I need help!

[CODFATHER]

Ok I have a 98 gp gt and might possibly be buying a 97 gtp form a friend for the swap ( very cheap). Both have motor and trans but the 97 gtp has a horrible body and is rusted out. motor is in excellent shape as is the trans and also of course have the wiring harness and pcm for both. What would be my best approach to getting a supercharged 3800 in my 98 gt. If i do a motor swap i will just sell the na 3800 from my gt to recoup some of the money and just put the gtp motor in my car. But! I need to know if it's worth it to buy a car with a motor/trans and everything I need or just to buy a 3800 sc motor by itself for around 500 with no trans. is it best to get the gtp in case i need something from it? Or should my wiring harness in the gt work with the gtp motor? Also.. will the non HD trans in my gt hold up to the new power if I at least go with a shift kit? The trans in my gt shifts great and i haven't had any issues with it. This car has been my DD and about a week ago my 1994 z28 got rear ended and totaled so i have some money to make my DD a fast car as well.
So basically it all boils down to... Can I put a 3800 sc motor in my gt with the stock trans.

Thanks in advance

[limegreen]

Ok I have a 98 gp gt and might possibly be buying a 97 gtp form a friend for the swap ( very cheap). Both have motor and trans but the 97 gtp has a horrible body and is rusted out. motor is in excellent shape as is the trans and also of course have the wiring harness and pcm for both. What would be my best approach to getting a supercharged 3800 in my 98 gt. If i do a motor swap i will just sell the na 3800 from my gt to recoup some of the money and just put the gtp motor in my car. But! I need to know if it's worth it to buy a car with a motor/trans and everything I need or just to buy a 3800 sc motor by itself for around 500 with no trans. is it best to get the gtp in case i need something from it? Or should my wiring harness in the gt work with the gtp motor? Also.. will the non HD trans in my gt hold up to the new power if I at least go with a shift kit? The trans in my gt shifts great and i haven't had any issues with it. This car has been my DD and about a week ago my 1994 z28 got rear ended and totaled so i have some money to make my DD a fast car as well.
So basically it all boils down to... Can I put a 3800 sc motor in my gt with the stock trans.

Thanks in advance

Can you get both from the supercharged car? ( motor & tranny )

[dsmuts]

You can and a shift kit will help the longevity of the trans. The 97 has different vacuum routing so that'll be a little different but it shouldn't be to bad of a swap. Your gt trans has a different gear ratio than the gtp so you'll have to get a pcm tuned for it.

[CODFATHER]

You can and a shift kit will help the longevity of the trans. The 97 has different vacuum routing so that'll be a little different but it shouldn't be to bad of a swap. Your gt trans has a different gear ratio than the gtp so you'll have to get a pcm tuned for it.

Alright that I expected for sure. And Yes I can get both the motor and trans from the supercharged car.
So a shift kit is a must then. I don't beat on my cars by any means but I would like it to hold up to the occasionally punk driving his daddy's corvette every now and then. I took down a 1999 vette in my 04 gtp comp g with just a 3.4 pulley and supporting mods. I plan on going much further with this car.
I think the gt trans is 3.23 and the gtp is 2.73 right? basically that'll only effect my speedo wont it? I wont mind it being off by a few mph for a little while if thats the case

[CODFATHER]

What about the suspension differerences between the two cars.. Are the shocks or front differentials different on a gtp to handle the extra power? Or is basically the only difference in the trans?

[Fivefingerdeathpunch]

GTP is 2.93's and GT is 3.29's

IF you put the GTP motor on the GT trans with the GTP pcm, the transmission will not have a clue what is going on and will not shift right. All the tables for the transmission in the PCM are for the GTP trans and the not the GT, so that is the reason why we say it will need to have all the trans files changed.

[MoarkatsINmuhtrailer]

97-02 gtp trans is all the same..
98-02 gt and se trans are all the same

[BillBoost37]

What I'd do is flip the 97 motor and trans into the 98 car. Then get ahold of a 98 GTP pcm. Everything will plug in except the map sensor and the boost control soleniod. Pull out a solder gun and move the map sensor to the back and the correct connector, then add one wire to the harness if you want the BCS. If not..allow vacuum to control it.

You will also need to swap the passenger side axle from the GTP, as it's a little shorter for the HD transmission.

As for the vacuum being different on 97 vs 98-02, it's so little of a difference. 97 has a vacuum tree on the charger that feeds the bcs and fpr. On 98+ it's all from the port under the snout.

[CODFATHER]

GTP is 2.93's and GT is 3.29's

IF you put the GTP motor on the GT trans with the GTP pcm, the transmission will not have a clue what is going on and will not shift right. All the tables for the transmission in the PCM are for the GTP trans and the not the GT, so that is the reason why we say it will need to have all the trans files changed.

Alright that makes complete sense. So i might as well go with the zzp 1.0 pcm then?

[CODFATHER]

What I'd do is flip the 97 motor and trans into the 98 car. Then get ahold of a 98 GTP pcm. Everything will plug in except the map sensor and the boost control soleniod. Pull out a solder gun and move the map sensor to the back and the correct connector, then add one wire to the harness if you want the BCS. If not..allow vacuum to control it.

You will also need to swap the passenger side axle from the GTP, as it's a little shorter for the HD transmission.

As for the vacuum being different on 97 vs 98-02, it's so little of a difference. 97 has a vacuum tree on the charger that feeds the bcs and fpr. On 98+ it's all from the port under the snout.

So it is recomended to swap in the hd trans as well then? I know for a fact that my non hd trans in my gt has never been beat on and I know that it shifts great and still has a lot of life left in it and with a shift kit, should last even longer. So is it worth it to find out the hard way if the hd trans in the gtp is any good by putting it in my car? or do the benefits outweigh the risk..

[CODFATHER]

How much does it cost for a kit to build up a 4t65e to hold a decent amount of power without shattering like glass? I never had a single issue in my 04 gtp comp g and i beat that crap out of that thing. It was a blast to drive

[BillBoost37]

Then you know how much it costs. These transmissions can do very well behind a stock motor and sometimes they don't. To build them...all depends on what you'd like to do. An input shaft by itself is $425-450 for one that you should never break.

You could make your trans HD by swapping the diff, diff cover and right axle. Then you'd have 3.29 gearing and would want to reprogram the pcm for that change and the difference of the fuel pump speeds etc.

[CODFATHER]

I think im just going to go with the whole swap then in that case. stick with the hd trans... which btw i found out is actually a zzp rebuilt trans and has a ton of life left in it.
What about the suspension? Does the gtp have a tighten more sports-like suspion? My gt feels a little squishy around corners whereas the gtp feels nice and tight

[dsmuts]

Just swap the whole subframe suspension and all.

[CODFATHER]

Just swap the whole subframe suspension and all.

Good call man! Will make life so much easier lol. Might as well paint it while its down too
Supercharger blower is off to be powder coated and so are a bunch of other miscellaneous pieces (dogbones, bolts, brackets etc..)
Can't wait to put this thing back together!

[CODFATHER]

Ok so im working on the swap right now and I have no idea what to do from here... My stumping point is that since my car is a gt and im putting the entire gtp drivetrain, wiring harness and pcm in my gt.. then how do i get the performance shift button to work now.. and also what about the boost gauge on the dash? I don't have that on my dash display. It has everything else but no boost gauge. And what about traction control off switch? will that still work?

[CODFATHER]

Please if someone can help asap that would be very appreciated!