Need advise from the OGs

[freestyler659]

So last month my newly acquired gt was making a loud whine going to the store, it was the trans pump. After barely getting home with trans slipping I parked it and I have no movement in ANY gear. Then if things couldn't get any worse my dog of 15 years was killed, had to sell my glock 21 to pay the vet $500. I sold the pistol for $600 and used the rest to get a trans from pick n rip, out of a 02 gtp that was rebuilt by lkq in 09. The windshield said runs and drives, plus it was t boned so I took the gamble. After four hours and almost collapsing (101° sunny day on the west coast) I had the 4t65e hd in the back of my jeep (minus tube and dip sick) with the free torque converter.

Now to the good part, a guy on cl is selling a 97 gtp for $600 it was t boned really bad. I hit him up and he said he would take $300 cash. I've got the cash now and will be going to pick it up today with $200 in my pocket. He got it for free so I'm pretty sure he'll take it.

Sorry for the life story but would you guys pull the 97 L67 and bolt it to the rebuilt trans and drop it in the $200 99 gt?

[BillBoost37]

You could.. Or you could put the trans in your car and smile that it works well.

[freestyler659]

True but I know the egr/hydrolocking problem exists with the L36. Not to mention it's got almost 280k miles on the original motor and trans. If I swap the trans I still have to buy a passenger axle and a tune. Then let's say 500 miles later it decides to swallow coolant, I'd be really angry. I'm the type of guy that does it once the right way. But I don't know how involved the swap would be. Fuel lines, wiring harness ect

[Scottydoggs]

if you mod the lim on any n/a 3800 it cant hydro lock ever again.

you could swap but its a bit more work, pcm wire harness from the donor car.

[Slick2500]

if you mod the lim on any n/a 3800 it cant hydro lock ever again.

you could swap but its a bit more work, pcm wire harness from the donor car.

I don't know if you can run a 97 PCM in a 99 even with the harness.

[BillBoost37]

I don't know if you can run a 97 PCM in a 99 even with the harness.

There's about a 13 wire difference to the pcm. But... I called Scott out on it and suggested using the 99 harness instead. It's very easy to mod a harness. Ask me how I know.

My 97 Bonneville had a 99 L36 harness that I modded for the firewall connector (would be relay center in a W body) to work. Ran a 99 pcm. At one point before I had a dhp I needed to have the correct vin, hence I made an adapter from 97 pcm to 99 wiring harness connector. It's a lot of wires to map, solder and hope you get right on the first try because you literally have one night to do it. FWIW I turned the key and it fired right up.

[freestyler659]

There's about a 13 wire difference to the pcm. But... I called Scott out on it and suggested using the 99 harness instead. It's very easy to mod a harness. Ask me how I know.

My 97 Bonneville had a 99 L36 harness that I modded for the firewall connector (would be relay center in a W body) to work. Ran a 99 pcm. At one point before I had a dhp I needed to have the correct vin, hence I made an adapter from 97 pcm to 99 wiring harness connector. It's a lot of wires to map, solder and hope you get right on the first try because you literally have one night to do it. FWIW I turned the key and it fired right up.

Well Bill it turns out it's a 98. I know I'll still have to mod the 99 harness and will pm you when that day comes but since it's only a year difference could I use the 98 pcm?

[Scottydoggs]

Well Bill it turns out it's a 98. I know I'll still have to mod the 99 harness and will pm you when that day comes but since it's only a year difference could I use the 98 pcm?

if its a 98 pcm from the gtp, and your car is a 99 you could flash a 99 bin to it and make it work with some tuning changes like the tranny if you keep the na tranny.

what im saying is you have two good pcm's now 98 and 99 will swap bins with no issue.

a 97 pcm is its own animal and can only be used for a 97.

if you ever figure out what way you want to go, pm me, i can make all them changes in the pcm for ya. you just need to ship me one of the pcm's.

[freestyler659]

Yeah I found that thread Scotty but between the girlfriend, rent and the other four projects I have currently I'm on a extremely tight budget. Just trying to do the cheapest thing without having to pull the motor a second time. Btw I will be using your how to remove a trans thread. Thanks a million it saved my butt getting that 02 4t65e hd

[BillBoost37]

Here's how/why it fails
http://www.grandprixforums.net/threa...hlight=failure

Here's now to keep it from ever happening
http://www.grandprixforums.net/threa...highlight=easy

[Scottydoggs]

modding a lim costs like 10 bucks or so tops.

[freestyler659]

Yeah I've been seeking around here since I got the car in July and seen all these. My plan was get a series 3 uim and a tb adapter but $100 for just the adapter? Might aswell get a L67? Right?

[Scottydoggs]

the intake swap is not worth doing at all on the n/a engines.

[freestyler659]

Thank you Scotty just saved me again!

[BillBoost37]

Scotty's how to remove a trans thread? Scotty...when did you do one?

If money is tight and you know your motor works fine, then stick with it and the good trans. You'll need a tune the min you start playing with mixing and matching. You also can't use a 97 engine harness w/o repinning some stuff on anything beyond a 97. Easy enough.. you just need to do the homework. And there's no reason to swap a harness when dropping in an SC motor. You can change the connector for map and add the bcs connector easier.

[Scottydoggs]

i think the brown names mixed him up, its bills tranny swap how to you read for sure lol.

[BillBoost37]

I might change the poster on all the how to threads to you. Would save me a lot of questions, and you know the answers anyhow..lol

[Scottydoggs]

please dont lol

[freestyler659]

My apologies to Bill It was your thread. So I can use the 99 harness with the 97 L67? But not the ecu? Or just send of the 99 ecu for a tune to run the L67? Sorry guys I work nights and I'm supposed to be sleeping

[BillBoost37]

Sleeping has nothing to do with this puzzle.. lol

If you are going to dump the parts into the 99 body. It's easiest to program the ecu to the SC motor and whichever trans you have than anything else.
In that tune, you'd have the 97 maf tables etc loaded in. Say you sent your ECU to Scotty. He'd bring whatever trans gear ratio in and load you up with a 97 L67 motor.

Then wiring wise, it's so easy to solder on the map connector and extend it to the sensor as the wire colors all match up on the map. And you'd pull the wiring to the BCS (boost control soleniod) from the 97 harness and add them to your 99 harness in the correct 99 positions.

Poof.. ECU and harness all done.