'93 Engine/Trans transfer to '94 - 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 05-07-2007, 01:16 PM   #1
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Default '93 Engine/Trans transfer to '94

I have a 1993 SE I got into an accident with that has a good engine/trans. I found a 1994 SE with a good body but bad trans locally. I'm planning on swapping both the engine/trans from the 93 to the 94. In my other post, willwren pointed out that some things will not work from the 94 on the 93 engine and trans. Thread here So I'm looking for more details on what might have to be changed, and what wont match up with the 94.

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Old 05-07-2007, 11:18 PM   #2
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The transmissions are incompatible with each other. 94/95 uses a thermistor that reports temp back as an actual number to the PCM. 92/93 uses a thermal switch that switches at a critical temp, sending a fault signal to the PCM. The 93 trans cannot be controlled by a 94 PCM, and a 94 trans cannot be controlled by a 93 PCM. The connectors on the 93 and 94 PCM'* are different.

So you need to put the valvebody from the OLD trans into the NEW replacement trans to make it work.

I don't think you want to go through all that. A used trans from a wrecker would be a better bet (and no, 92 isn't compatible with a 93/94/95 PCM either).

Then we get to the EGR valve which is also different between 93/94. Enough issues you to say you don't really want to go there.
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