late 1984 Mustangs, Handling suspension and TRX suspension compoents were seperate and distinct and were not ordered on or normally fitted to the same vehicle.
When the TRX option was dropped after 1984, "Special Handling suspension" came to refer to the standard GT suspension and steering gear.

This was the last year that the TRX suspension, wheel, and tire equipment was offered. It was also the only model year that TRX and Quadra-Shock equipement could both be factory fitted to the Mustang.

The TRX suspension/wheels/tire option was retained for the 1980 Mustang models. In the second year in production, the option included revalved shock absorbers and front and read stabilizer bars whose sizes again depended on the engine ordered.

The TRX handling system was also offered, including special suspension components, wheels, and tires.

The first Saleen Mustang model was produced when three prototype 1984s were assembled.

1984 1/2
A special 20th Anniversity edition was introduced by Ford in March 1984. Although a planned "improved-performance 5-liter" package was partially delayed until 1985 model year, most of the suspension upgrades involved entered service late in the 1984 model run. This was the first year of gas-pressurized struts and shocks, variable-rate springs, and rear Quadra-Shocks were used on production Mustang V8 models.

Dealer order Special Service vehicles by way of a DSO, which stands for Dealer Special Order."DSO" actually descripes the method by whitch a dealer obtains all nonstandard, specially equiped cars and trucks from the factory.

Standard equipemnt:
-relocated remote decklid decklid release button
-engine oil cooler
-external automatic transmission fluid cooler
-aircraft hose clamps
-heater hose restriction sleeve
-single-key locking system
-specially reinforced reclining front bucket seats
-floorpan reinforcements
-deleted underhood sound absorber pad
-cert. calibration 0-160 mph speedometer
-P215/65R15 Goodyear Eagle GT +4 all season performance tires
-black painted aluminum wheels
-conventional spare tire and full-size aluminum wheel
Optional:
-silicone-rubber coolant hoses
-deleted paint stripes
-VASCAR two-peice speedometer cable
-spare-tire cover board
-radio noise-suppression package($60)
-130 amp alternator
-inoperative courtesy lamp switches
-delete door moldings

Just some stuff I was looking at reguarding this.