Thread: Top Swap Info and Faqs, Also lots of 3800 Info

you need the 2 bar L67 map sensor for it to work correctly. it wont be able to read boost without it.

i would stick with the series 2 just to make sure it would work.

Originally Posted by WindsorGP

Would you have to change cams at all or leave the stock one in also what about the tranny's. I've read a few post and I don't think nobody really ask these questions. I'm going to be in the process of a swap in the next few months and would really like to know now before I find out that I should have done these then instead later on when somthing blows in my face and feel like idiot.

I tried to touch on the Trans in the original post, the stock transmissions are the weak link in our cars....If it helps, my non-hd trans has 17+ track passes and 10 months of DD and no signs of any problems**knock on wood**

Originally Posted by MNGP07

do you need a new map sensor for a top swap or will mine work?

If you want to read boost, you will need the 2 bar sensor for a GTP, but you will need a GTP BIN loaded into your PCM so the PCM can understand the different MAP

Originally Posted by Bio248

you need the 2 bar L67 map sensor for it to work correctly. it wont be able to read boost without it.

Like I just said, you need to adjust computer to use the 2-bar

Originally Posted by MNGP07

ok, so then will any SC map sensor from 97+ work? or just series 2?

All 97 - 02(maybe 03 as well) use the same 2-bar map sensor, the Series III actually uses two map sensors(one is used as a baro), and they physically look like the L36's 1-bar sensor

Originally Posted by Bio248

i would stick with the series 2 just to make sure it would work.

Once again, depends on the year of the car you are top swapping, I'd like to request that whoever posts questions from now on, please state the year your car is

Originally Posted by MNGP07

I got a 98 and ill be top swapping in a week!!!!!!!!!!!!!!!! wooooo

Nice, I have 98 L67 parts on my 02

Originally Posted by 02BlueGT

Nice, I have 98 L67 parts on my 02

I'll have 03 parts on my 04.

Originally Posted by 03monteSS

and can it be as easy as going to a salvage yard and getting like a crashed gtp and swapping over the necessary parts?!?

Yes and no. Still need to get the PCM programmed. You could use the GTP PCM but it would need your VIN programmed into it.

And it's not just GTPs. 04-05 supercharged Monte SS's and 04-05 Impala SS's have compatible parts too.

Also, I wouldn't recommend doing a direct plant from one car to another. Junk yard parts will be dirty. Especially the heads. Look at this thread for what the heads I got looked like before and after I took them to the machine shop:

http://www.grandprixforums.net/f18/r...ads-10753.html

Originally Posted by Sabrewings

You could use the GTP PCM but it would need your VIN programmed into it.

why? i have a VIN in my PCM that doesnt match my car and i just passed emissions today.

Maybe it's different with GPs. In Impalas and Montes if the VIN in the BCM doesn't match the VIN in the PCM it won't even try to crank. Just gives you a security light.

i reused the ones that were in the motor. they are the same in comparison from GT to GTP.

Originally Posted by 03monteSS

and mine is an 03 so they didnt make em supercharged yet but are the parts form an 04-05 compatible to my 03?

04-05 Montes and Impalas. Not 04-05 GPs.

Are top swaps only used if you want to supercharge/turbocharge your engine? If one were to swap tops and keep the car NA, would there still need to be reprogramming of the PCM? Hopefully I didn't miss this information in the previous posts....

I would love to do some forced induction on my car, but I really don't feel like taking the chance of abusing my transmission - at least not at this time. The car has to be a reliable daily driver so a broken transmission/wore out clutch is of no use.