3.9 spare for my Dakota

General Discussion

  1. FU64RY

    FU64RY Well-Known Member

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    Spent two days in the local yard getting this puppy out.
    PITA but well worth it.
    3.9 and tranny for $349.
    Showed 151K on the odometer and recent trans service at 136K.
    Just did a comp test 180-182 on all 6.

    IMG_1217.JPG IMG_1218.JPG
     
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    • Don Frelier

      Don Frelier FBBO Gold Member FBBO Gold Member

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      Looks like you got a good one.
      Too bad I scrapped mine a few years back. No-one was interested in it.
      I would probably put a new timing chain on it. If you get the newer one from mopar it has a tensioner built into it.
      Re-seal the intake would be a good idea as well. That's definately a design weak point on those.
      Those exhuast manifolds look pretty clean.
       
    • toolmanmike

      toolmanmike Moderator Staff Member FBBO Gold Member

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      Looks like a goodie. Check the timing chain before you use it but that's much easier to do out of the vehicle. Those are good mills. I have 2 96 Dakota's with 3.9's 300,000 miles between the two.
       
    • yella71

      yella71 Well-Known Member

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      too bad it wasnt a hemi.....
       
    • Slap Stick

      Slap Stick FBBO Gold Member FBBO Gold Member

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      Re the intake. Get the intake plenum kit from Hughes and never have to fix it again.
      +1 on the chain.
      What model year engine is it? Later models eliminated the egr and return fuel line.
       
    • YY1

      YY1 Well-Known Member

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      If I still had a a 3.9 Dak and suspected an impending failure, I believe I'd consider a 5.2 transplant.

      Almost 100 HP gain and only 2 MPG loss.
       
    • Don Frelier

      Don Frelier FBBO Gold Member FBBO Gold Member

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      That's what I did, but it was probably more like 4-5 MPG. I also put in a 46rh. Very happy with it.
       
    • YY1

      YY1 Well-Known Member

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      We've had 8 Dakotas in our family.
      (plus 2 Daks and 3 Durango's in the extended family)

      The 3.9's get 18
      The 5.2's get 16
      The 5.9's get 13.5
       
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      • toolmanmike

        toolmanmike Moderator Staff Member FBBO Gold Member

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        Yes sir! My 4 wheel 96 3.9 get's 18 hwy. My 2wd 96 3.9 gets 22.
         
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        • Slap Stick

          Slap Stick FBBO Gold Member FBBO Gold Member

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          I had a 92 3.9 and i got 23mpg out of it on a trip to VA-on the way there the fuel pump went tango uniform.
          I now have a 92 extended cab with the 318. It got 18mpg on the same trip.

          The 92-up 239 made 180hp compared to the 318s 230.
           
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          • YY1

            YY1 Well-Known Member

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            Whoa, what kinda 100MPG JC Whitney EFI do you have?

            NEVER seen 22 average MPG on any.
             
          • YY1

            YY1 Well-Known Member

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            50 is almost 100, right?
             
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            • BeatersRus

              BeatersRus FBBO Gold Member FBBO Gold Member

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              im looking for as many of the 2 wheel drive v6 5 speed transmissions as you can find.
              trans,pedals,and flywheels too.
              mentioning this because you are local.

              nice snag @ fu64ry
               
            • FU64RY

              FU64RY Well-Known Member

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              95, my truck is a 94 with 181K and still, Nock on wood: good. Thanks for the advice, I was also told to change the oil pump and timing chain.
               
              Last edited: Nov 22, 2020
            • satilite73

              satilite73 Active Member

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              I've got a '93 extended cab LE with the 3.9 auto. I'm more worried about the electrics holding up than the engine. New computers look to be in limited supply already, how's it gonna be in another 10?

              I'm having an issue with the IAC on mine right now. The original one definately quit, so I bought a replacement from local parts house. The replacement is adjustable, where as the factory one was not. I get it to start, then it won't idle. I get it to idle, then its a PIA to start. I just want to be able to jump in my truck and GO without fuss as I did before. Is this too much to ask?

              I did the intake upgrade and new chain and tensioner when I bought my truck almost 5 yrs ago. Neither are hard to do, just gotta take your time.

              As an aside, almost 100% of my driving is in town, and my truck averages no less than 14, sometimes a little higher. Combined it will get close to 16 and on the one trip I took with it where I was able to use the cruise, it got 20, almost 21. I previously had an '02 RAM 1500 (first year for that body style) with the 4.7, and no matter what I did, how I drove, etc, etc, that sucker NEVER got above 14 but could easily get lower mileage.
               
            • YY1

              YY1 Well-Known Member

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              IAC is a somewhat common issue however, they're either good or not good.

              Buy OEM or take a chance on a u-pull OEM.

              Better option than aftermarket on that part.

              Worst thing besides hit or miss transmission issues (mine.s still good and still has the factory fluid) on any of ours has been water pump/radiator/heater core.
              Mine's on the 5th water pump and 3rd radiator, but all in all at 175,000 those are easy repairs considering what could go wrong/does go wrong with other trucks of that era.
               
            • Slap Stick

              Slap Stick FBBO Gold Member FBBO Gold Member

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              One other thing to replace....well, two.
              The oil pump intermediate shaft and bushing.
              They get worn and the engine will lope at idle in gear. On the highway the fuel synch moves around, especially with a worn timing set. With the cruise set the engine will start missing and the cruise will disengage. The OD may even turn off.
               
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