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Old 06-15-2005, 06:57 PM   #1
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Default L67 Motor Swap

I was just wondering if anyone that has actually completed the swap from a 1996 3800 Series 2 to a L67? Any information would be great. The big issues I have is the transmission modes? My car does not have any switches next to the shifter, but the donor car has traction control and other features. Some other items I know I am switching is the fuel pump, exhaust system, motor and transmission of course, and the PCM. I am not quite sure past that. I was planning on keeping my original gauge cluster if possible. The donor car does not have boost gauge or any of that it is the same as mine. I start the swap the weekend of the 23rd, but I would like to have all of my ducks in a row before then.
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Old 06-15-2005, 07:16 PM   #2
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if you don't already have the Factory Service Manual for your 96, get it before you begin. Also, if you get a different year L67, get that FSM too.

Your cluster should not be a problem unless you get the drivetrain from a 97 or newer. I've done some research and found that the sending units have different output range begining in 97. Also, the fuel level signal goes into the PCM and is outputed to the cluster as a Pulse Width Modulated (PWM) signal. You would have to verify that the 96 PCM sends out the same PWM.

By looking at the diagrams, the shift mode is determined by a 348 ohm resistor for preformance shift and an open circuit for normal. I plan on using a push-in illuminated switch from the Shack or somewhere but you could probably get the switches from the junk yard of from someone here. As a precaution, I'd suggest getting a length of the wire harness in case your car is not equipped with it.

I also noticed that there were several differences in the engine harness connector/grommet from the L67 to the L36 so you might want to get the inside half of that connector as well.
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Old 06-15-2005, 07:22 PM   #3
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Enjoy getting the interior part of that connector. It probably entails taking the entire dash apart. But if you and a buddy get going...it'll be done before you know and you'll be looking at a creature...Octopus family for surre!
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Old 06-16-2005, 11:55 AM   #4
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The actual project I am doing is really two seperate jobs. The two cars are 1. 1996 Pontiac Bonneville SE 2. 1996 Pontiac Bonneville SE SC I plan to switch everything from the SE SC to the SE, and then put everything from the SE into the SE SC, then sell the car with the L27. So I have everything needed for the swap, but it is all in the donor car.
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Old 06-16-2005, 03:08 PM   #5
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If they are the same year, then why are you trying to switch the instead of switching plates and registration? Also, the 96 would have the L36, not the L27 N/A motor. There is a wiring harness that ZZP makes for this swap you might want to check out.
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Old 06-16-2005, 03:23 PM   #6
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I'm guessing body shape, color and condition are the big factors...

Enjoy the swap...you might need to do the sub frame as well. (Not sure if the mounts are the same)
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