Q: What's included in the 1LE performance package?

A: The package required these options (Z28/Formula, respectively):

Basic option group (FZAB/1SA)
A/C delete (until 1996 when A/C became standard)
6-speed transmission or performance rear axle with the automatic (GU5/G92)
Z-rated tires w/ 150 speedo (QLC/QLC)
Base stereo
and it consisted of:

Higher rate front springs (360 lbs/in for mid-1994 and after)
Variable rate rear springs (130-180 lbs/in for mid-1994 and after)
Stiffer front and rear shocks (Koni double adjustable for 1996 and after)
Harder bushings (front upper/lower and rear control arms)
Larger diameter anti-sway bars (32mm front, 21mm/19mm rear)
Increased cooling (for 1995 and after)
Engine oil cooler (1993 - 1995)
Stronger Transmission mount for 6 speed Transmission's
Stiffer Panhard-bar bushings

The 1993 1LE cars had the same springs and deCarbon shocks (but with much stiffer valving) as on the stock Z28s and Formulas. Initial 1994 1LE cars received the same set-up, but sometime during model year (between Dec 94 and Mar 95), the 1LEs received stiffer (higher/variable rate) springs and the shock valving was slightly reduced (but still considerably stiffer than the stock deCarbon valving). Due to the stiffer springs and modified valving, the 21mm rear sway bar was dropped in favor of the 19mm bar (which was the same as on the stock Z28s and Formulas). In 1996, the Koni double adjustable shocks became standard on the 1LE cars. Increased cooling on 1995 and after models was accomplished by the addition of an air conditioning radiator baffle even though no AC was available in 1995. Also, after 1995, in order to get the 1LE on the Firebird or Trans Am you had to order the WS6 package. According to the 1997 Pontiac brochure, the 1LE package could not be ordered with the automatic transmission.

Here's a list of suspension parts and prices for 1994 models:

Part No. Description Wholesale / List Price
---------------------------------------------------------------
22145653 Left front upper control arm $109.50 $146.00
22145654 Right front upper control arm $109.50 $146.00
22145389 Left front lower control arm $111.75 $149.00
22156436 Right front lower control arm $111.75 $149.00
26032907 Front stabilizer bar $67.37 $89.70
26039956 Stabilizer bar insulator (2) $7.20 $10.00
10262147 Rear axle tie rod $33.94 $45.25
10164151 Rear lower control arm (2) $49.31 $65.75
10021221 Rear stabilizer bar $45.94 $61.25
22124790 Rear shock absorber (2) $57.75 $77.00
22132561 Front springs (2) $80.00 $100+
22132562 Rear springs (2) $80.00 $100+