I have this '89 that I have owned for about 7 years. I have always been under the impression that it was stock, except for the exhaust and stereo. There is, however. this sticker on the door jamb saying it was modified by Automobile Specialty Company. I have no idea what could have been modified and I



have no paperwork. I also have this logo on the trunk and have no idea what it means. Other than telling me that I need a new top, can anybody be of any help? Thanks!

 

The rear sticker is an add on that a previous owner put on the car. The ASC sticker was applied to all 3rd gen "factory" convertibles, and some that weren't factory, but dealer optioned. GM did not do in house convertibles on the 3rd gens, so when they started offering it in 1987, they used ASC. Very similar to them using SLP for the SS upgrades on the 4th gens.

 

@okfoz to the courtesy phone, OKFOZ...........

 

John is quite knowledgeable, for sure, but I think Scott covered it completely.

The sticker on the decklid is not factory (GM or ASC) and the ASC sticker on the inside door was due to ASC's Convertible Conversion. My 1992 T/A Convertible has the same sticker along with a stamped month/year. I suspect this one might have had a stamped month/year as well, as most of the ASC Convertibles I've looked at have, but it may have rubbed off?

 

Scott got it. All 86-92 Factory/ASC Convertibles got the sticker. I actually met the guy that worked for ASC and put the sticker on them. Great Conversation.

 

I believe I'm correct in saying that all convertibles left the Van Nuys Pontiac plant as T-Top cars, and were trucked to Long Beach to ASC. The tops were removed, SIGNIFICANT structural enhancements were made to the car, as well as the convertible top installation, I believe ASC also had a US facility in Michigan.

ASC also did many many convertible tops for foreign car manufacturers; in fact, they originally did those prior to doing them for GM, and continued to do so until they went out of business, I believe in 2005.

Here are a few places to get a top:
You should probably anticipate between $500 and $750 to have it professionally installed.

https://robbinsautotop.com/convertible-tops-416

https://www.topsonline.com/model/Con...hird_Gen).html

 

Yes, all F-body ASC Convertibles were indeed T-top chassis cars which had their heads cut off. The T-top car was used for a couple of reasons, firstly the windshield header was already there, and it was simpler than removing the top from a hard top. Secondly T-top cars had a thicker floor-pan, and some other structural enhancements which may not be noticeable to the naked eye, and there are some changes to T-top cars which are noticeable, for example the door wedges. ASC had facilities in California (I assume Long Beach) and one in Livonia, MI, the Livonia plant also is where they made the GNX. ASC added a sub-frame connector, and they welded in another reinforcement under the threshold, they also added bracing behind the doors. They then cut the top off, folded it up and sent it to be recycled. For the "Factory" cars there were fiberglass covers for the T-tops and the rear Window which were reused. Cars which were Dealer ordered by ASC had the T-tops removed and the parts were sold, other people say they were scrapped.
1982-1985 General Motors Buick Riviera System supply
1983-1999 General Motors Chevrolet Cavalier System supply
1983-1997 General Motors Pontiac Sunbird/Sunfire System supply
1984-1990 Ford ASC/McLaren Mustang System supply
1984-1985 General Motors Cadillac Eldorado System supply
1984-1985 Toyota Celica Full conversion
1985-1987 American Motors Renault Alliance GTA System supply
1986-1994 General Motors Chevrolet Corvette System supply
1986-1994 Saab Saab 900 Turbo System supply
1987-1992 General Motors Chevrolet Camaro Full conversion
1992-2002 General Motors Chevrolet Camaro System supply
1987-1989 Toyota Celica Full conversion
1989-1990 DaimlerChrysler Dodge Dakota System supply
1989-1992 General Motors Pontiac Firebird Full conversion
1993-2002 General Motors Pontiac Firebird System supply
1989-1991 Porsche 944 S2 System supply
1990-1991 General Motors Buick Reatta System supply
1991-1993 Toyota Celica Full conversion
1991-1992 Infiniti M30 System supply
1991-1994 Rover Metro System supply
1990-1993 DaimlerChrysler Dodge Shadow System supply
1992-1995 Porsche 968 System supply
1992-1994 Nissan 240SX System supply
1993-1996 Nissan 300ZX System supply
1995-1997 Mitsubishi 3000GT System supply
1995-1999 Toyota Celica Full conversion
1996-2000 Mitsubishi Eclipse System supply
1997-2002 BMW Z3 System supply
1997-2000 Toyota Paseo/Cynos Full conversion
2000-2003 Toyota Solara Dual-stage manufacturing
2002-2004 BMW Z4 System supply
2003-2006 General Motors Chevrolet SSR
2004-200? Toyota Solara System supply
2004-200? Hot Rods & Horsepower Dearborn Deuce Convertible System supply/body assembly
2006-200? Mitsubishi Eclipse System supply
ASC also made all of the WS6 Trans Ams and Formulas from 1998-2002
I believe ASC Went bankrupt in 2007