I clearly remember a 15th Anniversary Edition Trans Am being displayed inside Marsh Pontiac’s small showroom on the Lincoln Highway in Ardmore, PA.
“… leaves the also-rans even further behind …”
For 1984, Pontiac announced a special edition Trans Am to commemorate the Firebird sub-model’s 15th year.
The $3,499 15th Anniversary Edition featured white paint with blue graphics that hearkened back to the original 1969 Trans Am. Other exterior components included the Aero Package optional on normal Trans Ams and T-tops. Mechanical features included the LG9 HO 190 bhp 5.0 liter/305 ci V8 with a four-barrel carburetor, the WS6 special handling package, four-wheel power disc brakes, and P245/50R16 tires (a size still readily available) on 16 x 8 inch white hi-tech turbo aluminum wheels.
As had been true in many previous Trans Am special editions, the 15th Anniversary Edition Trans Am featured Recaro front bucket seats—these were leather with cloth inserts. Other interior features specific to the special edition included a white leather steering wheel and shifter knob. Standard equipment on all 1984 Trans Ams included sport mirrors, a rear deck spoiler, tungsten halogen headlamps, rally gauges, a console, and power steering.
Only the top of the line engine was available with the 15th Anniversary Edition, but there was a choice of transmissions. A five-speed manual came standard, with an automatic being a $295 option. 0-60 came in less than seven seconds—two to three seconds better than it had been in 1982. Fuel economy ratings were 16 city/27 highway by 1984 standards (13/20 by today’s measures). With a smallish 13.3-gallon gas tank, a Trans Am owner could expect a range of 200 to 255 mikes with a 10% fuel reserve.
Options and Production Numbers
Trans Ams (even special editions ones) did not come loaded in 1984—by the time the 20th Anniversary Edition came around in 1989, that would no longer be so. Exterior and mechanical options included Soft-Ray tinted glass ($110), an electric rear window defogger ($140), and a limited slip differential ($95).
Interior options included air conditioning ($730), power windows ($215), a power antenna ($60), and a Delco AM/FM stereo cassette with a five-band graphic equalizer ($590). Upholstery and trim options included six-way power seats ($215 each), a tilt steering wheel ($110), luggage compartment trim ($110), and cloth floor mats ($20 front/$15 rear).
Pontiac built a symbolic 1,500 15th Anniversary Editions—500 with the five-speed manual and 1,000 with the automatic. Those 1,500 were a small part of the 55,374 total Trans Ams made in the 1984 model year, with those sales less than half of 128,304 Firebirds sold (Pontiac sold a lot of base Firebirds). Both the Trans Am numbers and the overall Firebird sales marked an eighties peak for Pontiac, with only 1980 and 1982 coming close.
The View From 2020
15th Anniversary Edition Trans Ams do attract some collector interest. According to Hagerty’s valuation tools, all the money for a 15th Anniversary Edition Trans Am with the five-speed in #1/Concours condition is $28,400, with a far more normal #3/Good condition version with an automatic going for $9,500. These Trans Ams are often available in the Hemmings Motor News classifieds and on eBay Motors, and they sometimes show up at auction.
Make mine White, please—it’s not like I have a choice.
I evidently can’t help myself with eighties Trans Ams; I’ve also written about the 1981, the 1982, the 1985, and the 1989 Turbo. I probably should write about the Formula and the S/E at some point—perhaps even the base car.
Eighties Cars 
You forgot The UQ7 Sub package. Also not all 15ths were WS6 cars. They all however get all the WS6 goodies. Its weird I know but look into it on TGO. I can also verify this as my own 15th (Auto car), I have the build sheet. Lastly, the 84 15th was the first 80s TA to get the N96 16in wheels, later the 85-86 WS6 wheel, then Formula wheel before they changed the design.