Engine Swap
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From: Lebanon, MO
Engine Swap
When the time comes I want to swap both motor and tranny from 1991 351w e40d (speed density) to 1995 302 4r70w (mass air).
What is the best way to do this? I have both trucks and they both run well. The 1995 has 200K so I want to be ready when the time comes.
What is the best way to do this? I have both trucks and they both run well. The 1995 has 200K so I want to be ready when the time comes.
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Freshman User
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From: Lebanon, MO
Swap motor and tranny from 1991 351w (speed density) e40d to 1995 302 (mass) 4r70w
Thanks for your response. I have been reading and have learned so much. Still have a long way to go tho. The way I understand my problem is that the only problem that I am really going to have with the swap is the speed density to mass air problem. This will mostly take care of itself since the 1995 f150 that I am going to with the 351w is already set up for mass air. So, all I have to do is make sure that I am using the right intake. Is this correct?
FTE Legend
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From: Ottawa, Ontario
Your swap is rather easy actually, you don't have to touch the wiring harness or computer just remove the 5.0 and install the complete 5.8 where it was. The 5.0 and 5.8 intakes cannot be interchanged they're different so all you have to change is the flexplate and exhaust system. Do not use the flexplate currently on the 5.8 or the 5.0, you need a new AOD/4R70W flexplate since the 5.8 requires a 28oz flexplate while the 5.0 uses a 50oz and the E40D flexplate has a different offset. The 5.8 motor is also wider than the 5.0 so the y pipe will have to be widened or you could use the 5.8 version you have.
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I am glad to hear from you. I have read many of your other postings and you really seem to have the engine swap down.
(1) So, I will need to pick up an intake for the 5.8 and that should finish of the mass air problem.
(2) The exhaust will not fit. I guess I can use the exhaust manifolds off of the 5.8 and run new pipe.
(3) Lastly, if I am also transferring in the e40d with the 5.8 to replace the 5.0 with the 4r70w then why do I need to change the flexplate. I was going to move both the engine and tranny as one unit.
(1) So, I will need to pick up an intake for the 5.8 and that should finish of the mass air problem.
(2) The exhaust will not fit. I guess I can use the exhaust manifolds off of the 5.8 and run new pipe.
(3) Lastly, if I am also transferring in the e40d with the 5.8 to replace the 5.0 with the 4r70w then why do I need to change the flexplate. I was going to move both the engine and tranny as one unit.
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OH.. you're moving the tranny too... how did I miss that? That changes everything and takes this from relatively simple to very complicated. In that case you cannot retain mass air with the existing parts you have on-hand because you have to use the complete powertrain wiring harness and computer from the '91, nothing from the '95 is compatable. If you really want mass air you'll have to find an E4OD mass air computer.
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Swap motor and tranny from 1991 351w (speed density) e40d to 1995 302 (mass) 4r70w
Ok, I was afraid of that. I don't care about mass air. Speed density is fine with me. Could I move the 91 computer and wiring harness without much trouble over to the 1995 or would I run into problems with splicing harnesses or cruise control, etc. I don't want this project to get over my head.
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Swap motor and tranny from 1991 351w (speed density) e40d to 1995 302 (mass) 4r70w
Swap motor and tranny from 1991 351w (speed density) e40d to 1995 302 (mass) 4r70w
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Ok, I was afraid of that. I don't care about mass air. Speed density is fine with me. Could I move the 91 computer and wiring harness without much trouble over to the 1995 or would I run into problems with splicing harnesses or cruise control, etc. I don't want this project to get over my head.
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OH.. you're moving the tranny too... how did I miss that? That changes everything and takes this from relatively simple to very complicated. In that case you cannot retain mass air with the existing parts you have on-hand because you have to use the complete powertrain wiring harness and computer from the '91, nothing from the '95 is compatable. If you really want mass air you'll have to find an E4OD mass air computer.
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There will be some splicing with the harness swap for power and ground and the dash gauges to name a few things, this can't be avoided. The 4R70w is a capable tranny I'd be more inclined to have it overhauled if it's tired or just install a shift kit and run it with the 351 if it's still healthy.
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There will be some splicing with the harness swap for power and ground and the dash gauges to name a few things, this can't be avoided. The 4R70w is a capable tranny I'd be more inclined to have it overhauled if it's tired or just install a shift kit and run it with the 351 if it's still healthy.
So where does that leave me?
(1) I will need a new intake for the 5.8, because it is not a mass air intake that is on it and the one of the 5.0 will not work.
(2) The exhaust will not work. I can use the manifolds from the 5.8 but will probably have a problem with the Y pipe.
(3) Neither one of the flexplates that I have will be the correct one, so I will need to pick up one that is for the 5.8 and 4r70w combo.
(4) I can use the harness and computer that is in the 95 with modification.
Does this all sound right?
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No harness modifications necessary at all, just plug in the 5.8 where the 5.0 was.
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Well, all in all I would agree with your original statement that this method would be much more straightforward. I will see what I can get out of the e40d and rebuild the 4r70w. I wasn't sure if the intake that is currently on the 5.8 would work when moving to mass air. I will pick up a new flexplate. I can use the exhaust manifolds and the y pipe may fit as well since they are both extended cabs. The 1991 just has a little longer bed, so we'll see what happens with all that. Lastly, I really like the idea of not trying to rewire the harness or move the eec. I have learned a lot about several things from this project and I really appreciate your advice. Thanks a million.
Fleet Mechanic
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I am with Conanski on swapping out the 302 for the 351 and just attaching everything the 302 had to the 351. The 4R70W is way easier to rebuild yourself compared to the E4OD (also the books showing how to rebuild the AOD can be used as a guide for the drivetrain but not the valve body). Plus the headache of finding a crown vic AOD flex plate for the 351 is just a parts house ordeal.
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