Lt1/t56 swap
Thread Starter
Junior Member
Joined: Jun 2011
Posts: 20
Likes: 0
From: westville nj
Car: 87 iroc z
Engine: lt1
Transmission: t56
Axle/Gears: posi 3.42
Hey guys my l98/700r4 in my 87 iroc is on its last leg, so I've decided to swap in a lt1/t56 out of my 96 z28.just thought I would make a build thread.will be updating in the next few days with progress.
Last edited by 87z28guy; Mar 7, 2012 at 07:35 PM.
Thread Starter
Junior Member
Joined: Jun 2011
Posts: 20
Likes: 0
From: westville nj
Car: 87 iroc z
Engine: lt1
Transmission: t56
Axle/Gears: posi 3.42
Re: Lt1/t56 swap
hey everyone cant believe its already been a month.well i finally started last weekend got the motor and trans out of the car so far and have started to repaint the engine bay.i will get pics up as soon as i can figure how to get them off my phone.
Supreme Member
iTrader: (1)
Joined: Feb 2005
Posts: 2,642
Likes: 2
From: Pleasant Grove, Utah
Car: 1993 GMC Typhoon
Engine: 4.3 Turbo
Transmission: 4L60
Axle/Gears: 3.42
Re: Lt1/t56 swap
sweet man, if you need help, send me a pm or post up, you can also view my LT1 swap thread here, just search my name.
Senior Member
Joined: Feb 2009
Posts: 885
Likes: 0
From: USA
Car: 1989 SS
Engine: LT1+1500$ hooker exhaust
Transmission: T56
Axle/Gears: 3.42 bogger
Re: Lt1/t56 swap
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Thread Starter
Junior Member
Joined: Jun 2011
Posts: 20
Likes: 0
From: westville nj
Car: 87 iroc z
Engine: lt1
Transmission: t56
Axle/Gears: posi 3.42
Re: Lt1/t56 swap
Got the engine and trans in last night motor fits very nice.now on to the dreaded wiring harness.more pics to come.
Thread Starter
Junior Member
Joined: Jun 2011
Posts: 20
Likes: 0
From: westville nj
Car: 87 iroc z
Engine: lt1
Transmission: t56
Axle/Gears: posi 3.42
Re: Lt1/t56 swap
Hey guys got the clutch pedals mounted.and as far as the wiring goes would it be easier to use the whole body harness from the 4th gen and just eliminate all the third gen wiring? I have the whole harness from the car.just seems like it would be easier just to plug everything in rather than splice wires and repin connectors.also would i still need the computer reprogrammed if i decide to go that route?
Joined: Sep 2004
Posts: 5,906
Likes: 240
From: Chicagoland Suburbs
Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
Re: Lt1/t56 swap
Hey guys got the clutch pedals mounted.and as far as the wiring goes would it be easier to use the whole body harness from the 4th gen and just eliminate all the third gen wiring? I have the whole harness from the car.just seems like it would be easier just to plug everything in rather than splice wires and repin connectors.also would i still need the computer reprogrammed if i decide to go that route?
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