1991 Formula in Idaho
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Junior Member




Joined: Oct 2017
Posts: 69
Likes: 5
From: Davis County, Utah
Car: 2021 LT1
Engine: Lt1
Transmission: Tr6060
Axle/Gears: 3.73
1991 Formula in Idaho
Hey guys, figured I’d post this up for anyone interested. Looks like a pretty clean car that hasn’t been overpriced yet. This is not my ad, I just have a search for third and fourth gen f-bodies on KSL and noticed this one.
1991 Pontiac Firebird Formula http://www.ksl.com/auto/listing/4776311
1991 Pontiac Firebird Formula http://www.ksl.com/auto/listing/4776311
Re: 1991 Formula in Idaho
Damn... I can't find much to fault with this one. The pics might be hiding some serious flaws, but it looks good from here. Makes me wish I wasn't married to my project.
Edit: Looks like the paint on the roof might be delaminating... Kinda hard to tell... But STILL!
Edit: Looks like the paint on the roof might be delaminating... Kinda hard to tell... But STILL!
Last edited by Drew; Jun 10, 2018 at 03:43 PM.
Thread Starter
Junior Member




Joined: Oct 2017
Posts: 69
Likes: 5
From: Davis County, Utah
Car: 2021 LT1
Engine: Lt1
Transmission: Tr6060
Axle/Gears: 3.73
Re: 1991 Formula in Idaho
Agreed. If I had the money it would be in my garage and the Iroc for sale. Would it be safe to assume that car has dual cars since it has a hardtop and the 140 mph speedo?
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iTrader: (1)
Joined: Nov 2017
Posts: 71
Likes: 4
From: South of Dallas
Car: Formula 350
Transmission: A4
Axle/Gears: 3.27
Re: 1991 Formula in Idaho
My 88 is stock and it has 140 speedo and single cat but it's an auto, I'm wondering about the red trim bird in between the taillights, that doesn't look right.
Re: 1991 Formula in Idaho
Yes, the car shows the N10 code per the VIN.
Re: 1991 Formula in Idaho
In 91 the options are pretty locked down. The only real variable is whether it was built when PBR rear brakes were available, or if it had drums substituted. Otherwise it should have the full R6P package, dual cats, 3.42 posi, oil cooler, etc.
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Thread Starter
Junior Member




Joined: Oct 2017
Posts: 69
Likes: 5
From: Davis County, Utah
Car: 2021 LT1
Engine: Lt1
Transmission: Tr6060
Axle/Gears: 3.73
Re: 1991 Formula in Idaho
Would this car only have a 110 mph speedo if it had the single cat system, regardless of whether it had tpi or not? What was the criterion for the 140 moh speedo? The R6P/G92 (in camaros) package?
Joined: Mar 2014
Posts: 4,553
Likes: 807
From: South Ms
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: 1991 Formula in Idaho
If that was close to me i would be putting it in my shop along side my redbird.
Joined: Aug 2013
Posts: 4,826
Likes: 913
From: MICHIGAN
Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: 1991 Formula in Idaho
Wish my son was out of school. That would be a great first toy for him.
Re: 1991 Formula in Idaho
Generally speaking, cars that came without speed rated tires are speed limited to 115mph give or take. You won't have the 140 cluster in a V6 or TBI car. Couldn't speculate off hand on what a LB9/auto could have, because they're a bit of a gray area and I don't pay a bit of attention to them. I mean, they're 305s with autos... Why God, why?
Joined: Oct 2001
Posts: 12,223
Likes: 1,148
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 1991 Formula in Idaho
If she only had TTOPs..
Joined: Sep 1999
Posts: 4,353
Likes: 308
From: NJ
Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: 1991 Formula in Idaho
Glad it doesn't have t-tops 
Wish I hadn't just bought another car or this would be on the way to my house right now ....

Wish I hadn't just bought another car or this would be on the way to my house right now ....
Re: 1991 Formula in Idaho
Same. T-tops are SO 1978.
Actually, I just find that the glare through the ttops is uncomfortable, and removing them, storing them, then reinstalling them when you're taking someone else's car, or have to stop someplace and secure the car... It's all just a pain. Actually easier to just put the top down on a convertible.
Anyone wanna buy a stripped roller?*
*some assembly required. Void where prohibited.
Actually, I just find that the glare through the ttops is uncomfortable, and removing them, storing them, then reinstalling them when you're taking someone else's car, or have to stop someplace and secure the car... It's all just a pain. Actually easier to just put the top down on a convertible.Anyone wanna buy a stripped roller?*
*some assembly required. Void where prohibited.
Joined: Mar 2014
Posts: 4,553
Likes: 807
From: South Ms
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: 1991 Formula in Idaho
Love my t-tops. That's almost a must have to me on these cars. Now if I were building a serious hot-rod i would want a hardtop. And I rarely ever take mine o ut.
Joined: Aug 2013
Posts: 4,826
Likes: 913
From: MICHIGAN
Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: 1991 Formula in Idaho
I love mine. And as it's usually a beautiful day when I take the car out, I pull those tops almost every time I drive. Having owned both, I much prefer to have them.
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