transmission and PTU

[metroplex]

Does this mean we can use Dexron VI in the 6F55?

[glock-coma]

Does this mean we can use Dexron VI in the 6F55?

I'm pretty sure the 6F55 requires motorcraft LV



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[SHOdded]

Valvoline's MaxLife ATF is both Dexron VI and Mercon LV compatible.  BUT it is not OEM licensed, and any recourse would be through Valvoline directly.
http://content.valvoline.com/pdf/maxlife_atf.pdf

Castrol's TransMax DexVI MercLV product appears to be licensed for both specs, so that may be a better go to:
http://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/6012D45D5B60026F80257C40000798C9/$File/Transmax%20DEXRON%20VI%20MERCON%20LV_468179_2013_12.pdf

[ZSHO]

I prefer to do my trans fluid every 30k with only Motorcraft mercon LV.  Z [url=http://www.youtube.com/watch?v=JUBoXyQ7UDQ#]! No longer available]! No longer available  [url=http://www.youtube.com/watch?v=VMoTqPBIyGw#]! No longer available]! No longer available      Definitely like to add Amsoil or Redline to the mix for the PTU,RDU.  Z

[metroplex]

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.

[SHOdded]

Similar doesn't mean identical.  So if you choose to use a Dexron VI fluid, it must also clearly be spec'd for Mercon LV.

[metroplex]

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.

Unless the solenoids themselves really absolutely need Dexron VI or Mercon LV...

[SHOdded]

Since solenoids are at the heart of the transmission, yeah, I would refrain from experimenting unless I had the funds and were willing to swap/rebuild.  Shouldn't happen quickly logically, but logic is based on known constraints.  Who knows the trans may even like it ...

[Cole.C]

Have been wondering if anyone has looked into this any further. Know I need a new trans shortly wondering if I bought a new 6t80 trans how difficult would the swap be. Hope to see this done eventually if the 6t80 is improved over the 6f55 in any notable way?

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[ToMang07]

Have been wondering if anyone has looked into this any further. Know I need a new trans shortly wondering if I bought a new 6t80 trans how difficult would the swap be. Hope to see this done eventually if the 6t80 is improved over the 6f55 in any notable way?

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+1....subbd

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[Cole.C]

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

https://www.sourceoneautoparts.com/24265608-6t80-transmission-6-speed-automatic-2014-16-cadillac-xts-vsport.html
Found these 6t80 trans at a decent price it says it's final gear drive is 3:16 which is the same as the 6f55 used in the police interceptor sedans which is what I'd be doing the swap in. If it did bolt right up with no issues and the wiring harnesses look the same but never know could be ever so slightly different but hoping not.  Would the car require a custom tune to be driven or if the final gear ratio is the same and ends up being easy as a OEM install would it be safe to drive the car atleast on a trailer to get it home to be messed if even nescessary?

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[glock-coma]

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

https://www.sourceoneautoparts.com/24265608-6t80-transmission-6-speed-automatic-2014-16-cadillac-xts-vsport.html
Found these 6t80 trans at a decent price it says it's final gear drive is 3:16 which is the same as the 6f55 used in the police interceptor sedans which is what I'd be doing the swap in. If it did bolt right up with no issues and the wiring harnesses look the same but never know could be ever so slightly different but hoping not.  Would the car require a custom tune to be driven or if the final gear ratio is the same and ends up being easy as a OEM install would it be safe to drive the car atleast on a trailer to get it home to be messed if even nescessary?

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Umm...that's a Cadillac (GM) trans.
I HIGHLY doubt it will bolt up.
Nor will the wiring harness match.

[Cole.C]

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

https://www.sourceoneautoparts.com/24265608-6t80-transmission-6-speed-automatic-2014-16-cadillac-xts-vsport.html
Found these 6t80 trans at a decent price it says it's final gear drive is 3:16 which is the same as the 6f55 used in the police interceptor sedans which is what I'd be doing the swap in. If it did bolt right up with no issues and the wiring harnesses look the same but never know could be ever so slightly different but hoping not.  Would the car require a custom tune to be driven or if the final gear ratio is the same and ends up being easy as a OEM install would it be safe to drive the car atleast on a trailer to get it home to be messed if even nescessary?

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Umm...that's a Cadillac (GM) trans.
I HIGHLY doubt it will bolt up.
Nor will the wiring harness match.

The cases look the same, bolt pattern looks the same as well as harness.. I'd have to order it and try to have it bolted up. set side by side you'd barely be able to tell the difference besides the 6t80's added case ribbing compared to the 6f55. but yes thanks I'm trying to buy and install a GM trans... even if I do have to have an adapter made or go through some weird pains I was quoted for the new 6f55 supposedly "at cost" for 1799 warrantied from the local stealership that loves to lie. I can get the 6t80 for 1299. Still could get an adapter made and a ever so slightly improved trans for less than the cost of the new trans Ford quoted me at..


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[bpd1151]

Found these 6t80 trans at a decent price it says it's final gear drive is 3:16 which is the same as the 6f55 used in the police interceptor sedans which is what I'd be doing the swap in.

PI sedans have the 3.39 axle.

PI utilities have the 3.65 axle.

You listed they have the 3.16

Just FYI.

[Cole.C]

Found these 6t80 trans at a decent price it says it's final gear drive is 3:16 which is the same as the 6f55 used in the police interceptor sedans which is what I'd be doing the swap in.

PI sedans have the 3.39 axle.

PI utilities have the 3.65 axle.

You listed they have the 3.16

Just FYI.

My bad! I must of gotten my info from a bad source. Pdf I downloaded with various police Dept. Vehicles showed 3:16 shows the 3:39 in the 3.7l?

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