Mustang 3.5L Ecoboost engine swap
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Joined: May 29, 2012
Posts: 791
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From: Westminster, CO
At least we figured out what our fuel pump problem was. One of the FPDM's was giving us real trouble. It primed the pump, but once the car was running the pump wouldn't supply fuel. Yesterday we switched over to the other FPDM and now the car runs perfectly. We never had that problem with the GT500 pump, as it has two pumps. So it may be that only one was running back then, which supplied enough fuel to drive around. At least one item less on the list to worry about.
LEXiiON
LEXiiON
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From: Drouin Australia
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Joined: May 29, 2012
Posts: 791
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From: Westminster, CO
LEXiiON
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From: Boulder
Like Father...
I ♥ Sausage
I ♥ Sausage
Joined: April 4, 2007
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From: Just outside the middle of nowhere
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Joined: July 10, 2015
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From: Boulder
Since I've never had a performance car with an auto I had to do some homework, here's what I learned.
Your auto choices for an ecoboost are
3.7 mustang 6r80
3.7 4x2 f150 6r80
3.5 4x2 f150 6r80
The 4x4 trans won't work, it's got a different output shaft. The v8 trans has a different bolt patter and will not work either. The 6r80 has less clutches in the 3.7 in both the mustang and f150, the 3.5 f150 auto has the same amount of clutches as the 5.0 & 6.2 in the f150. The mustang v8 6r80 has one additional separator plate over any of the f150 transmissions. 6r80 stands for 6 speed, RWD, 800 lbs of torque. The short version is make sure to get a 3.5 ecoboost f150 auto, just a little bit more expensive to buy used but probably worth the extra strength. I found a 17k mile transmission for $675, not bad.
Transbrake for the 6r80 is done electronically and only requires a plug in module, pretty cool. $200 for that.
Stall converters are available for the 6r80 but I don't see how it's really going to help, I think I'm going to run the stock unit and save the $1,100 for something else. The ecoboost makes good torque numbers at 1700 rpm and peak torque for modified ecoboost around 2500 rpm. The factory stall converter runs 2300-2600 rpm so that should work out pretty well. Since the car is lighter that rpm may come sooner but it's also making more torque than stock which I've read pushes the rpm a little higher before engaging.
I think a 3.7 mustang driveshaft will work, others have done this swap in v8s and haven't mentioned having to get a custom driveshaft made.
They did mention using a 6r80 from an f150 in a mustang requires a simple custom bracket to hold the shifter cable, the mustang trans comes with the bracket but the f150 doesn't. Looks like the trans mount is the same between f150 and mustang, all electrical connections are the same. There's a code on the side of the trans that must be loaded in to the PCM in order for it to work properly.
Your auto choices for an ecoboost are
3.7 mustang 6r80
3.7 4x2 f150 6r80
3.5 4x2 f150 6r80
The 4x4 trans won't work, it's got a different output shaft. The v8 trans has a different bolt patter and will not work either. The 6r80 has less clutches in the 3.7 in both the mustang and f150, the 3.5 f150 auto has the same amount of clutches as the 5.0 & 6.2 in the f150. The mustang v8 6r80 has one additional separator plate over any of the f150 transmissions. 6r80 stands for 6 speed, RWD, 800 lbs of torque. The short version is make sure to get a 3.5 ecoboost f150 auto, just a little bit more expensive to buy used but probably worth the extra strength. I found a 17k mile transmission for $675, not bad.
Transbrake for the 6r80 is done electronically and only requires a plug in module, pretty cool. $200 for that.
Stall converters are available for the 6r80 but I don't see how it's really going to help, I think I'm going to run the stock unit and save the $1,100 for something else. The ecoboost makes good torque numbers at 1700 rpm and peak torque for modified ecoboost around 2500 rpm. The factory stall converter runs 2300-2600 rpm so that should work out pretty well. Since the car is lighter that rpm may come sooner but it's also making more torque than stock which I've read pushes the rpm a little higher before engaging.
I think a 3.7 mustang driveshaft will work, others have done this swap in v8s and haven't mentioned having to get a custom driveshaft made.
They did mention using a 6r80 from an f150 in a mustang requires a simple custom bracket to hold the shifter cable, the mustang trans comes with the bracket but the f150 doesn't. Looks like the trans mount is the same between f150 and mustang, all electrical connections are the same. There's a code on the side of the trans that must be loaded in to the PCM in order for it to work properly.
Like Father...
I ♥ Sausage
I ♥ Sausage
Joined: April 4, 2007
Posts: 20,164
Likes: 643
From: Just outside the middle of nowhere
Since I've never had a performance car with an auto I had to do some homework, here's what I learned.
Your auto choices for an ecoboost are
3.7 mustang 6r80
3.7 4x2 f150 6r80
3.5 4x2 f150 6r80
The 4x4 trans won't work, it's got a different output shaft. The v8 trans has a different bolt patter and will not work either. The 6r80 has less clutches in the 3.7 in both the mustang and f150, the 3.5 f150 auto has the same amount of clutches as the 5.0 & 6.2 in the f150. The mustang v8 6r80 has one additional separator plate over any of the f150 transmissions. 6r80 stands for 6 speed, RWD, 800 lbs of torque. The short version is make sure to get a 3.5 ecoboost f150 auto, just a little bit more expensive to buy used but probably worth the extra strength. I found a 17k mile transmission for $675, not bad.
Transbrake for the 6r80 is done electronically and only requires a plug in module, pretty cool. $200 for that.
Stall converters are available for the 6r80 but I don't see how it's really going to help, I think I'm going to run the stock unit and save the $1,100 for something else. The ecoboost makes good torque numbers at 1700 rpm and peak torque for modified ecoboost around 2500 rpm. The factory stall converter runs 2300-2600 rpm so that should work out pretty well. Since the car is lighter that rpm may come sooner but it's also making more torque than stock which I've read pushes the rpm a little higher before engaging.
I think a 3.7 mustang driveshaft will work, others have done this swap in v8s and haven't mentioned having to get a custom driveshaft made.
They did mention using a 6r80 from an f150 in a mustang requires a simple custom bracket to hold the shifter cable, the mustang trans comes with the bracket but the f150 doesn't. Looks like the trans mount is the same between f150 and mustang, all electrical connections are the same. There's a code on the side of the trans that must be loaded in to the PCM in order for it to work properly.
Your auto choices for an ecoboost are
3.7 mustang 6r80
3.7 4x2 f150 6r80
3.5 4x2 f150 6r80
The 4x4 trans won't work, it's got a different output shaft. The v8 trans has a different bolt patter and will not work either. The 6r80 has less clutches in the 3.7 in both the mustang and f150, the 3.5 f150 auto has the same amount of clutches as the 5.0 & 6.2 in the f150. The mustang v8 6r80 has one additional separator plate over any of the f150 transmissions. 6r80 stands for 6 speed, RWD, 800 lbs of torque. The short version is make sure to get a 3.5 ecoboost f150 auto, just a little bit more expensive to buy used but probably worth the extra strength. I found a 17k mile transmission for $675, not bad.
Transbrake for the 6r80 is done electronically and only requires a plug in module, pretty cool. $200 for that.
Stall converters are available for the 6r80 but I don't see how it's really going to help, I think I'm going to run the stock unit and save the $1,100 for something else. The ecoboost makes good torque numbers at 1700 rpm and peak torque for modified ecoboost around 2500 rpm. The factory stall converter runs 2300-2600 rpm so that should work out pretty well. Since the car is lighter that rpm may come sooner but it's also making more torque than stock which I've read pushes the rpm a little higher before engaging.
I think a 3.7 mustang driveshaft will work, others have done this swap in v8s and haven't mentioned having to get a custom driveshaft made.
They did mention using a 6r80 from an f150 in a mustang requires a simple custom bracket to hold the shifter cable, the mustang trans comes with the bracket but the f150 doesn't. Looks like the trans mount is the same between f150 and mustang, all electrical connections are the same. There's a code on the side of the trans that must be loaded in to the PCM in order for it to work properly.
Dude, I don't care what you do, screw things up, get things together, make mistakes, even blow stuff up, etc. What you are doing is one of the most impressive projects I've seen anyone do online, I love it.
I look forward every day to seeing an update pop up on my User CP when I come here.
Its an amazing project.
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Joined: July 10, 2015
Posts: 1,102
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From: Boulder
Thread Starter
Cobra Member
Joined: July 10, 2015
Posts: 1,102
Likes: 57
From: Boulder
Dude, I don't care what you do, screw things up, get things together, make mistakes, even blow stuff up, etc. What you are doing is one of the most impressive projects I've seen anyone do online, I love it.
I look forward every day to seeing an update pop up on my User CP when I come here.
Its an amazing project.
I look forward every day to seeing an update pop up on my User CP when I come here.
Its an amazing project.
Btw I also started welding in the cage this weekend, figured out I was missing a box that somehow fedex lost in Ohio. Hopefully I get that straightened out soon.
Member
Joined: January 28, 2016
Posts: 19
Likes: 0
From: Drouin Australia
Since I've never had a performance car with an auto I had to do some homework, here's what I learned.
Transbrake for the 6r80 is done electronically and only requires a plug in module, pretty cool. $200 for that.
Stall converters are available for the 6r80 but I don't see how it's really going to help, I think I'm going to run the stock unit and save the $1,100 for something else. The ecoboost makes good torque numbers at 1700 rpm and peak torque for modified ecoboost around 2500 rpm. The factory stall converter runs 2300-2600 rpm so that should work out pretty well. Since the car is lighter that rpm may come sooner but it's also making more torque than stock which I've read pushes the rpm a little higher before engaging.
Transbrake for the 6r80 is done electronically and only requires a plug in module, pretty cool. $200 for that.
Stall converters are available for the 6r80 but I don't see how it's really going to help, I think I'm going to run the stock unit and save the $1,100 for something else. The ecoboost makes good torque numbers at 1700 rpm and peak torque for modified ecoboost around 2500 rpm. The factory stall converter runs 2300-2600 rpm so that should work out pretty well. Since the car is lighter that rpm may come sooner but it's also making more torque than stock which I've read pushes the rpm a little higher before engaging.
You may need to spend some money on the converter anyway as they have a really bad design in the thrust bearings and fail in a very messy way. There is a bronze thrust on one side of the stator that gets overloaded. When it wears down the needle roller on the other side of the stator gets pounded to death. Result is a lot of metal through your trans. The aftermarket converters I found in a previous post overcome this problem by using real bearings (none of this bronze thrust crap).
We've seen this a lot in Oz - the 6R80 is used in a light pickup (well, it is light by US standards, over here it is quite large
) and I've torn down many 6R80's to clean them out following a converter failure. 
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Joined: January 28, 2016
Posts: 19
Likes: 0
From: Drouin Australia
Mustang paddle shifters
Paddle Shift Kit 2013 2014 Ford Mustang Select Shift Automatic Trans Shifter | eBay
Paddle Shift Kit 2013 2014 Ford Mustang Select Shift Automatic Trans Shifter | eBay
So the switches talk to the box wirelessly? Tell whoever designed this that I want to have his babies.
With a different mount this could fit any steering wheel and no need to much around with clock springs or the like.
Now, all I need is for Trump to win and the resulting improvement to the exchange rate will make it possible for me to buy them without consulting the Minister for Finance (the wife).
