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sub frame for an ls1

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Old 04-27-2003, 02:47 AM
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sub frame for an ls1

i was wondering if ne1 has had a tweeking prob with thier 3rd gens with an ls1 because i cracked my windshield with a 305 ho with a mild cam


i want a ls1 and t56 before next winter for a winter project but wasnt sure if it would blow out my t-tops



thx for ne help
Old 04-27-2003, 08:47 AM
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Car: 4
Engine: 6
Transmission: 5
Everybody has that kind of problem with these cars; it doesn't require an LS1 to create it.

It is solved by subframe connectors.
Old 04-27-2003, 10:41 AM
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Car: Bright Red 91 GTA
Engine: CARBED LT4
Transmission: MK6
ive heard of twisting the car so that the top wont go back in. but thats the first ive heard of a cracked winshield...

gm cut a few corners didnt they
Old 04-27-2003, 02:55 PM
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every time i kick it down with the t-tops of the windshield crack gets bigger and bigger how much weight would the subframe add
Old 04-27-2003, 05:42 PM
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Car: 1991 Formula Firebird
Engine: 2001 LS1 Modded
Transmission: 2001 4L60E Yank SS3600 TC
I am not sure how much weight they will add. However, I am fairly certain that it is not excessive. It sounds like you need to so this regardless. I am using spohn SFCs in my LS1 conversion.
Old 04-27-2003, 07:44 PM
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Car: Bright Red 91 GTA
Engine: CARBED LT4
Transmission: MK6
my subframes are 2x3 boxed steel...there 70 pounds for the pair
Old 04-27-2003, 08:16 PM
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Car: 1989 TransAm GTA
Engine: One sweet modified 355 TPI.
Transmission: The kind that shifts....
70lbs well worth it I imagine. My car has the T-tops and i've never had a problem with 'flooring' it, however if I ever got traction I imagine I'd shatter one of them.

I really want SFC's but have to build up a little cash.
Old 04-27-2003, 09:08 PM
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FRUITY ONE do u have manaul or auto i have the t5 manual and i creep up amd then punch itits all throttle control tho
Old 04-28-2003, 01:28 PM
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Car: 87 IROC-Z
Engine: 2002 LS6
Transmission: 6 speed
Axle/Gears: 4-11
I have a 3rd gen with t-tops. I have subframs and a roll bar. and I am thinking of upgrading to a full cage.

The weight add on is very minimal when you compare the benifits of stiffening the car up.

I have around 400 Hp right now with a manual tranny. I have never had any problems with the windshield or t tops.
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