3.8L to 4.6L swap info - Mustang Evolution

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Old 07-18-2011, 12:38 PM   #1
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3.8L to 4.6L swap info

So I just recently bought a couple cars off a guy for real cheap. The first one is a 1995 mustang LX with a 3.8L that's shot. The other car is a 1996 GT that got t-boned so everything in the Drivetrain is fine but the frame is bent. I'm wanting to throw the 4.6 in the LX body. Any tips on what I all need to do? Am I going to be able to just swap the engine harness/ECM or am going to have to pull the whole body harness? It's just a project car so time spent on it isn't an issue i'd just like to know a bit better about what I've gotten myself into! Any help would be greatly appreciated!
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Old 07-19-2011, 06:29 PM   #2
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Ok...you'll need the k member, engine, trans, engine ECM...harness...possibly fuel pump..but
Look into that first...
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Old 07-19-2011, 07:02 PM   #3
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Sounds like an awesome project i wish i could do myself lol. But fuel pumps shoul be same but not sure. But yea kmember engine tranny engine harness.
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Old 07-19-2011, 07:16 PM   #4
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Ok. But I should be safe from having to pull the body harness right?
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Old 07-19-2011, 07:17 PM   #5
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Yea you shouldnt need the whole body harness. Its pretty much the same.
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Old 07-19-2011, 07:54 PM   #6
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That's what I was really hoping for! I'm starting the second powertrain removal tonight!!
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Old 07-20-2011, 09:28 AM   #7
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Re: 3.8L to 4.6L swap info

its always the little things that add up the cost and take the most time
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Old 07-20-2011, 06:54 PM   #8
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Re: 3.8L to 4.6L swap info

The wiring, ECU and k-member are the biggest things..if you have them (and it sounds like you do), then you should have no major problems. I'd also throw the 8.8" rear in the 95 to...the 7.5" is smaller and weaker, and doesn't come with a traction lok. If the GT had a ton of miles it might be worth it to get a rebuild kit for the differential...maybe some taller gears if the budget/time allows.

I'm not sure if the 94-98 GT's had quad shocks, but if they do you'll want to take them off the donor car and put them on the 95 as well. The mounting holes should be on the car if the quad shocks were available.
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Old 07-21-2011, 01:27 AM   #9
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Ok perfect. I definitely have all I need. I plan on switching out all the suspension parts front and back as well. Along with putting leather in the interior! So I shouldn't have to swap out the gauges or anything like that?
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Old 07-21-2011, 01:33 AM   #10
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I wish I could do that project man. Sounds like it's gonna be fun
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Old 07-21-2011, 01:45 AM   #11
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It definitely teaches you a lot! I've only ever done one other motor before and that was in a dodge truck not a car. And not a completely different motor. It should be good tho. The 4.6 will be a lot better than that little 3.8!!
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Old 07-21-2011, 09:35 PM   #12
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Re: 3.8L to 4.6L swap info

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Originally Posted by zrider07 View Post
Ok perfect. I definitely have all I need. I plan on switching out all the suspension parts front and back as well. Along with putting leather in the interior! So I shouldn't have to swap out the gauges or anything like that?
Are you upgrading suspension or keeping stock...most of the suspension components ~ springs, shocks/struts were the same between the v6's and GT's...about the only difference were the quad shocks (if equipped on the 94-98's) and the rear sway bars. I believe some of the 94-96 v6's came with a rear sway bar from the factory. I'm not sure if the GT's was thicker though...may want to check into that.
I only ask about the the suspension because if you were staying with stock, if the components on the v6 car are decent, you could stick with those and save the time of swapping them out.

If you're going from a v6 to the v8 I would swap the gauge cluster. That gauge cluster should be tied to that engine/ECM anyways...plus 150 always looks better than 120
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Old 07-21-2011, 09:45 PM   #13
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Ok thanks! I'll look into the suspension. And I guess that means tearing half the dash apart for the cluster?
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Old 07-22-2011, 11:20 PM   #14
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Re: 3.8L to 4.6L swap info

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Ok thanks! I'll look into the suspension. And I guess that means tearing half the dash apart for the cluster?
It's not bad...like 4 torx bolts to remove the gage cover piece, and another handful to remove the actual cluster...then it's just switches to unplug...at least that's how it was on mine...yours might be slightly different since the 94-98's weren't electronic, hell it might be easier.
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Old 07-23-2011, 12:27 AM   #15
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Ya it was actually really easy! I pulled the gauges and the wiring plugged right in. It doesn't look like I'll have to change the actual cluster.
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