Swapping a 5.0 or 5.4 or 5.8 into a previously 3.7 car - Mustang Evolution

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Old 02-25-2015, 05:59 AM   #1
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Swapping a 5.0 or 5.4 or 5.8 into a previously 3.7 car

I'm just curious I'm looking at turboing my 3;7 but when I look and 5.4 engines on eBay they are about 8 grand to 11. But you get 600+ horsepower while paying the insurance of my 3.7. I'm not gonna pull a new engine while still under warranty but just really curious about the possibility? And I'm sure the engine would fit since it does already fit in the gt500 but what I'm wondering is could a 5.4 engine be mated up to the 6R80 transmission? Now look I would love to drive an manual tranny car again but since I broke my back racing, the auto is the only way I can role. and since I'm not super informed about weather an engine made to be mounted up to a manual transmission would connect to the auto transmission that's why I ask you all. Please give me your opinion and expertise


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Old 02-25-2015, 06:16 AM   #2
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I know this very topic has been covered in here prior and if my memory serves me correctly. The general consensus was, it costs to much to do a swap and not worth it. Cheaper to turbo the car
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Old 02-25-2015, 06:32 AM   #3
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Goodbye Fellow V6-ers - Engine - FastFordMuscle.com


here's a 351w swap
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Old 02-25-2015, 09:17 AM   #4
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Transmission wont fit, driveshaft is different, rear pinion flange is different, suspension and brakes will all need to be changed to handle the new weight / power, you'll need the ECU, your stock fuel system wont be up to snuff ... it very quickly turns into a LOT more than you were initially expecting.
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Old 02-25-2015, 09:55 AM   #5
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If you have a donor gt car, my understanding is that everything will swap over

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Old 02-25-2015, 10:21 AM   #6
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Waste of money to swap.
If you really want one, sell your car and buy it. And if anything happens, insurance won't cover it (for most ins companies)

A 6r80 from a 5.0 will bolt up to the 5.4 or 5.8, but you'll need a custom length driveshaft, and a lot of other components.

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Old 02-25-2015, 11:19 AM   #7
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No 5.4 or 5.8 ever came auto did they ... you wouldnt even be able to tune the thing with a 6r80, the ECU wouldnt know what to do with it ...
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Old 02-25-2015, 11:49 AM   #8
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No 5.4 or 5.8 ever came auto did they ... you wouldnt even be able to tune the thing with a 6r80, the ECU wouldnt know what to do with it ...
I forgot who, but someone was able to do it. I'm sure it wasn't fun wiring it.
Probably some standalone harness

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---------- Post added at 11:49 AM ---------- Previous post was at 11:49 AM ----------

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Old 02-25-2015, 11:50 AM   #9
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Ofc for that kind of money, I'd just get a straight cut t56....

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Old 02-25-2015, 12:34 PM   #10
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Sell the car and buy a 5.0

The 5.4 is also a boat anchor, you WILL notice a difference in front end weight, it's a torque monster engine but it's heavy, especially if it's a pre-2011 GT500 5.4, then it'll be an iron block. You'll be adding damn near 150-200 pounds to the front end.


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Old 02-25-2015, 03:48 PM   #11
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The only engine swaps that should ever happen with a Mustang are either a Mustang spec coyote or an LSx. Everything else is a waste.

Unless of course you have a 4.6 NA Mustang ... then a Briggs and Stratton would be a good cheap alternative while making more power...
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Old 02-25-2015, 04:05 PM   #12
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Unless of course you have a 4.6 NA Mustang ... then a Briggs and Stratton would be a good cheap alternative while making more power...

Didn't know what that was at first but started laughing when I looked it up.


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Old 02-25-2015, 04:13 PM   #13
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lol i had one in my gokart ... they make all kinds of cams, flywheels, pistons, everything for those motors. I've seen 25 hp from what started life as a simple briggs and straton 5 hp lawn engine. The Honda GS200 engines are THE go-to engine for small karts but ... thats enough threadjack for now lol before i get all excited and want to rebuild my go kart.
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Old 02-25-2015, 04:43 PM   #14
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Didn't know what that was at first but started laughing when I looked it up.


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Haha .. I thought everyone on earth knew what a Briggs and Stratton was. I suppose that's the ignorance of growing up in rural Indiana...

To further derail this thread, Voltwings, I never saw anyone build anything with a Honda engine. We always ran the Rotax 125's and Yamaha Kt100's. Both were awesome little engines. We ended building a shifter kart with a CR250R engine. Hairy balls that thing was wicked fast. We never raced it but just drove it into town and messed with the police on it. Selling it (to pay for college) was one of my biggest regrets. My friends and I have discussed swapping a newer 450cc four stroke MX engine onto a good chassis. We just haven't done it yet.
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Old 02-25-2015, 05:26 PM   #15
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Old 02-25-2015, 06:06 PM   #16
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5 grand for a procharger will be way less than the swap. 400rwhp is enough to get you in some trouble.
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Old 02-25-2015, 07:14 PM   #17
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Haha .. I thought everyone on earth knew what a Briggs and Stratton was. I suppose that's the ignorance of growing up in rural Indiana...



To further derail this thread, Voltwings, I never saw anyone build anything with a Honda engine. We always ran the Rotax 125's and Yamaha Kt100's. Both were awesome little engines. We ended building a shifter kart with a CR250R engine. Hairy balls that thing was wicked fast. We never raced it but just drove it into town and messed with the police on it. Selling it (to pay for college) was one of my biggest regrets. My friends and I have discussed swapping a newer 450cc four stroke MX engine onto a good chassis. We just haven't done it yet.

I'm a 20 year old in the burbs of California lol


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Old 02-25-2015, 07:15 PM   #18
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5 grand for a procharger will be way less than the swap. 400rwhp is enough to get you in some trouble.

255whp is enough to get in trouble.... Trust me I know lol


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Old 02-25-2015, 08:17 PM   #19
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255whp is enough to get in trouble.... Trust me I know lol


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255 whp is enough to maybe get a ticket. 400+ rwhp will likely result in handcuffs and a jail sentence.
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Old 02-25-2015, 08:19 PM   #20
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255 whp is enough to maybe get a ticket. 400+ rwhp will likely result in handcuffs and a jail sentence.
Depends on what the ticket is for. Speed yea 400+ is more likely. Mine were for more lack of traction and not being in a straight line while leaving a parking lot... If you get what i mean lol
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