I got to thinking about it and i am not sure why it didn't dawn on me before. But eventually we will get title for the car, but it is a 2000 ish caddy ( I will try and get some pics tomorrow) but power wise would be about where the modded 6 is now and would be stock. Weight would be similar and the trans would be better to. ( 4l80e if i remember correctly) and would have that cool v8 sound. I know parts ( ESP performance) are slim but at the decent power levels stock I wouldn't see the need for more.


I would have the whole car so pcm wires ect. Would all be available.

Thoughts, ideas, opinions ????????


And





commence!



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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

northstar wile a great engine has basically jack and squat in terms of aftermarket support and the little they do is expensive

the easiest way I can think of to swap it in is to get the mounts and wiring out of a newer Buick Lucerne(sp) they are a w-body platform car and had the N* as an option I think need to double check

other option is to get an intrigue with a shortstar 3.5L v6 the engine mounts should be able to be adapted to its big brother


then you have another issue the transmission. a 4y65 would work in threory becuase the 3.5L shortstar used it but every single N* used had a 4T80 installed and probably for a good reason. IF the Lacern does indeed have a N* engine then swapping in a 4t80 should be easy if not then you will have to try to adapt one or pray the 4t65 can hold up (lol)


I really would not bother though the 3.8 can make more power for cheaper just do to the aftermarket and plus the 4/6L in the caddy probably only has 275hp

also biggest setback of all the PCMs are not unlocked and are expensive to tune (HP tuners does not support them) witch you will need to be able to do for it to work in a GP. cheapest mail order (only way) is $300

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

The northstars in the bonnevilles used a 4L80E im pretty sure. Is this the 4.0 northstar your talking about swapping in? Because the ones in the 96-99 aurora's had all sorts of problems. The 3.8's are easier and cheaper to mod. Also factor in gas mileage and the 3.8 is better all around. Although you dont have the v8 sound i think with a set of borlas and some tips you can get a good sounding v6, and for the cost of mufflers and tips its gunna be cheaper than an engine swap.

But if you were to keep the 97 and swap the northstar and tranny into that. Think about it, the northstar makes decent power, you need a different tranny in the 97 anyways and then you could sell the motor to recoup some of the costs from the swap. I would say swap the 40th into a northstar, but thats a perfectly good DD

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DIY intake-HV3-3" catless dp-180 tsat-DIY shift kit-murphy custom tune

4.6 and 4.0 are the exact same thing for problems all northstars suffered fromt he same head gasket and head bolt thread issues not just the 4.0

and a bonni is a H-body not a w-body so using a bonni for mounts or parts would not work

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

The trans from the 4.6 N* bolt up to a 4.0 N* though. And i dont think ot would be too hard to make mounts for it. But the wiring is different, and i dont know if the bonni gxp's came with tap-shift or not. That would cause another problem. There was a guy that swapped a 4.0 N* into his coupe on youtube. If you could find him im sure he could help out whatever you decide to do. What kind of numbers are you running on your current setup? Its gotta be more than 300 BHP which is what the STS is rated at. wouldnt seem logical to swap in a less powerful motor with hardly any aftermarket.


And tom can you please spell some more words correctly? I know you can speel right beause ive seen you do it in heated discussions. It just took me awhile to figure out some of your words that all. LOL

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DIY intake-HV3-3" catless dp-180 tsat-DIY shift kit-murphy custom tune

Well like I said it would be a complete car so motor trans wires pcm all at my disposal. The car is 2000 ish or newer dts or dhs don't remember. And i figure it would be about the same power I am making now possibly a little less torque it would just do it easier. I could get the car for so cheap that even after i get everything off that i would want or need I would scrap and part the rest and either make money or just put that into upgrade. Like the $300 head stud kit to eliminate that issue.

As for car, the 97 will get the trans from the se and get sold to pay for the small loan I got for the 40th, so logic says put it in the coupe.

I figured mounts wouldn't be to bad. I would just see what the caddy has and modify or Fab something up. Other feat I see would be routing stuff for the gauges and such. But GM to GM should be able to modify pin out and make something work at worst. Axles would be my next worry, and being GM again I am thinking swap stubs or bearings if they are different.

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

Like I said the 4.0 and the 4.6 are the exact same only difference is the bore sizing. they use the same harness. Also the 4.0 was only in the aurora and the Shelby series 1 supercar

Being a DTS it is the 275hp and 280ft-lbs version of the engine

Having a complete car will not help at all with this swap as none of the mounts will bolt to a GP absolutely none. You can use half of them the part that bolts to the trans but the part that bolts to the car will have to be fabricated. axles would be way to long and the splines will not fit in a GP knuckle.


it is a huge step backwards if it would be going into the coupe. with the XP set up it should be around 320 crank seeing as I dynode 277 wheel the N* only has 275 crank





I got a new keyboard and the letter spacing is different and pissing me off lol

going to through my posts into word for a bit

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

make a rail buggy haha, as much as i love caddys they were slow, my STS 303hp 285trq got stomped on the regular, it was simply to heavy and didn't have the trq numbers to make it giddy up, nice interior and you'll look like a boss in it depending on what your DHS/DTS looks like lol put the 3800 in it jk jk, good luck on whatever ya do though, can we call it a pontilac?

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BRAP BRAP BRAP nuff said

well i never did get a pic of the car the best i got was an old pic that i took of a caviler and the caddy was in the background. i was gonna get one but the celing decided to fall in on my (quite literally) yesterday afternoon so i had a hell of a mess to clean up and a large whole to plug up. ) i will post pics of that mess after i get the pics off my camera and on my phone, sometime after work.


the caddy is the one smashed in the front.. it ran into the back of a semi trailer.



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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

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Behold the majestic beast as it strides

Didnt he put a procharger on that car???? I know i seen one somewhere that was a procharged northstar swapped 5speed.

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i thought the same thing..

i wouldnt want to dump that much money even if i did do it, but i am doubting i will, but it dawned on me that the option was there to do it.

-- Thu Dec 29, 2011 8:10 am --

even at a little slower there is just something about a v8 dd gp that still makes me think about it. besides it would have something that most 97-03 gp's dont have.. v8. and with that comes the v8 sound. and the title that comes with being one of very very few to have done so. and if it was missed, i like to be the odd ball.

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

If you love 9 qt oil changes, why not?

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6