LS4 Performance - need help with GTP trans

I know there isnt a section for L67s but thought I would give it a shot here.
97 GP GTP GM reman trans has gone out for last time(5x)
no more GM warranty. so I want a cheap good one so the car can be babied and last a little while longer(last babied GM reman lasted 8K,which is real sad).
Anyway I found a G6 in local yard thats a GTP 3.9 and wondering whats involved in adapting that trans.
I know I need to change the following:RH axle,trans range selector(Pringle switch),cooling line fittings.
The G6 trans isnt a HD but I can live with that.
Question is the bolt pattern on the 3.5/3.9 same as the L67 3.8?

You may have the same problem as my GP had. I had to have it rebuilt 5x before a Ausi found the problem. He rebuilt the trans all HD parts the problem was the line going threw the radiator was clog so no cooling happening had to replace the radiator. The trans has been ok for 6yrs.

GM remans are junk thats the problem.These trans were overrated and add boost to that and its instant shrapnel.

Anyone know if the bolt pattern on a 3.9 is the same as old BOP pattern thats been around for centuries?

GM remans are junk thats the problem.These trans were overrated and add boost to that and its instant shrapnel.

Anyone know if the bolt pattern on a 3.9 is the same as old BOP pattern thats been around for centuries?

The 3.9 has the same bellhousing as all the 3800SC's, 2.5, 2.8, 3.0, 3.1, 3.4, 3400, 3500, 3900, 4.1/4.5/4.9 caddy V8's and the LS4, but it isn't called the BOP pattern.

The 3.9 has the same bellhousing as all the 3800SC's, 2.5, 2.8, 3.0, 3.1, 3.4, 3400, 3500, 3900, 4.1/4.5/4.9 caddy V8's and the LS4, but it isn't called the BOP pattern.

OK thanks
Well since the "O" and "P" are gone from the "BOP" I guess its just called "corporate" bolt pattern?
If youre sure the 3.9 is same I think Ill snag the trans and maybe motor too.

The 3.9 has the same bellhousing as all the 3800SC's, 2.5, 2.8, 3.0, 3.1, 3.4, 3400, 3500, 3900, 4.1/4.5/4.9 caddy V8's and the LS4, but it isn't called the BOP pattern.

Do you think they were stuck with the same tranny or no imagination.

what is done to the car?

Since the last GM reman only a CAI and 3"DP and duals
Even the one before that we took the 3 inch pulley and tuned PCM
off and it still didnt last.DRs nor track time havent been done since #3
Quote Mels SS
Do you think they were stuck with the same tranny or no imagination.

Not sure what you mean by this
the 3.6 high feature has a weird bellhousing and it came out at same time the 3.9 high feature did.

i would say check what mel said cause even my trans in my old GTP lasted longer than that and i didnt baby it at all

We have and dealer has thanks

Dont know why I didnt think of this before but theres an article on GP forum that a guy put a F40 6 speed out of a 3.9 G6 GTP behind his 3.8 L67.
If the trans bellhousing was same on it ,it would be same on the auto.Duh

Since the last GM reman only a CAI and 3"DP and duals
Even the one before that we took the 3 inch pulley and tuned PCM
off and it still didnt last.DRs nor track time havent been done since #3
Quote Mels SS
Do you think they were stuck with the same tranny or no imagination.

Not sure what you mean by this
the 3.6 high feature has a weird bellhousing and it came out at same time the 3.9 high feature did.

No just all the same bell housing and very little improvement over the years still the week link in all FWD Wbodys

someone needs to make/ build a trans for our cars. i think there would be a huge list of people wanting a good tranny. i know TEP does but they are still a weak point

OK thanks
Well since the "O" and "P" are gone from the "BOP" I guess its just called "corporate" bolt pattern?
If youre sure the 3.9 is same I think Ill snag the trans and maybe motor too.

The BOP pattern is the RWD pattern used from the 60's into the mid 80's on Buick, Olds and Pontac when those brands build their own engines (there were a few longitudinal FWD setups with this bellhousing using the HT425 & HT325) . It shares the same dowel pin locations as the SBC/BBC pattern and a couple of holes.

The GM METRIC pattern is common to most FWD transverse applications (excluding the Q4, Ecotec, Saturn, N*/Aurora and the new High Feature V6) dates back to the RWD 2.5 and 2.8 v6 applications. It was designed around a 142 tooth ring gear and smaller flywheel (most likely for weight savings/fuel economy). It shares nothing with the BOP pattern and was probably the first metric bellhousing pattern within GM domestic (probably how it got its name).

http://en.wikipedia.org/wiki/List_of_GM_bellhousing_patterns#GM_4-cylinder_pattern

I bought the engine /trans(06 G6 GTP)
now just need to figure out what I need
to swap out with the 97 GP GTP trans to make it work.

Anyone put a tapshift trans in a non tapshift car and operate in just the auto mode?

And to the OP...don't reinstall the b1tch bolt...its a backwards bolt in the bell housing that you basically have to run a 2+ foot extension through the passenger side wheel well to most easily access it. It doesn't need it for the re-install.

Dont know why I didnt think of this before but theres an article on GP forum that a guy put a F40 6 speed out of a 3.9 G6 GTP behind his 3.8 L67.
If the trans bellhousing was same on it ,it would be same on the auto.Duh

There are plenty of 5 or 6 speed swaps...problem being, they destory axles like no ones business unless your willing to toss out the coin for built ones. His screenname is Kuntzie...at least his is the most popular one since it is a 550+ FWHP 5-spd turbo car.

someone needs to make/ build a trans for our cars. i think there would be a huge list of people wanting a good tranny. i know TEP does but they are still a weak point

I have a Triple Edge performance transmission...and let me tell you, it is anything but a weak point. Dave does great work and is a good friend of mine and I'd recommened his transmissions to ANYONE, even the RWD guys.

Anyone put a tapshift trans in a non tapshift car and operate in just the auto mode?

The wiring mess it involves and the fast basically every internal sensor is different, makes it pointless and impossible. Dave at Triple Edge has tried it and the PCM has to match the TAPShift transmission...and since you can't really use a '04+ PCM in a '98-'03 GTP, let alone a '97...just means get a built 4T65E-HD and be happy. I love mine...and its rated for some serious beating.

I may have to swap valve bodys then
theres alot of difference between a $150 used trans
and a $2500 one.
Im so poor I cant even pay attention.....
I did get the PCM along with all wiring and accessories but it wasnt my plan to use any of that,just trying to keep the package together.