GT Into a GTP coversion

[PrixBallin97]

hey, I have a few questions...
I just started working at brandys automotive...I have a stock grand prix gt with a blown engine...I was wondering If i got a GTP engine with the supercharger can i put that into a GT? I know so far that im going to need the GTP Trans and Computer...is there anything else im going to need?

[GTP Dad]

Fuel pump, wiring harness, axle shafts, possibly fuel lines and radiator.

[BNaylor]

I'd put double emphasis on wiring harness! It looks like you have a '97 L36 which was delivered with the older 4T60E tranny. The '97 L67 GTP was delivered with the 4T65E-HD. You can confirm by looking at the SPID label located on the back of the trunk lid. Look for M13 which is the RPO code for a 4T60E tranny. A 4T65E is M15 and 4T65E-HD is MN7. The wiring between a 4T60E and 4T65E is totally different. Therefore, you will need the complete main and engine compartment wiring harnesses. The problem will be getting it all connected properly and working. Doesn't look feasible to me.

BTW - It is not recommended to do a L67 conversion on a '97 model.

See link below for more info:

www.l67swap.com

[ericn1300]

thought this was a dead subject, dealt with this post

http://www.automotiveforums.com/vbul...d.php?t=368587

[BNaylor]

Originally Posted by ericn1300

thought this was a dead subject, dealt with this post

Dead subject? Now thats funny.

I don't see any problems with people posting looking for clarification on certain topics or issues that have been re-hashed over and over. Do you Lynn?

[GTP Dad]

Not really Bob as long as the members don't want a blow by blow description on how to do the job. Clarification is one thing complete details is another. Although it would be helpful if those members wanting to do this swap would read the sticky at the top of the page first!!

[BNaylor]

Originally Posted by gtpdad

It appears that a lot of forum members want to know if the L67 from a GTP will fit or can be adapted to the GT or SE. Many of you also want to know if the supercharger from a GTP can be placed on the non-supercharged 3.8. The answer to the question of whether an L67 will fit is yes. But you must change the PCM, fuel pump, and will need to put the 4t65e transmission along with a host of other parts to make it work.

As far as putting the supercharger on the non-supercharged engine, it is possible but you need to use the heads, lower intake, PCM and harmonic balancer from the supercharged engine to make it work. You should also change the fuel pump and will need the heavier transmission (4t65e) to handle the power.

I hope this answers the question for those who want to know!

Originally Posted by GTP Dad

Not really Bob as long as the members don't want a blow by blow description on how to do the job. Clarification is one thing complete details is another. Although it would be helpful if those members wanting to do this swap would read the sticky at the top of the page first!!

You know as well as I do that will never happen Lynn and there are those who will read the sticky and still require additional clarification. Thats what we are here for. Plus there are other resources where the person can be directed like L67swap.com which does cover the issue in detail. Just my two cents worth.

[richtazz]

that sticky is WAY to easy Lynn, it's better to ask ask ask, so we can 'splain, 'splain, 'splain, right Bob?

[richtazz]

so, can I put a GTP motor in my 99 GT?

[jessep28]

Or how about a Northstar??

[BNaylor]

Originally Posted by richtazz

so, can I put a GTP motor in my 99 GT?

Sure Rich. I'll help you free of charge as long as you provide the engine, parts, beer and food.

Sounds challenging.

[richtazz]

Let's convert it to rear drive and put a big block in it instead!!

[wlkjr]

Anyone ever ask if you can replace an L67 with an L36? And be nice to me, I didn't do a thorough search. The engine swap question must be kinda like the RV question someone always asks "can I drive with my propane on?"

[GTP Dad]

Alright guy I get your drift!!! Everyone likes to ask questions no matter how many times they are asked. And yes Rich the sticky is too easy although for a long time it worked now there appears to be a new group of members who are intent on doing this swap and want to hear from us old timers on how to do it! Personally I think Pontiac should have just made all Grand Prix's GTP's and then no one would have to ask questions about how to change a GT over.

As for the big block rear drive conversion I'm up for it! A supercharged 455 backed up with a TH 400 with full race package and a 3500 stall converter back to a quick change rear and a set of slicks would work real well. Of course none of us has a spare $60K in our back pocket to do the job.

As for changing an L67 to an L36 who on earth would want to do a swap like that. They would have to be two bricks shy of a full load to even consider it!

[BNaylor]

Originally Posted by wlkjr

Anyone ever ask if you can replace an L67 with an L36? And be nice to me, I didn't do a thorough search. The engine swap question must be kinda like the RV question someone always asks "can I drive with my propane on?"

Now thats funny. Interesting twist.

I've found myself to be in a unique situation. I can't speak for others. Whenever I want to see what its like owning or driving a L36 I ask my wife for the keys to her Regal LS. Its a L36. Plus it has a u-bend delete and a hi-flow CAT to boot. And if she wants to drive an L67 I give her the keys to my Regal GS. Of course, the L67 GTP is off limits. Now thats what you call an easy conversion.