I've asked this before, but I dont think I got a definitive answer.


Does the supercarged Series II (or III) bolt directly to our chassis?

Can (do we have to) we use the tranny from the Series II? Will the axles fit?

We probably have to use the associated ECM and wiring. Do I just install the new one or would we have to change proms?

Can't answer about motor mounts though I know a gentleman with a 92 crate "L" 3800 in a '88.

The computer would need to be different is you have a 4T60E or 4T65E tansmission since the programming and discretes to run an E trans are not in the earlier ECMs. The EGR is also different (single solenoid rather than triple). */C is even more different with a seperate control line for the "wastegate" (think that is a turbo term and is something like "blower bypass" in the */c world but you get the idea). */C also has a considerably different spark advance curve and the MAF tables need to be extended.

So if the engine calls for a different ECM than what you have, it would be a good idea to use the right one, and its PROM, and be prepared to do some rewiring.

Say I get a wreck. And I can get the engine wiring, ecm, trans and complete engine. Is this what I'll need.

That'* what you'll need, but the motor mounts may have to be somewhat custom. That'* a big question. I know the axles will fit. Our suspension dimensions are identical. Distances between the struts are a perfect match.

Great! Although I'm not sure how'll pull off the custom mounts. Which engine combo should I look for? I hear '97 and above were the better engines.

96 was the first year for the SC Series 2. In 97, they got a 4T65 series trans, which seems to be more failure prone, but a better aftermarket selection of parts. If you plan to mod your trans, go with a 97 and up. Otherwise, for reliability, stick with a combo out of a 96 with the 4T60.

is it posible to put trans from a 92 in my 90? would they bolt up? i know the ECM is differnt, could i just put the ECM from the 92 in there? this is out of a N/A SSE

No, the 92 PCM wouldn't know what to do with your engine, and the 90 ECM wouldn't know what to do with that trans. You need the whole setup.

The other thing is that I don't think your gauges will work properly, mostly the speedo. Since you need to use the newer computer for the car you may have to find a way around the dash issue.

Speedo shouldn't be a problem. Most GMs run on a 4000 pulses per mile. I would imagine the 96s do as well. It would be cool if someone could look this up in thier service manuals. Mine is in the wiring diagrams' system description section.