Bulletin 90-F-1 from 07/24/1989 announces the availability of the UPC LB9 5.0L engine together with the UPC MX0 Automatic Transmission on the 1990 Firebird GTA UPC Y84.
ADMIN NOTE: the LB9 engine was available with the MM5 manual transmission only in 1989.
Bulletin 90-F-2 from 08/29/1989 announces the return of the Hatch Roof Restriction on Firebird Formula, Trans Am, and Trans Am GTA models built with the UPC B2L 5.7L engine. It also announces the available build combination of a Trans Am GTA, Automatic Transmission, and Hatch Roof with the combination of the LB9 engine and MX0 transmission.
Bulletin 90-F-3 from 09/22/1989 announces the availability and pricing of the Performance Axle Package UPC G92 on Trans Am models with the UPC LB9 engine and MM5 Manual Transmission.
Bulletin 90-F-3* from 09/29/1989 is a revision of the earlier bulletin from 09/22/1989 denoting a change in axle ratio to 3.42 from the previous G92 ratio of 3.45. The reverse side side displays the correct way to submit a wholesale order for the UPC G92 package.
Bulletin 90-F-4 from 09/28/1989 addresses the approximately four week substitution of the UPC N36 base Firebird steering wheels in certain Trans Am models instead of the standard NP5 leather wrapped wheel. This change did not apply to Trans Am GTA models.
Bulletin 90-F-5 from 10/04/1989 announces the cancellation of the UPC U1A Compact Disc Player for ALL Firebirds for the remainder of the 1990 model year.
