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2004 ss drivetrain swap to 2004 9c1
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944nate
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PostPosted: Mon Nov 17, 2014 3:57 pm    Post subject:  2004 ss drivetrain swap to 2004 9c1 Reply with quote

I have a totaled 2004 ss that is not fixable and a 2004 9c1 that needs a transmission, i was thinking of swapping the motor ,trans, harness, and computer and probably bcm from the ss to the 9c1. I do not have the gauges from the ss and i could use the na motor from the 9c1 for another car. I am pretty knowledgeable on the basics of the 3800's. Anyone seeing any problems with gauges ? fuel pump?swapping the bcm?
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Frank
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PostPosted: Mon Nov 17, 2014 6:50 pm    Post subject:   Reply with quote

The best thing to do is swap the engine, transmission, and PCM but not the BCM. The 9C1 has different options and a few different things inside the car wiring-wise (including surveillance mode, dome light operation, and trunk release switch) that is different from non-9C1 cars.

You will however have to have someone with a tuner or go to the dealer to have the VIN in the PCM changed to match the VIN stored in the BCM or the car will not start. After that you may have to do a security relearn and it should start.

Gauge swap should be fine but you will need the mileage in the SS cluster reprogrammed to match the car. Fuel pumps may or may not be different but the L67 should run fine with the L36 fuel pump (I ran the L36 pump that came in my car for over a year after my swap).

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944nate
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PostPosted: Mon Nov 17, 2014 7:39 pm    Post subject:   Reply with quote

Sounds good , its a small winter project i was just needing some insight on before starting. Also i remember someone saying one of the cv axles are different, im pretty sure the drivers side in the ss is bent .
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PostPosted: Mon Nov 17, 2014 11:58 pm    Post subject:   Reply with quote

Small winter project? I'd hate do figure out what a 'big' winter project would be for you. Laughing

You are correct about the CV axles being different. I think it's only one side that is different though. A quick part number search should tell you all you need to know.

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PostPosted: Tue Nov 18, 2014 12:25 am    Post subject:   Reply with quote

It's not bent, it's just shorter and it's only one side. Don't get remans when you do it - get a new axle or two.

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PostPosted: Tue Nov 18, 2014 2:39 am    Post subject:   Reply with quote

944nate wrote:
Sounds good , its a small winter project i was just needing some insight on before starting. Also i remember someone saying one of the cv axles are different, im pretty sure the drivers side in the ss is bent .
The police cars had HD transmission like the SS does
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Frank
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PostPosted: Tue Nov 18, 2014 3:13 am    Post subject:   Reply with quote

Impala_03 wrote:
The police cars had HD transmission like the SS does

Not exactly. GM advertised the 9C1/9C3 as having "heavy duty" transmissions but they were simply a 4T65E with 3.29 gear ratio. The 4T65E-HD in the 04-05 SS has a larger differential and cover, thus requiring a shorter axle on one side. It also has 2.93 gear ratio.

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944nate
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PostPosted: Tue Nov 18, 2014 6:17 pm    Post subject:   Reply with quote

Frank wrote:
It's not bent, it's just shorter and it's only one side. Don't get remans when you do it - get a new axle or two.

I meant the one from my donor ss is bent from an accident.


I buy and sell W bodys , GPs , GAs ,Bonnies and similar to fund my real projects
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PostPosted: Wed Nov 19, 2014 12:58 pm    Post subject:   Reply with quote

944nate wrote:
I buy and sell W bodys , GPs , GAs ,Bonnies and similar to fund my real projects



Drool Hang Head 2

That is a beautiful vehicle!!

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944nate
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PostPosted: Sat Nov 22, 2014 8:32 pm    Post subject:   Reply with quote

Frank wrote:
The best thing to do is swap the engine, transmission, and PCM but not the BCM. The 9C1 has different options and a few different things inside the car wiring-wise (including surveillance mode, dome light operation, and trunk release switch) that is different from non-9C1 cars.

You will however have to have someone with a tuner or go to the dealer to have the VIN in the PCM changed to match the VIN stored in the BCM or the car will not start. After that you may have to do a security relearn and it should start.

Gauge swap should be fine but you will need the mileage in the SS cluster reprogrammed to match the car. Fuel pumps may or may not be different but the L67 should run fine with the L36 fuel pump (I ran the L36 pump that came in my car for over a year after my swap).


Can i just take the pcm to the dealer or will they need the car?
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PostPosted: Sun Nov 23, 2014 2:11 am    Post subject:   Reply with quote

My friend at the Chevy dealer was able to program my spare PCM w/o the car. Also, while 9C1/9C3 cars do not have the 4T65E-HD transmission there are specific parts in these transmissions which are only in 9C1/9C3 cars. I spent time on the GM parts computer which shows part numbers specific to these cars. Planetary gear sets come to mind. GARY

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944nate
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PostPosted: Sun Nov 23, 2014 2:51 pm    Post subject:   Reply with quote

Got the motor and trans installed! I have always had bad luck with my local Gm stealership so i might find another one to go to, or send it to someone with a tuner . What do people do with the fuel lines? Use the l67 lines or l36 rail ? If it even fits?
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PostPosted: Sun Nov 23, 2014 4:56 pm    Post subject:   Reply with quote

I just snapped my L36 lines into the L67 rail. Yeah, there's a 90 degree elbow, but it doesn't bother anything and it's been that way for over six years since I did my swap with no issues.

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PostPosted: Sun Nov 23, 2014 6:27 pm    Post subject:   Reply with quote

Awesome , they fit decent with no kinks , Anyway to use the old L36 PCM just to start it? I am unsure of the condition of the motor , i purchased it from an auction with no keys and some other missing parts ,oil looks good,turns freely, 168k miles, i have it in the car and wired up , going to take the PCM to the dealership tomorrow . I just want to make sure it dont smoke or knock before i take it back out to detail it and replace all the parts known to fail.
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944nate
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PostPosted: Mon Nov 24, 2014 5:49 pm    Post subject:   Reply with quote

Ok , dealership wants the car with engine completely installed and said price will start @ $125 and they said it might not reflash! Anyone know who i can send it to? I really dont want to completely install the engine because i just want to know the condition of the bottom end before i freshen it up.

Frank , will the car start if i install the SS BCM and do a relearn just for me to hear the motor? I plan on getting an overkill tune after i find the lower end is good and do a few mods.
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