Is there any company working on performance upgrades for the 6f55?
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Not really, no.
There was/is a shift kit type of upgrade which is essentially for the valve body.
Circle D also made a torque converter upgrade, but it netted slower times in the 1/4 (to approx .6 slower) which after re-tuning, only gained back .3
There is an individual who was/is attempting an improved aftermarket driveshaft as well, but has not been having much luck as of his last posting(s).
That's about it in a nutshell.
I have personally talked to two shops. NoVA Speed Shop in Manassas, VA and additionally I have spoken to LMS about it as well...
NoVA SS after looking over my car said that it would take time to reverse engineer the Ford setup, figure out which parts are weak, rebuild, attempt to break it, rinse, and repeat. Initial cost was $10K (iirc) on the low end just to start and an open ended time frame... they suggested about a year worth of R&D....
LMS said they would refer me to the transmission shop that built the drive train for their Ecoboost Mustang...but that they were not actively looking into anything on the transmission side.....
From what I understand is that basically the market is too small to get a return on the investment so who ever does it will foot the entire bill with no help from the shops... it would basically be for personal gratification and for a love of the platform.... it would be cheaper to get another platform and start with a setup that has all the parts readily available...
That said... I am hoping to have my car over at LME towards the end of the year (stock market willing!) and will investigate this further...
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For those of you putting down big power numbers, what parts failures are you having in the transaxle? If memory serves me correctly, the most common failure we had in the fleet with the 6F50/55 series was related to an aluminum parts shear in the direct clutch hub and associated snap ring. I've read over and over that the transaxle is the weak link but I don't recall anyone stating exactly what part broke. Generally speaking there's not a lot to it. At the minimum I'd like to find out if it's the torque converter, internal transmission hard parts/clutches, or final drive components unless you're breaking the case. While none of it is probably easy or cost effective to remake, if there's known weak points they may be able to be improved on by heat treating/tempering, welding steel internal parts and splined parts. Also plenty of torque converter rebuilders. Can anybody elaborate on what's breaking root cause failure item?
I found an old post that I have pics in over at the SHO forum
https://shoforum.com/index.php?threads/arggggg-dredded-p0756.134215/
The GM version of our transmission is the 6t70-80. Someone was looking into it to possibly swap out the internals as they are rated higher than ours.
I wouldn't mind some transmission strengthening upgrades myself, but it seems it'd be lost in the PTU anyway.
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Quote from: NITSOOB on August 07, 2018, 03:06:33 AM
The GM version of our transmission is the 6t70-80. Someone was looking into it to possibly swap out the internals as they are rated higher than ours.
http://gmauthority.com/blog/gm/gm-transmissions/mhm/ (http://gmauthority.com/blog/gm/gm-transmissions/mhm/)
With that Max torque rating, it is not a viable option. I am already putting down 430 to the road...or dyno rather...
https://d2q1ebiag300ih.cloudfront.net/uploads/tech_resource/file/556/Sonnax_6T70_6F50_Webinar.pdf?v=1485192581
interesting product booklet
Quote from: BigPlaySlay on July 22, 2018, 04:26:31 PM
Is there any company working on performance upgrades for the 6f55?
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Yes actually this company sells upgraded 6f55 trannys and except cores
https://spprecision.com/products/6f50-6f55-transmission-sale.html
Sonnax has the ZIP kit already, so I wonder what changes to the converter these guys have made.
Pretty cool to see something being offered upgraded trans wise, but I also wonder what parts were upgraded.
Quote from: ToMang07 on August 07, 2018, 10:08:37 AM
I wouldn't mind some transmission strengthening upgrades myself, but it seems it'd be lost in the PTU anyway.
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why would this be the case?
is because the old Cadillac XTS had more hp than the SHO?
wasn't the XTS the only transversed platform that used GM's 3.6 TT?
thye SHO/MKS was usually faster than the XTS in testing (by like a tenth but still).
Ford also used their 3.5 TTDI in the Explorer, while GM did not use their 3.6TT in their large SUVs.
so i don't see why the GM trans would be the stronger trans necessarily.
Quote from: MeanKS on February 10, 2019, 02:14:18 AM
Quote from: ToMang07 on August 07, 2018, 10:08:37 AM
I wouldn't mind some transmission strengthening upgrades myself, but it seems it'd be lost in the PTU anyway.
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why would this be the case?
is because the old Cadillac XTS had more hp than the SHO?
wasn't the XTS the only transversed platform that used GM's 3.6 TT?
thye SHO/MKS was usually faster than the XTS in testing (by like a tenth but still).
Ford also used their 3.5 TTDI in the Explorer, while GM did not use their 3.6TT in their large SUVs.
so i don't see why the GM trans would be the stronger trans necessarily.
It's simple....they aren't stronger.
Quote from: 18SHO on February 09, 2019, 09:34:43 AM
Quote from: BigPlaySlay on July 22, 2018, 04:26:31 PM
Is there any company working on performance upgrades for the 6f55?
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Yes actually this company sells upgraded 6f55 trannys and except cores
https://spprecision.com/products/6f50-6f55-transmission-sale.html
Anyone step up and give this a shot? I'm curious. I have a Xsport that I want to play with but I need a good trans.
Any one try this or any transmission upgrades/improvements?
On the EcoBoost PerformanceForum on Facebook, there was some talk about transmissions for the transverse models. Someone suggested that the new 8 speed from the edge might work because the 2.7 uses the sam trans (6peed) as the 3.5.?
Is there any truth to it?
Assuming it works there is the PCM issue now of getting it to talk?
I guess my question is why do you think you need a different transmission. There 6f55 isn't bad per say and I haven't seen anybody explode one from power unless they were 600awhp+
Mine has almost 131k on it with an ungodly amount of quarter mile passes on it. Gearhead makes upgraded torque converter if that means much. Also a buddy of mine built his i.e. bigger snap rings and cryo treated everything etc etc
I suppose if an adapter can be fabricated for the 2.7 version of the 6f55, you could try. Nothing wrong with the 6f55 in the SHO/transverse platform tho, anymore than for the 2.7. And the 2.7 has yet to hit the power levels the 3.5 has.
I was considering this when I was having transmission issues.
http://smartpartsauto.com/automatic_transmission_6f50.html (http://smartpartsauto.com/automatic_transmission_6f50.html)
The price seems too low to be a true upgrade :(
Prolly a used rebuild with an upgraded valve body? So it seems to be better til it craps out.
Quote from: Jordan on September 05, 2019, 03:21:22 PM
I guess my question is why do you think you need a different transmission. There 6f55 isn't bad per say and I haven't seen anybody explode one from power unless they were 600awhp+
Mine has almost 131k on it with an ungodly amount of quarter mile passes on it. Gearhead makes upgraded torque converter if that means much. Also a buddy of mine built his i.e. bigger snap rings and cryo treated everything etc etc
Presently there is no issue with my transmission. I am also not running a tune yet but I'd like to get it to 550 at the wheels. Thats what my jeep had and it was tons of fun to drive (Now the jeep has way more). If I'm at 550hp at the wheels for me that too close to the 600hp mark for comfort.
Once I do get my Xsport modded tuned it will be just like my SHO was. DPs, 3 bar, 93 tune. Thats not going to stress the transmission to much. But again I'd like to get it get to 550hp for the driving experience. I just want reliably to go a long with it.
My Jeep is running an estimated 700-750 hp. The transmission is rated at 1300hp. Not anywhere near it but I know the transmission it solid.
Has anyone explored a sequential dogbox as a trans replacment? I was thinking about contacting Quaif and asking if they can clone a 6F55, including linkage for a PTU, as a means of beefing up the drivtrain, (not to mention the obvious fun and performance factor)...
I'm sure Quaif would realize the limited number of people that would upgrade and charge you accordingly, likely over 10 grand if not more.
Quote from: autobahn terror on September 13, 2019, 10:03:51 AM
Has anyone explored a sequential dogbox as a trans replacment? I was thinking about contacting Quaif and asking if they can clone a 6F55, including linkage for a PTU, as a means of beefing up the drivtrain, (not to mention the obvious fun and performance factor)...