LT1 or LS1 Swap Kit for 3RD Gen

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Jan 11, 2002 | 02:07 PM

wm_sorg

Thread Starter

Senior Member

Joined: Dec 1999

Posts: 954

Likes: 1

From: Annandale, VA

Car: 1991 Formula Firebird

Engine: 2001 LS1 Modded

Transmission: 2001 4L60E Yank SS3600 TC

LT1 or LS1 Swap Kit for 3RD Gen

Hi all,

I am considering doing an LS1 or LT1 swap for my 91 TP1 Formula. Are there any kits available that include harness and ECM. Are there issues for gauges? Can the 700r4 handle the power? Lastly, how much will the comversion cost?

Thanks for your help.
BILL

Jan 11, 2002 | 05:50 PM

mat89RS

Senior Member

Joined: Apr 2001

Posts: 884

Likes: 2

From: Québec

Engine: LT1

Transmission: 700r4

No kit available, it's called "do it yourself"

Jan 13, 2002 | 04:03 PM

wm_sorg

Thread Starter

Senior Member

Joined: Dec 1999

Posts: 954

Likes: 1

From: Annandale, VA

Car: 1991 Formula Firebird

Engine: 2001 LS1 Modded

Transmission: 2001 4L60E Yank SS3600 TC

How did you handle the electronics? Did you use the LT1 ECM. Was there any incompatiility with the gauges?

Jan 15, 2002 | 01:19 AM

LT1Powered85Z

Junior Member

Joined: Dec 1999

Posts: 62

Likes: 0

From: Bloomington, MN

Car: '85 Z28

Engine: 396ci LT1

Transmission: T56

Axle/Gears: 4th Gen rear with 4.10s/Eaton posi

Check out my web page...I've got A LOT of info regarding the swapping of an LT1 into a 3rd Gen car.

Good luck, and if you have any questions feel free to e-mail me.

http://lt1powered85z.cz28.com

Eric

Jan 15, 2002 | 01:22 PM

mat89RS

Senior Member

Joined: Apr 2001

Posts: 884

Likes: 2

From: Québec

Engine: LT1

Transmission: 700r4

I did the wiring myself using the TBI harness and the LT1 harness.
wasn't that hard ... you couls also purchase a painless wiring of jegs but it's actually about the same thing as doing one yourself.

Jan 17, 2002 | 10:32 PM

LS1 IROCZ

Junior Member

Joined: Feb 2001

Posts: 36

Likes: 0

From: Kiel, Wi

Car: 87 IROC-Z

Engine: 2002 LS6

Transmission: 6 speed

Axle/Gears: 4-11

check out my website for the ls1 swap

Last edited by LS1 IROCZ; Jan 17, 2002 at 10:35 PM.

Jan 20, 2002 | 12:37 PM

White Ninja

Member

Joined: Jan 2002

Posts: 470

Likes: 0

From: Yardville, New Jersey

LS1IROCZ, what kinda mounting brackets did you use? did you buy that LS1 crate? how long did that swap take you? Any serious or moderate modifications that you needed to do?