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Matt
Dodge Dakota
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4/05/2009
23:36:41
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 Subject: 3.9L to a V-8 in a 2000?
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Wondering if this can be done in a 2000 Dakota 4x4 and if and what would need to be changed?
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SxtJDK03
GenIII
4/06/2009
11:58:48
|  RE: 3.9L to a V-8 in a 2000?
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All depends, do you have manual or auto tranny? That will make a difference on the PCM swap that you will have to do. If you go to a 5.2 liter you wont have to do the engine wiring harness swap but if you do a 4.7 you will. Just depends on what V-8 you decide to go with.
Wheel 'til it breaks!
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whippy89
Dodge Dakota
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4/06/2009
14:26:27
| RE: 3.9L to a V-8 in a 2000?
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Hey I'm trying the same swap on a 99 dakota 2wd. 3.9 to 5.2. I have a manual transmission and a question. Are the 5-speed trannys for the 3.9 and 5.2 the same? From what I've read the bolt pattern is but are the tranny's the same. It's hard to find the info. please help me too.
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SxtJDK03
GenIII
4/06/2009
17:16:53
| RE: 3.9L to a V-8 in a 2000?
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Yes, the tranny will mount up perfectly and will be plenty strong. They use the same transmissions in the ram 1500s with the 5.2 as well. It is an NV3500 tranny. If you have the tow package from the factory you will have the NV3500HD which is a little beefier for towing and whatnot.
Wheel 'til it breaks!
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.
Dodge Dakota
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4/06/2009
21:23:07
| RE: 3.9L to a V-8 in a 2000?
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.
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whippy89
Dodge Dakota
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4/07/2009
00:49:11
| RE: 3.9L to a V-8 in a 2000?
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So the wiring harness will be the same too? Will I need to get new motor mounts for it? Where'd Matt go? He started this thread and hasn't asked anything since. Sxt, thank you for the information so far. And Matt the only thing I know on the swap is that you'll probably want the bigger radiator for a v-8. This is kind of cool though. Sxt if what you're saying is true it's actually a pretty straight forward swap. Man, I cant wait to smoke the tires. Neither can my truck. Anyone else talk to their vehicle? Is that a weird thing?
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SxtJDK03
GenIII
4/07/2009
10:41:30
| RE: 3.9L to a V-8 in a 2000?
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The wiring harness will be the same with the exception of the injectors. You will have to add in the extra 2 injector plugs to make your harness compatible with the v8 instead of v6. Other than that its pretty straight forward. I have done the 3.9 to 4.7 swap in mine, mainly because I found a free 4.7 on craigslist with 72k on the motor, couldn't really pass that up. That and since my truck is an 03 it also came with the 4.7 and wasn't availible with the 5.2. Made it a pretty simple deal.
You should be able to switch your components up front as well, as far as alternator, power steering pump and ac compressor goes. those should all be the same for you. Its really pretty nice to have a purpose for that 5th gear :) Especially now that Im going to have 37s under my truck it will make it actually move!
Wheel 'til it breaks!
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Matt
Dodge Dakota
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4/07/2009
22:02:59
| RE: 3.9L to a V-8 in a 2000?
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Well, the truck is an automatic. It sounds as if this can be done, so I'm just really curious to know everything that im going to need to swap over. The truck is a 4x4 and has a 3in lift, none of which i think will have any bearing on what i would like to do. If someone could lay out exactly the things i need to switch over i would really appreciate it. I was also wondering if anyone know what the earliest year truck i can pull a 3.9 out of if i cant find the 5.2 to swap. Any idea?
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Matt
Dodge Dakota
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4/07/2009
22:05:13
| RE: 3.9L to a V-8 in a 2000?
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I guess i also need to know what the earliest yr motor i can throw in the truck. Both 3.9 and for the 5.2
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whippy89
Dodge Dakota
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4/08/2009
02:15:32
| RE: 3.9L to a V-8 in a 2000?
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Matt you can find a 5.2l for next to nothing. Mine was 75 bucks not running, but in my case it didn't need to be. Local junkyards 4-600 running. I prefer craigslist. $30-50 bucks for a one day hoist rental if you don't have one. 5.2l probably $2-300 running, with the wiring harness and ecu if its a truck getting parted out. There have been a bunch of 5.2l part outs around Chicago lately. Hell why not take the motor mounts and radiator with it. If you get the engine from someone its cool too. You can take your time pulling it. Go there one day for the radiator, computer, loosen motor mounts disconnect fuel lines etc. Then go back in a day or two to simply pull it out and disconnect tranny. The only other things you might need are a driveshaft and some 1-2ft pieces of brake/fuel line. I think that the transmission will still be in the same spot though and the fuel lines might just hook up. A 2000 3.9l and 4.7l use the same driveshaft, but there wasn't anything listed for the 5.2l Oh yah and don't forget the beer. After enough of them your friends seem to do a lot of the work for you or at least they'll keep you company. Just a thought. Sxt probably would know better though.
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whippy89
Dodge Dakota
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4/08/2009
02:33:15
| RE: 3.9L to a V-8 in a 2000?
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That's it I cant wait any longer I'm going to find a running v-8 to throw in for a while. And Matt you can use any 3.9l magnum in there. The blocks are the same.
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dakownr
Dodge Dakota
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4/11/2009
02:11:27
| RE: 3.9L to a V-8 in a 2000?
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Matt and Whippy: some things to keep in mind for this swap (on top of the sound advice mentioned above)-
You CAN use ANY 3.9 or 5.2 MAGNUM engines for your trucks. However, if you get the engines out of a ram, you will need to change the oil pan and the pick-up tube for the oil pump so that the engine will fit in your truck. I have heard that going from a 3.9/5.2 to a 4.7 caused ALOT of headaches for a couple people (not entirely sure why, but sticking with the 3.9/5.2 will guarantee compatibility).
Since you guys have post-'96 trucks, it would be easiest to get engines that are also from '96 on. If you do get a pre-'96 motor, you will have to switch some things around to work with your computer. You will need to get a non-egr '96-up exhaust manifold (driver's side, I think). You may have to re-use some sensors and whatnot from your original engine, because I think that the plugs on your trucks may not work with some of the older sensors (not 100% about that one, though). The throttle body brackets (for throttle and tranny cables) connect differently on some of the older trucks, so you may have to purchase a compatible throttle body, or do some minor fab work to make your cables work with it.
Also, if the donor truck had a manual trans and yours has an auto, remember to remove the pilot bearing and it's bushing out of the rear of the crankshaft. Or vice-versa, for you Whippy.
None of what I just mentioned is really hard or even very time-consuming, so don't think that I'm saying it would be too big of a pain to get a truck from a Ram or a pre-'96 dak swapped in. I swapped a pre-'96 motor from a manual trans Ram into my '96 auto dak last year, and these are issues that popped up as I installed the engine. Like I said these aren't major probs, just things to be aware of. Hope all this helps.
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whippy89
Dodge Dakota
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4/12/2009
02:06:30
| RE: 3.9L to a V-8 in a 2000?
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Hey I was at the auto parts store yesterday looking more into the swap. Motor and trans mounts on 3.9l and 5.2 are different. I can understand diff combo, different mounts. Am I going to have to get a different driveshaft too, and cut my floor back for the shifter?
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well
Dodge Dakota
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4/12/2009
18:29:01
| RE: 3.9L to a V-8 in a 2000?
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for what it's worth
want more indepth help
go ask for Larry on the v6 board
he has done many v6 to v8 swaps
and most likely
is the one that can answer all your questions
(he owns a garage J&J auto)
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