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  1. Installed a Tremec Magnum XL in my S550

    With HPTuners and the Abbott box, this is what happens. VSS was set at 34 (and it is normally set at 34.0058). We then changed it to 12. Speedo, didn't change. I have not had a chance to disconnect the power from the abbot box and give it a try. Regards, Dave
  2. Installed a Tremec Magnum XL in my S550

    @Ruiner46 Thank you for the information. From what I've seen the new gear ratios have been entered in and the VSS is set to 12. But I do believe that the Abbott box is fully connected (as I am not sure 100% how it is connected, but it does look like that the power is connected). I'll pass...
  3. Installed a Tremec Magnum XL in my S550

    So I have noticed that I'm off by a few mile per hour. Not much, just a few. And obviously at higher speeds the variation is much bigger. I'll see if I can go the next step up with the dip switches. As for what gear its in... I have no idea.
  4. Installed a Tremec Magnum XL in my S550

    Hello Everyone. I've been following this thread for sometime now. Thanks to everyone for all the info and @db252 for sharing all the pains as well. On my swap I have the Abbot box. And I am having issues with getting cruise control setup. While I did not do the swap. I'd like to know if the...
  5. Florida SCT BDX tuner unmarried w/ Boomba Sound Tube Delete

    It means that the device is "Married" to a Vin or locked to it.
  6. GT Sold: SCT x4 Unmarried, with 5 unlocks.

    SCT x4 Unmarried, with 5 unlocks. PN 7015 (Ford) 300.00
  7. Hellion turbo kit experiences ?

    One of the things to remember is emissions. Where you live and what are the requirements. Is this going to be your daily driver or is it going to be something just used for the track. Regards...
  8. o2 and o2 heater not checking in.

    So, one would think @AceS550 I've done a little research and found that a stock tune has it off. There are several other settings within a stock tune that seem really not attainable. the Delta V for RPM is 150, and the Delta V for speed is 9 mph. While I see it possible to keep the car...
  9. o2 and o2 heater not checking in.

    Hello All, So this has been a "Thing" for me. The short of it is, I've had to add Cat's back on to the car to get it to pass emissions. Right now I am trying to get the Oxygen Sensor and Oxygen Sensor Heater to check in. They show as incomplete. Everything else has checked and shows good...
  10. I want to go from 3:55’s to 3:15 gears.

    If you're still looking for a set of gears let me know.
  11. Highest mileage s550!?

    14k in 1 year. It is my daily. 650hp, and it is my daily. Absolutely love it.
  12. Installed a Tremec Magnum XL in my S550

    The username your looking for is not ab252 but db252. Assuming that is. :)
  13. Installed a Tremec Magnum XL in my S550

    I have already been told a couple times that a carbon fiber driveshaft might be better.
  14. Installed a Tremec Magnum XL in my S550

    @db252 and anyone else. What driveshaft are you using? Also it sounds like I am one of the few that has to shim. IE: carbon fiber, steel or chromoly?
  15. Installed a Tremec Magnum XL in my S550

    @db252 Not sure what this means... If you could explain any of it... It would be helpful.
  16. Installed a Tremec Magnum XL in my S550

    @db252 Any thoughts on shimming the rear end/frame instead of the transmission?
  17. Installed a Tremec Magnum XL in my S550

    New vibration after install... The answer… Check the driveline angle. Too much angle can cause vibration. Fix? Shim the top of the transmission. Now the story… I recently had the swap from the MT82 transmission to the Tremec T56 Magnum XL in my 2015 Ford Mustang GT. I did not do the...
  18. Rear Diff, Pinion Gears. And what will hold.

    @whatsup62 Thank you for the info and input. Looks like I'll be going with the 4.09's as well. Dave
  19. Rear Diff, Pinion Gears. And what will hold.

    Hello All, I am looking for some input. I currently have a 2015 GT PP, that makes around 800 hp. The MT82 is being replaced with a T-56 Mag XL. The current rear is a 3.55, and the clutch is being changed up to support the HP, as is the drive shaft. The haft shafts will be done with the rear...





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