3.4 swap?
Thread Starter
Member
Joined: May 2006
Posts: 264
Likes: 1
From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
3.4 swap?
Hey everyone.
I have a 3.4 4th gen donor that I might shred. Can I swap engine, trans, rear end and wiring loom wholesale into a 3rd gen?
Thanks in advance!
I have a 3.4 4th gen donor that I might shred. Can I swap engine, trans, rear end and wiring loom wholesale into a 3rd gen?
Thanks in advance!
Supreme Member
Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 3.4 swap?
Yss although the rear end will be wider than the factory rear.
Supreme Member
Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 3.4 swap?
About 2 or 3 inches you can use the third gen rear the drive shafts are the same. Also if I remember correctly if you get 4th gen rims the issue goes away.
Thread Starter
Member
Joined: May 2006
Posts: 264
Likes: 1
From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Supreme Member
iTrader: (3)
Joined: Feb 2003
Posts: 2,470
Likes: 6
From: Waterford, MI
Car: 1998 Camaro Z28
Engine: 6.0L
Transmission: 4L60E
Axle/Gears: 3.73
Re: 3.4 swap?
You need to swap the speedo gear, 2.8 is cable, 3.4 is electronic.
You'll be fine as long as you swap the engine and trans together. If you start trying to mix a 3rd gen engine and 4th gen trans (or vice versa), that's when you run into issues.
Are you trying to change over the PCM and everything as well? That may be a bit tougher to make it work with the rest of the car, since a 4th gen has a BCM, etc.
You'll be fine as long as you swap the engine and trans together. If you start trying to mix a 3rd gen engine and 4th gen trans (or vice versa), that's when you run into issues.
Are you trying to change over the PCM and everything as well? That may be a bit tougher to make it work with the rest of the car, since a 4th gen has a BCM, etc.
Thread Starter
Member
Joined: May 2006
Posts: 264
Likes: 1
From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Re: 3.4 swap?
You need to swap the speedo gear, 2.8 is cable, 3.4 is electronic.
You'll be fine as long as you swap the engine and trans together. If you start trying to mix a 3rd gen engine and 4th gen trans (or vice versa), that's when you run into issues.
Are you trying to change over the PCM and everything as well? That may be a bit tougher to make it work with the rest of the car, since a 4th gen has a BCM, etc.
You'll be fine as long as you swap the engine and trans together. If you start trying to mix a 3rd gen engine and 4th gen trans (or vice versa), that's when you run into issues.
Are you trying to change over the PCM and everything as well? That may be a bit tougher to make it work with the rest of the car, since a 4th gen has a BCM, etc.
Last edited by knightinblackar; Apr 25, 2018 at 06:12 AM.
Trending Topics
Supreme Member
iTrader: (3)
Joined: Feb 2003
Posts: 2,470
Likes: 6
From: Waterford, MI
Car: 1998 Camaro Z28
Engine: 6.0L
Transmission: 4L60E
Axle/Gears: 3.73
Re: 3.4 swap?
You'd still have to swap the speedo gear on the trans to the cable so it works with your cluster. Dash will take some splicing to get the gauges to work with your new engine/sensors, but should still work. I'll keep thinking, but nothing else is standing out as an issue other than time to splice some things here and there.
Or are you swapping interior as well?
Or are you swapping interior as well?
Thread Starter
Member
Joined: May 2006
Posts: 264
Likes: 1
From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Re: 3.4 swap?
You'd still have to swap the speedo gear on the trans to the cable so it works with your cluster. Dash will take some splicing to get the gauges to work with your new engine/sensors, but should still work. I'll keep thinking, but nothing else is standing out as an issue other than time to splice some things here and there.
Or are you swapping interior as well?
Or are you swapping interior as well?
Thread Starter
Member
Joined: May 2006
Posts: 264
Likes: 1
From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Member
Joined: Jan 2013
Posts: 396
Likes: 10
From: AL
Car: 1985 Firebird
Engine: 3.4 turbo
Transmission: Auto
Axle/Gears: 3.42
Re: 3.4 swap?
if I was going to swap in a fourth gen rear, i'd get one with disc brakes. I'd also pick a manual V8 car that had 3.42s in it.
Thread
Thread Starter
Forum
Replies
Last Post
86TpiTransAm
Transmissions and Drivetrain
2
Feb 28, 2001 08:22 AM