Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

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Old Apr 12, 2007 | 05:59 PM
  #1  
ceres's Avatar
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need help

i have an 1989 firebird forumla 5 speed 305 TBI i wanna kown what the best 350 i can put in her and how much money im looking to spend do i have to get a new tranny ect. thanks
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Old Apr 12, 2007 | 08:36 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Welcome aboard thirdgen.org.

Your questions are really open-ended. There isn't a mountaintop in the world you could go to to get a definitive answer. But, there are some generalities.

On the TBI forum is a sticky about a "budget" 350 build. Look that over and see what you think.

You don't "have" to replace the T5. But, if you don't take it easy on it, you will "need" a different transmission, guaranteed. But, there are members who have gotten T5's to live behind some pretty stout engines just by not doing clutch dumps or speed shifting. If you want to do those kinds of things, you need a better transmission.
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Old Apr 12, 2007 | 08:37 PM
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From: Mobile, AL
Car: GTA
Engine: 383 HSR
Transmission: TH-700R4
Axle/Gears: 3.42
Re: need help

Welcome to the boards.

You looking to know the best crate 350? Or 350 that you can find in a salvage yard?

Yes you can keep the same transmission if you wish. If it is stock then you would have a world class T-5 but a 350 will eventually tear it up.
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Old Apr 13, 2007 | 02:39 PM
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Re: need help

I MIGHT HAVE A CHEV 1988 350 DONT KNOW MUCH ABOUT IT DO YOU THINK IT WILL MOUNT UP
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Old Apr 13, 2007 | 03:47 PM
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five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Yes.
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Old Apr 13, 2007 | 04:55 PM
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ceres's Avatar
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Re: need help

sorry for all the ? when i floor it my shift handle lifts up is that because my tran is loose or is that normal its a 5 speed and also goto www.myspace.com then type in search person rattbird85@yahoo.com to see my firebird and please tell me if you think its worth putting a 350 in her thanks

Last edited by ceres; Apr 13, 2007 at 05:13 PM.
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Old Apr 13, 2007 | 05:09 PM
  #7  
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From: Middleboro, MA
Car: 1988 Pontiac trans am/gta
Engine: 350
Transmission: 700r4
Axle/Gears: 3.23's
Re: need help

Originally Posted by ceres
sorry for all the ? when i floor it my shift handle lifts up is that because my tran is loose or is that normal its a 5 speed
u need a tranny mount
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