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89 Dodge Dakota engine swap

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  #1  
Old 01-22-2018, 05:59 PM
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tisa1926
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Question 89 Dodge Dakota engine swap

I own a 1989 Dodge Dakota Sport Convertible 4x4 with auto transmission with no A/C. I currently have more than 150k miles on her and I get about 16 miles per gallon. My question is; Does a 5.2 / 318 engine swap out with the 3.9V6? Are there any modifications needed that I should be aware of? Will all the parts bolt on? Is there much power difference? Is the gas mileage better or worse?
Thanks guys for any info.
 
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Old 01-22-2018, 07:14 PM
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Moved to the correct section.
 
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Old 01-22-2018, 07:23 PM
Toby Warford
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Originally Posted by tisa1926 View Post
I own a 1989 Dodge Dakota Sport Convertible 4x4 with auto transmission with no A/C. I currently have more than 150k miles on her and I get about 16 miles per gallon. My question is; Does a 5.2 / 318 engine swap out with the 3.9V6? Are there any modifications needed that I should be aware of? Will all the parts bolt on? Is there much power difference? Is the gas mileage better or worse?
Thanks guys for any info.
You'll need electric fan(s). Everything else will swap in. Itd be advised to switch transmissions too. It'll swap right in. You'll want a carb fed magnum unles you want to do a lot of wiring. And if you're going to do it, get a 5.9 360. No reason not too. Mileage may or may not change. Depends on condition of your engine, the new engine and your driving habits. Could go up, could stay the same, could go down. Hard to tell. Too many variables.
 
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Old 01-22-2018, 10:23 PM
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Originally Posted by Toby Warford View Post
You'll need electric fan(s). Everything else will swap in. Itd be advised to switch transmissions too. It'll swap right in. You'll want a carb fed magnum unles you want to do a lot of wiring. And if you're going to do it, get a 5.9 360. No reason not too. Mileage may or may not change. Depends on condition of your engine, the new engine and your driving habits. Could go up, could stay the same, could go down. Hard to tell. Too many variables.
Like Toby suggested I swapped a carbed magnum into my 90 vert. There are several considerarions:

You will need a serpentine water pump set up on a magnum. I went with an LA style water pump and had to swap the front end with a 94 to fit inside the radiator. A serpentine setup has a shorter pump snout and it will just fit inside the radiator. But you'll need electric pusher fans as Toby noted.

Your 89 has a 42rh transmission. It will not last behind a v8. Be prepared to swap to a 46rh trnasmission.

If you go with a 360 be aware that the 318 and v6 are internally balanced engines while the 360 is externally balanced. That means either a flex plate change with weights and a neutral balanced converter or a custom converter with weights and a neutral flex plate.

I'd you search my ID I have a long build thread and several smaller threads dealing with various issues on this swap. It was quite the learning process but I could do it in my sleep now. The devil is in the small details.
 
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Old 01-23-2018, 07:40 AM
93 ragtop
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There are 2 members on here, who I would research and read their threads. They have actually done the conversion you are talking about and have detailed it for the rest of us.
They are robertmee and ragged89.
Just a hint. Putting a V-8 in a 87-90 is completely different then putting a V8 in a 91 up. The 91 is basically a simple swap..... The 91 and up was designed for a V8.
The 87-90 was not.....
And yes, Shelby put a V8 in a early dakota, but again, the truck was not designed for it. It required fans in front of the radiator, and he used a custom crossmember for the motor....
Also, keep in mind 4wd and 2wd dakota's are different trucks, different motor mounts, different steering systems, etc.

The two members above I referenced, both have conv. trucks, but they are different.
Listed below are some of the details and differences in the trucks along with a few links to get you started.

Robertmee, has a 2wd, automatic, 5.9 magnum converted to a carburetor, and using a V-belt accessory system.
Here are a few links to his build.
https://dodgeforum.com/forum/1st-gen...gine-swap.html
https://dodgeforum.com/forum/1st-gen...estions-4.html

Ragged89 has a 4wd, 5spd. 5.2 magnum with factory EFI
Here is a link to his build.
https://dodgeforum.com/forum/1st-gen...le-dakota.html


FWIW I have a 87 4wd 5spd truck. I plan to put a stock, (for now) 5.9 carbed magnum, with a serpentine belt system. It will kinda be a combination of the 2 above trucks.
I have already upgraded the transmission from a NV2500 to a NV3500, have added a external electric fuel pump, (87 was mechanical) and have swapped rearends.
My next steps are to set up a underhood fuse and relay panel for the fans, fuel pump, etc. and of course the fans.
I want to keep AC and neither of them have.... so that will be differernt.

Two important things that you need to consider before starting this conversion
1. Do you have other transportation, and are you prepared for the truck to be down for awhile?
2. Do you have emissions requirements?


Good luck!! and BTW, welcome to the forum!!
 
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Old 01-23-2018, 11:20 AM
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Wink 1989 Dodge Dakota Engine swap

Thank you everyone for such a quick response. You have given me a lot to think about. I plan to replace the engine with a crate so I just have to decide which one.

Thanks again
 
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