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tpi performance question

Old Apr 19, 2015 | 10:22 PM
  #1  
Barlow8869's Avatar
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From: Mattoon Il.
Car: 1989 IROC-Z / T-Top -1987 GTA
Engine: 305 (LO3) _350 (L98)
Transmission: 700R4 _ 700R4
Axle/Gears: 2.73 L.S. - ???
tpi performance question

if this is in the wrong place, please move it for me

ok, i have an 87 gta with a tpi 350 and 700r4 ... i dont have any clue what has been done to her over her life, other than the cat has been taken off and everything from there back was replaced ... here is my question, would a stock tpi 5.7 brake the rear loose when hitting second gear? i have never had a stock 350 before, but i wouldnt think that would happen from a stock motor and trans ... btw, the rpo code sticker is gone so i dont know the gears yet
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Old Apr 20, 2015 | 10:27 PM
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From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
A stock, non worn out, unmolested L98 car has enough power to chirp tires when switching into second gear. A 28 year old "stock" but clearly not unmolested L98?... probably not.
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Old Apr 21, 2015 | 02:37 AM
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Barlow8869's Avatar
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From: Mattoon Il.
Car: 1989 IROC-Z / T-Top -1987 GTA
Engine: 305 (LO3) _350 (L98)
Transmission: 700R4 _ 700R4
Axle/Gears: 2.73 L.S. - ???
Re: tpi performance question

she shows 150k, wish i could find out what all has been done to her, if anything
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Old Apr 25, 2015 | 08:32 PM
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From: Northern California - Bay Area
Car: 1988 IROC-Z
Engine: L98 - full intake & exhaust boltons
Transmission: Bowtie 700r4, 2400 rpm stall
Axle/Gears: Borg-Warner 9bolt, 3.45 gears, posi
Re: tpi performance question

For 1987 all of the L98 f-bodies came with 3.27 gears in the 9bolt borg warner rear.

I agree with what the other poster said, a good running L98 that is not worn out does have enough power to chirp the tires going in to second gear even with the stock soft shift set up from the factory. When I got my car over 10 years ago it had 153,000 miles on it and it would chirp the tires going in to second at full throttle if the conditions were right.
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Old Apr 26, 2015 | 12:14 AM
  #5  
Barlow8869's Avatar
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From: Mattoon Il.
Car: 1989 IROC-Z / T-Top -1987 GTA
Engine: 305 (LO3) _350 (L98)
Transmission: 700R4 _ 700R4
Axle/Gears: 2.73 L.S. - ???
Re: tpi performance question

well, i did find out the rear end went out at some point and was replaced ... po said he thinks it had drums factory, has disks now ... no rpo codes though to be sure though
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Old May 2, 2015 | 04:31 PM
  #6  
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Posts: 68
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From: SOUTH JERSEY
Car: 87 FIREBIRD / 89 TRANS AM GTA
Engine: Ls1 / 350 L98 TPI
Transmission: 4l60e / 700R4
Axle/Gears: 3.73 / 3.27
Re: tpi performance question

It possibly may have a shift kit in it like mine. I have a 89 gta shifting from 1st to 2nd it chirps and goes sideways lol.
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