transmission and PTU

T

Txstrmhntr

New member
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.
 
Txstrmhntr said:
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.
Click to expand...

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.
 
BiGMaC said:
Txstrmhntr said:
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.
Click to expand...

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.
Click to expand...
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?

 
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.


 
FoMoCoSHO said:
BiGMaC said:
Txstrmhntr said:
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.
Click to expand...

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.
Click to expand...
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?
Click to expand...

Why not have a DD tune and a hotter race tune to get that 11.xx sec time! 
 
BiGMaC said:
FoMoCoSHO said:
BiGMaC said:
Txstrmhntr said:
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.
Click to expand...

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.
Click to expand...
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?
Click to expand...

Why not have a DD tune and a hotter race tune to get that 11.xx sec time!
Click to expand...
So what you are implying here is one tune for me, another for High Command.

Methinks she might find that offensive, LOL...
 
Interesting find.  See the Quattro system also on the sidebar.  Looks like a space station or satellite coming together :)
 
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
 
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.
 
13-SHO said:
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.
Click to expand...

lol ask him if the new GM trans is stronger than the 6f55
 
Txstrmhntr said:
13-SHO said:
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.
Click to expand...

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
Click to expand...
 
metroplex said:
Does this mean we can use Dexron VI in the 6F55?
Click to expand...
I'm pretty sure the 6F55 requires motorcraft LV
00a7423a49484c36bd19df38ac2725fc.png



Sent from my iPad using Tapatalk
 
That's what I figured, if the 6T80 and 6F55 are identical, and GM specifies Dex VI while Ford specifies Mercon LV, both fluids must be very similar.
 
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