change over question for 1993 and 1995 L67 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-13-2008, 05:49 PM   #1
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Default change over question for 1993 and 1995 L67

I have two bonnievilles, ones a 93' and ones a 95' they are both L67 cars.

the 93 was just wrecked badly but still runs great.
the 95 has a blown tranny and running but high mileage engine.

my question is, will i have any problems swapping the 93'* drivetrain into the 95, or since they are both series 1 L67'* will it be a direct swap? are there any wiring differences? ECMs need swapped?

im hoping for a smooth swap. all input is appretiated.
thanks, -Chris
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Old 04-13-2008, 06:56 PM   #2
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Going L67 to L67 like that, internal wiring won't matter at all. You will have to use the engine wiring from the 95 though, as the PCMs, and the pinouts, changed.

You will need to swap over your EGR valve as those are completely different in design and function. Swap the supercharger, throttle body, reservoir bracket, and pivot rockers, and all should be good there.

Transmission is another story. Pinouts AND electronics package changed. You can make the 93 trans work, but it will require you to swap the internal harness and temp sensor from the 1995.
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Old 04-13-2008, 07:27 PM   #3
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Quote:
Originally Posted by sandrock
Going L67 to L67 like that, internal wiring won't matter at all. You will have to use the engine wiring from the 95 though, as the PCMs, and the pinouts, changed.

You will need to swap over your EGR valve as those are completely different in design and function. Swap the supercharger, throttle body, reservoir bracket, and pivot rockers, and all should be good there.

Transmission is another story. Pinouts AND electronics package changed. You can make the 93 trans work, but it will require you to swap the internal harness and temp sensor from the 1995.
whats the reasoning fo changing the supercharger,egr,TB, etc.? just performance, or is there something more?

so swaping cradles and using the engine/trans wiring harness and ecm from the 93' wont work directly?

i really have no concern for the added power of the 95'* components, time is the biggest factor and i would like to avoid changing more then i have to.
of course if its a must then ill do it.

but the cradle for cradle swap is what i want to do now and then maybe when the car isnt needed for imediate use and theres a secondary means of transportation ill add the 95'* supercharger and conponents
or maybe keep the 95' motor, harness, and ecm together as a package to use as a future swap or sell to a fiero guy to use.
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Old 04-13-2008, 08:27 PM   #4
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The EGR'* are totally different.

In order to make the best TIME, swap the entire PCM, wiring harness, trans, and motor.

While it may seem at first that they are very similar, they are not. For instance, I at one time thought about swapping my 95 L67 to the 93 L67 PCM for simplicity sake so both cars would be the same and I could ditch the 'hybrid' 94/95 PCM.

There would have been TONS of wiring involved. The two years have very different PCM'* with different connectors.
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Old 04-13-2008, 08:58 PM   #5
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Quote:
Originally Posted by willwren
The EGR'* are totally different.

In order to make the best TIME, swap the entire PCM, wiring harness, trans, and motor.

While it may seem at first that they are very similar, they are not. For instance, I at one time thought about swapping my 95 L67 to the 93 L67 PCM for simplicity sake so both cars would be the same and I could ditch the 'hybrid' 94/95 PCM.

There would have been TONS of wiring involved. The two years have very different PCM'* with different connectors.
thank you,
that pretty much answers all of my questions. Now, when i do swap the harness into the 95' will it all plug in correctly, or will there be differences in the pin'* or anything else? and when i install the pcm into the 95' will there be any concerns about any guages not working or is the dash wiring the same?

thanks, -chris
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Old 04-13-2008, 09:03 PM   #6
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I don't think you realize that you're going to have to gut the entire dash out of the car to swap harnesses? This isn't something you're going to do in a week.

You need to START with the factory service manuals for BOTH years.
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Old 04-13-2008, 09:22 PM   #7
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Quote:
Originally Posted by willwren
I don't think you realize that you're going to have to gut the entire dash out of the car to swap harnesses? This isn't something you're going to do in a week.

You need to START with the factory service manuals for BOTH years.
No i didnt realize that. I dont have the manuals but i will deffently get them before i tackle the project. But first, Do you think i will have to modify either harness to make this work? If i must swap interior harness'* too then i will even though it will be a pita, Im comfortable with hooking up/bolting up whatever is nessasary, But i really dont want to tackle a one off wiring harness with almost no electrical technical knowledge.
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Old 04-13-2008, 10:04 PM   #8
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You are going to have to be very adept at reading factory schematics in order to do it. I haven't checked (this is a huge project, not something I can answer in a simple 30 minutes of checking, which I don't have for you right now in spite of owning those two very manuals), but I HAVE looked into different bits and pieces of this over the years in light of the fact that I own those two years and have those two manuals.

The entire PCM wiring harness that spiderwebs inside and outside the cabin is quite different between the two years, and the plugs on the PCM are not even close. All that has to be swapped.

I can gaurantee you will have to splice wires based on the manuals during the swap. Even if you use the 95 harness primarily.
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Old 04-14-2008, 01:40 AM   #9
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Quote:
Originally Posted by willwren
You are going to have to be very adept at reading factory schematics in order to do it. I haven't checked (this is a huge project, not something I can answer in a simple 30 minutes of checking, which I don't have for you right now in spite of owning those two very manuals), but I HAVE looked into different bits and pieces of this over the years in light of the fact that I own those two years and have those two manuals.

The entire PCM wiring harness that spiderwebs inside and outside the cabin is quite different between the two years, and the plugs on the PCM are not even close. All that has to be swapped.

I can gaurantee you will have to splice wires based on the manuals during the swap. Even if you use the 95 harness primarily.
thanks alot for taking the time to answer my questions. im glad i didnt just dive into it this afternoon when i had the chance. Great forum. good straight forward responces. im sure this wont be my last post. Ill look over the manuals and then make my final desision. i may end up just swapping in the good tranny and changing sensors as another member said and just run the high mileage 95' motor for now.
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Old 04-14-2008, 07:02 AM   #10
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Hmmm....Wren, I think he wants to move the 1993 powertrain to the 1995 body, correct? And both of them are L67, correct?

If the electronics (i.e. PCM) are good in the 1995 still, leave them. When you remove the 1995 powertrain (which I assume is garbage), take the engine harness with it. Remove the AC lines and take the compressor with the engine (This is 134A stuff...easily obtained but can still remain attached to the car if you need it to be. I find it is easier to have the compressor on the motor when going in so there is no manuvering around it and the hoses). Swap the harness, compressor, superchager and TB (I will get to why in a moment), and EGR. The roller rockers from the 1995 motor will bolt into the heads of the 93 block...you will want those too.

The reason why we say swap the 'chargers is because the 94/95 breed are more efficient than the 92/93 models. It is also what the 1995 PCM will expect to see.

And as I said before, doing the wiring harness swap will make your 1993 transmission electrically compatible to the 1995 PCM, though not necessarily better. The 1995 trans got way more updated parts than the 93 has, and is a bit stronger. Use the 93 trans with the harness mod as a temporary until you can rebuild the 95 model trans.
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