Beretta.net

Ok i got a very cheap but in nice condition 93 grand am gt with a overheated 3300, and i want to swap a 3800 into it. i can get a whole 3800 wrecked car to use in the swap, Anyone got pics of their buildup, like how the motor mounts worked out, and the oil filter adapter, and how bad the wiring was to do. Those are the only real problems i guess. What tranny did you use? And if you used the 65 what was done about the longer cv axels, or does the 60 bolt up fine?  Anyone got some answers? thanks

Well the grand am with the 3300 I think has different mounts than the grandam with the 3100/beretta with 3100.

I think it has mounts that will bolt up to the 3800 since the 3300 is also a 90 degree motor.

I'd go for the supercharged series II 3800 (97+) if you are going to bother.

The 4T60-E will bolt up fine, and for ease of this job, I'd just use that. If it goes out then you can worry about putting in the 65 and axles/etc.

Oil adapter you'll just have to see what you need to use/swap if anything. Wiring well you'll likely have to use the ECM from the donor 3800s/c car. You'll have to keep your stock ECM to control the transmision probably as the 3800 ecm would expect things that your 93 trans doesnt have. I'm guessing the 93 transmision is a 60-e? or is it not electronically controled?

But any route you'll likely have to keep both computers and use one to control the motor and one for the gauges etc. You'll need to find wiring diagrams and splice wires/etc. That's going to be the hard part. Or you could get an aftermarket computer and use that to run the engine. Those cost a lot and you'll have to tune it perfectly, but might be easier than messing with all the wiring of putting 2 ECM's in.

There might be a better route for computers but I don't know of one..

No one realizes how many similar parts there are between the 3300 and the GNX engine... one person does though.

GNX is the same engine as the normal 3.8 turbo I thought. Just different stuff like turbo with ceramic fins, intercooler, etc.