transmission and PTU

[Txstrmhntr]

Looking at part numbers and various things ive discovered the GM 6T75 and the ford 6F55 are almost the same transmission codeveloped by GM/FORD. So.... the question, since the 6T80(mildly upgraded 6T75) and haldex PTU in the XTS-Vsport  are rated by GM to take more HP/TQ than the ford setup, could we use the GM parts (IDK if it will just bolt in) but looking at tranny internals and what not it seems we could at minimum rebuild the 6F55 with 6T80 internals without issue. And if the PTU is better maybe it would be close to a direct swap or mild machining involved to use it.

Not that we really need it as noone has really broken the system yet, but some of us are aiming for higher and higher hp/tq eventually we will see the threshold limit on these components and something even slightly more robust may be of value.

[BiGMaC]

Looking at part numbers and various things ive discovered the GM 6T75 and the ford 6F55 are almost the same transmission codeveloped by GM/FORD. So.... the question, since the 6T80(mildly upgraded 6T75) and haldex PTU in the XTS-Vsport  are rated by GM to take more HP/TQ than the ford setup, could we use the GM parts (IDK if it will just bolt in) but looking at tranny internals and what not it seems we could at minimum rebuild the 6F55 with 6T80 internals without issue. And if the PTU is better maybe it would be close to a direct swap or mild machining involved to use it.

Not that we really need it as noone has really broken the system yet, but some of us are aiming for higher and higher hp/tq eventually we will see the threshold limit on these components and something even slightly more robust may be of value.

Definitely worth looking into... I have spoken with Dan Millen and he feels that about 450WHP is the limit for avoiding excessive chances of tranny/PTU premature failure... Although Mike has been above 500WHP for some time w/o problems so far.

[FoMoCoSHO]

Looking at part numbers and various things ive discovered the GM 6T75 and the ford 6F55 are almost the same transmission codeveloped by GM/FORD. So.... the question, since the 6T80(mildly upgraded 6T75) and haldex PTU in the XTS-Vsport  are rated by GM to take more HP/TQ than the ford setup, could we use the GM parts (IDK if it will just bolt in) but looking at tranny internals and what not it seems we could at minimum rebuild the 6F55 with 6T80 internals without issue. And if the PTU is better maybe it would be close to a direct swap or mild machining involved to use it.

Not that we really need it as noone has really broken the system yet, but some of us are aiming for higher and higher hp/tq eventually we will see the threshold limit on these components and something even slightly more robust may be of value.

Definitely worth looking into... I have spoken with Dan Millen and he feels that about 450WHP is the limit for avoiding excessive chances of tranny/PTU premature failure... Although Mike has been above 500WHP for some time w/o problems so far.

So 600 at the crank......

I feel like that will get me as far as I want to go with this car.

Of course that is subject to change but since this will most likely end up being High Command's car when I move into the next gen, there's only so far I'm willing to go.

That being said, I would like to get to the 11 sec club before it's all said and done...

Great idea from TXSTRM though.

Anybody modifying the GM tranny in the aftermarket world?

[Txstrmhntr]

Ok ive looked a little deeper from what ive found now the GM tran and Ford Trans are 100% identical down to the case molding, only difference is FoMoCo uses there own solenoids, and the final gear ratios are different than the GM cars, but its 100% mechanically the same. in other words you could bolt a 6T80 Gm trans straight up to a 3.5L ecoboost and only thing youd have to change are the shift solenoids.

[BiGMaC]

Looking at part numbers and various things ive discovered the GM 6T75 and the ford 6F55 are almost the same transmission codeveloped by GM/FORD. So.... the question, since the 6T80(mildly upgraded 6T75) and haldex PTU in the XTS-Vsport  are rated by GM to take more HP/TQ than the ford setup, could we use the GM parts (IDK if it will just bolt in) but looking at tranny internals and what not it seems we could at minimum rebuild the 6F55 with 6T80 internals without issue. And if the PTU is better maybe it would be close to a direct swap or mild machining involved to use it.

Not that we really need it as noone has really broken the system yet, but some of us are aiming for higher and higher hp/tq eventually we will see the threshold limit on these components and something even slightly more robust may be of value.

Definitely worth looking into... I have spoken with Dan Millen and he feels that about 450WHP is the limit for avoiding excessive chances of tranny/PTU premature failure... Although Mike has been above 500WHP for some time w/o problems so far.

So 600 at the crank......

I feel like that will get me as far as I want to go with this car.

Of course that is subject to change but since this will most likely end up being High Command's car when I move into the next gen, there's only so far I'm willing to go.

That being said, I would like to get to the 11 sec club before it's all said and done...

Great idea from TXSTRM though.

Anybody modifying the GM tranny in the aftermarket world?

Why not have a DD tune and a hotter race tune to get that 11.xx sec time! 

[FoMoCoSHO]

Looking at part numbers and various things ive discovered the GM 6T75 and the ford 6F55 are almost the same transmission codeveloped by GM/FORD. So.... the question, since the 6T80(mildly upgraded 6T75) and haldex PTU in the XTS-Vsport  are rated by GM to take more HP/TQ than the ford setup, could we use the GM parts (IDK if it will just bolt in) but looking at tranny internals and what not it seems we could at minimum rebuild the 6F55 with 6T80 internals without issue. And if the PTU is better maybe it would be close to a direct swap or mild machining involved to use it.

Not that we really need it as noone has really broken the system yet, but some of us are aiming for higher and higher hp/tq eventually we will see the threshold limit on these components and something even slightly more robust may be of value.

Definitely worth looking into... I have spoken with Dan Millen and he feels that about 450WHP is the limit for avoiding excessive chances of tranny/PTU premature failure... Although Mike has been above 500WHP for some time w/o problems so far.

So 600 at the crank......

I feel like that will get me as far as I want to go with this car.

Of course that is subject to change but since this will most likely end up being High Command's car when I move into the next gen, there's only so far I'm willing to go.

That being said, I would like to get to the 11 sec club before it's all said and done...

Great idea from TXSTRM though.

Anybody modifying the GM tranny in the aftermarket world?

Why not have a DD tune and a hotter race tune to get that 11.xx sec time!

So what you are implying here is one tune for me, another for High Command.

Methinks she might find that offensive, LOL...

[SHOnUup]

Following

Rich

[SHOnUup]

https://youtu.be/Tbs9TeS6Qxo

Rich

[SHOdded]

Interesting find.  See the Quattro system also on the sidebar.  Looks like a space station or satellite coming together

[markssho]

Great info and interesting read! Thanks

[AJP turbo]

Been a few months since I read it but certain GM versions of this tranny have an even more aggressive final drive. I'm thinking like 3.27 or something....I was thinking it would be a fairly easy swap and just a matter of changing the part and tune adjustments for gearing....Easy if you do tranny work but bolt in nonetheless.....I'd like to know for sure though

[SHOnUup]

There's a couple long discussions going on about this on "ecoboosted" Facebook page.


Rich

[13-SHO]

I work with one of the engineers who was on the Ford/GM team. They are basically identical but as mentioned. Programming and ratios are different. They are strong transmissions. He did share one little tidbit I found interesting. The HD versions had to add more exterior ribbing on the transmission housing reinforce it. Apparently the case "grows" quite a bit under load due to the hydraulic pressure and load.

[Txstrmhntr]

I work with one of the engineers who was on the Ford/GM team. They are basically identical but as mentioned. Programming and ratios are different. They are strong transmissions. He did share one little tidbit I found interesting. The HD versions had to add more exterior ribbing on the transmission housing reinforce it. Apparently the case "grows" quite a bit under load due to the hydraulic pressure and load.

lol ask him if the new GM trans is stronger than the 6f55

[13-SHO]

I work with one of the engineers who was on the Ford/GM team. They are basically identical but as mentioned. Programming and ratios are different. They are strong transmissions. He did share one little tidbit I found interesting. The HD versions had to add more exterior ribbing on the transmission housing reinforce it. Apparently the case "grows" quite a bit under load due to the hydraulic pressure and load.

You won't like his answer lol. He works for GM so he might be biased

lol ask him if the new GM trans is stronger than the 6f55