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Old 04-19-2012, 01:57 AM   #1
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Join Date: Apr 2012
Location: Norwalk, Ohio
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Car: 1989 Firebird Formula
Engine: 385
Transmission: Full Manual TH350
Axle/Gears: Moser 9" 3.70

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1989 Firebird Formula

Just bought my bird about two weeks ago, and I'm wondering if anyone has factory specs on it.

It's a 1989 Formula with a 305 TPI, 700r4 trans, ws6 suspension package.

Also if anyone is curious, I paid $3500 for it. 94k miles, very clean interior. Perfect exterior minus one or two slight but noticeable scratches, and a Grand Am spoiler (lol). The previous owner has a shop bill of $800+ worth of work done in February, including all new fluids, all new filters, new exhaust, new alternator, etc. After I got it, I replaced a headlight motor (God help me) which was ~$110. I've heard a couple people say I got a pretty good deal, so comment if you'd like, but that's not the main point of this thread.

Anyway, was wondering if anyone has the factory specs for this, mainly what the factory rear end was in it, and the curb weight.

Thanks!
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1989 Firebird Formula
11.90 @ 114 MPH, 3500 pounds of factory Firebird!
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Old 04-19-2012, 01:52 PM   #2
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Join Date: May 2005
Location: Atlanta
Posts: 1,407
Car: 2002 Trans Am WS6, 1991 Trans Am
Engine: LS1, LB9
Transmission: T56, 700R4
Axle/Gears: 4.10 10 bolt, 2.73 10 bolt

Classifieds Rating: (0)
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Re: 1989 Firebird Formula

Should be 2.73s in the rear-end. Weight should be in the 3300-3400 range. Looks like a good deal for the money.
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Old 04-19-2012, 08:34 PM   #3
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Join Date: Apr 2012
Location: Norwalk, Ohio
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Car: 1989 Firebird Formula
Engine: 385
Transmission: Full Manual TH350
Axle/Gears: Moser 9" 3.70

Classifieds Rating: (2)
Re: 1989 Firebird Formula

Thank you. Everywhere I went for curb weight, it was all "no data." Couldn't find anything for factory rear end either.

So far I've seen numbers ~15.9 for quarter times, that's slightly disappointing. Going to work at dropping a 350 in it, and see what happens from there.
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1989 Firebird Formula
11.90 @ 114 MPH, 3500 pounds of factory Firebird!
Still has A/C
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Old 04-19-2012, 10:49 PM   #4
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Join Date: Aug 2008
Location: pensacola florida
Posts: 545
Car: 91 Trans Am
Engine: 5.7 350 TPI
Transmission: 700r4
Axle/Gears: 3:23

Classifieds Rating: (0)
Re: 1989 Firebird Formula

the 305 TPI autos were slugs because of the 2.73 rear ends. Those are what kill you, but there good cruisers for those gears if your using it not to race.
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Old 04-19-2012, 10:57 PM   #5
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Join Date: Dec 2001
Location: Chicagoland
Posts: 3,103
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45

Classifieds Rating: (3)

Re: 1989 Firebird Formula

Get a pic of the SPID sticker in the center cosole up.
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1989 IROC-Z, LB9, T-5, 3.45 -- 11K miles
1983 Z/28, LU5, 700R4 T5, 2.93 -- 102K miles
1985 IROC-Z, LB9, 700R4, 3.42 -- 41K miles
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Old 04-20-2012, 12:10 AM   #6
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Join Date: Apr 2012
Location: Norwalk, Ohio
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Car: 1989 Firebird Formula
Engine: 385
Transmission: Full Manual TH350
Axle/Gears: Moser 9" 3.70

Classifieds Rating: (2)
Re: 1989 Firebird Formula

Center console was empty when I got it, all that's left is a little glue residue that used to hold it on.

Also, I'm definitely going to race it at some point or another, so I'll look into getting a better gear. Any specific suggestions?
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Still has A/C
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Old 04-20-2012, 01:23 AM   #7
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Join Date: Aug 2008
Location: pensacola florida
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Car: 91 Trans Am
Engine: 5.7 350 TPI
Transmission: 700r4
Axle/Gears: 3:23

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Re: 1989 Firebird Formula

G92 off a third gen is the best factory one you can swap 3.42 rear end disc brakes or find a 98 or up 4th gen rear end to swap
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Old 04-20-2012, 07:35 AM   #8
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Join Date: Nov 2007
Location: Maryland's Eastern Shore
Posts: 504
Car: 1989 RS Vert
Engine: L03
Transmission: 700R4
Axle/Gears: 3.42

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Re: 1989 Firebird Formula

Quote:
Originally Posted by PhoenixFirebird View Post
So far I've seen numbers ~15.9 for quarter times, that's slightly disappointing. Going to work at dropping a 350 in it, and see what happens from there.
My completely stock 87 Camaro with carb LG4, auto, and 2.73 gears was doing 15.9's all day. I suspect a TPI should be a little faster
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Old 04-20-2012, 11:12 AM   #9
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Join Date: Apr 2012
Location: Norwalk, Ohio
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Car: 1989 Firebird Formula
Engine: 385
Transmission: Full Manual TH350
Axle/Gears: Moser 9" 3.70

Classifieds Rating: (2)
Re: 1989 Firebird Formula

Quote:
Originally Posted by two-if-by-sea View Post
My completely stock 87 Camaro with carb LG4, auto, and 2.73 gears was doing 15.9's all day. I suspect a TPI should be a little faster
Alright, that's comforting. I've been looking around a bit, and I've seen Formula 350's around mid 14s.
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Old 04-20-2012, 11:12 AM
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